//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27718 SUBJECT: Insight-HXMT's continued observation plan for SGR J1935+2154 DATE: 20/05/12 08:53:10 GMT FROM: Shaolin Xiong at IHEP S.-N. Zhang, X.-B. Li, C.-K. Li, M.-Y. Ge, S.-L. Xiong, S.-M. Jia, J.-Y. Nie, H.-S. Zhao, C.-Z. Liu, Y. Chen, X.-L. Cao, Y.-P. Xu, F.-J. Lu, L.-M. Song (IHEP), T.-P. Li (THU/IHEP), on behalf of the Insight-HXMT team: Since 2020-04-28 07:14:51 UTC, Insight/HXMT has been observing SGR J1935+2154 under a public ToO. The current plan is to continue this public ToO until the end of May. An extended observation after May is probable if this SGR is still in active phase. Joint observations with Insight-HXMT are highly encouraged. The observation plan of Insight-HXMT can be found at: http://enghxmt.ihep.ac.cn/dqjh.jhtml Insight/HXMT data of this public ToO will be released very soon (i.e. a few days after observation), following to the data policy of Insight-HXMT. The data can be accessed at: http://hsuc.ihep.ac.cn/web We caution that significant data saturation may exist and is not corrected in the standard Insight-HXMT data products, since Insight-HXMT was not designed to handle very high counting rates. We are developing specific methods and codes to handle such data saturation, which have been applied successfully to the burst of SGR J1935+2154 associated with FRB 200428 (Atel #13687). However, these codes are not yet mature enough for public release. We thus suggest users of these data products be aware of these effects. For assistance on accessing and analyzing the Insight-HXMT data, please contact Dr. X.-B. Li at lixb@ihep.ac.cn As of May 10, 2020, about 100 bursts from SGR J1935+2154 have been found in a preliminary search of the raw data of HE, ME and LE. The online catalogue of SGR J1935+2154 bursts detected by Insight-HXMT could be found at: http://enghxmt.ihep.ac.cn/bfy/331.jhtml The sensitivities (3-sigma) of Insight-HXMT to short bursts are: HE (20 - 250 keV):  Fluence = 4.5E-9 * sqrt(T)  erg/cm2, ME ( 5 - 30  keV):  Fluence = 3.5E-9 * sqrt(T)  erg/cm2, LE ( 1 - 10  keV):  Fluence = 2.7E-9 * sqrt(T)  erg/cm2, where T is the burst duration in second. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28027 SUBJECT: Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations DATE: 20/06/25 07:26:57 GMT FROM: Shaolin Xiong at IHEP C.-K. Li, C. Cai, S.-N. Zhang, S.-L. Xiong, X.-B. Li, M.-Y. Ge, S.-M. Jia, J.-Y. Nie, H.-S. Zhao, C.-Z. Liu, Y. Chen, X.-L. Cao, Y.-P. Xu, F.-J. Lu, L.-M. Song (IHEP), T.-P. Li (THU/IHEP), on behalf of the Insight-HXMT team: From 2020-04-28 07:14:51 to 2020-06-01 01:05:48 UTC, Insight/HXMT has been observing SGR J1935+2154 under a dedicated public ToO. In previous reports (GCN #27718, Atel #13729), a preliminary list of x-ray bursts has been reported. Here we update the basic information of this burst list, which can be found at: http://enghxmt.ihep.ac.cn/bfy/331.jhtml. In this updated and refined analysis, all data of HE, ME and LE of Insight-HXMT have been extensively searched for bursts with time scales from 5 ms to 1 s, followed by a careful screening of false positives. A total of 133 bursts has been yielded. The trigger time (i.e. the arrival time at Insight-HXMT, without correction to geocentric time), fluence and duration of these bursts are also included in this online catalog. Details about this analysis will be published in forthcoming papers. The sensitivities (3-sigma) of Insight-HXMT to short bursts were reported in GCN #27718 and Atel #13729. Time intervals that SGR J1935+2154 was effectively monitored by Insight-HXMT (i.e. excluding Earth blocking and detector turn-off during SAA passages) has also been updated and could be found at: http://enghxmt.ihep.ac.cn/dqjh/317.jhtml Requests for targeted searches for fainter bursts at specific times and/or for specific intervals may be sent to C.-K. Li (lick@ihep.ac.cn). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29374 SUBJECT: Fermi GBM Observations of SGR J1935+2154 DATE: 21/01/29 23:56:51 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA), J. Wood (USRA), A. von Kienlin (MPE), P. Veres (UAH) and G. Younes (GWU) report on behalf of the Fermi GBM Team: "At 15:23:29.92 UT on January 29th 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located a burst from SGR 1935+2154 (trigger 633626614 / 210129641). SGR J1935 bursts have also been reported by Konus-Wind (Ridnaia et al., GCN 29373), GECAM (Y. Huang et al., GCN 29363) and Swift-BAT (Ridania et al., GCN 29365). The GBM on-ground location is consistent with the known position of the SGR. The burst has a duration (T90) of about 0.1 seconds. There are two additional bursts that also appear to be from SGR J1935, about 354s after the trigger time. It is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is 0.2 (+0.2/-0.2) and the cutoff energy, parameterized as Epeak, is 32.9 (+0.6/-0.6) keV. The event fluence (10-1000 keV) from T0-0.064s to T0+0.064s is (5.2 +/- 0.1)E-7 erg/cm^2. The average photon flux in the 10-1000 keV band during this period is 94.6 +/- 1.9 ph/s/cm^2. The spectrum is also well fit using a double blackbody (BB+BB) fit, with low and high temperatures of 6.2 (+0.6/-0.7) and 12.5 (+1.6/-1.3) keV, respectively. Fermi GBM also subsequently triggered on multiple bursts from SGR J1935+2154 on January 24th, 28th and today, with a fraction of these being misclassified as GRBs. These triggers are: January 29th: 210129886 / 633647760 (21:15:55.98 UTC) 210129441 / 633609344 (10:35:39.94 UTC) 210129116 / 633581187 (02:46:22.58 UTC) January 28th 210128983 / 633569707 (23:35:02.48 UTC) January 24th 210124867 / 633214108 (20:48:24.00 UTC) 210124325 / 633167319 (07:48:34.36 UTC) The spectral analysis results presented above are preliminary. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/” //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29388 SUBJECT: Fermi GBM Observations of a bright burst from SGR J1935+2154 DATE: 21/02/03 17:20:33 GMT FROM: Elisabetta Bissaldi at INFN,Bari E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team: "At 12:54:27.00 UT on 2 February 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located a burst from SGR J1935+2154 (trigger 633963272/210202538). The same burst was also reported by INTEGRAL (Ricciarini et al. 2021, GCN 29383). The GBM on-ground location is consistent with the known position of the SGR. The angle from the Fermi LAT boresight at the GBM trigger time is 90 degrees. The burst has a duration (T90) of about 0.1 seconds in the energy range 10-200 keV. The time-averaged spectrum from T0-0.048 s to T0+0.96 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is 0.28 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 34.1 +/- 0.6 keV. The event fluence (10-1000 keV) in this time interval is (8.25 +/- 0.14)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0 in the 10-1000 keV band is 152 +/- 5 ph/s/cm^2. The spectral analysis results presented above are preliminary. GBM will continue to monitor the source and issue GCNs for bright bursts from SGR J1935+2154 that have been observed by other instruments with improved localizing capabilities, and for SGR bursts initially misclassified as GRBs. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30407 SUBJECT: Fermi GBM Observations of SGR J1935+2154 DATE: 21/07/07 16:31:42 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH), C. Malacaria (USRA), and C. Fletcher (USRA) report on behalf of the Fermi GBM Team: "At 00:33:31.67 UT on 7 July 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located a burst from SGR 1935+2154 (trigger 647310816 /210707023). Bursts from SGR 1935+2154 have been recently reported by Integral/IBAS (Mereghetti et al. 2021, GCN 30395), GECAM-B (Xiao et al. 2021, GCN 30400), and Swift/BAT (Palmer et al. 2021, GCN 30406). The GBM on-ground location is consistent with the known position of the SGR. The burst has a duration (T90) of about 0.1 seconds and is best fit by a power law function with an exponential high-energy cutoff. The power law index is 0.54 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 36.1 +/- 0.3 keV. The event fluence (10-1000 keV) from T0-0.064 to T0+0.128 is (2.52 +/- 0.03)E-06 erg/cm^2, and the average photon flux (10-1000 keV) over this time period is 289 +/- 3 ph/s/cm^2. Fermi GBM also triggered on two other bursts from SGR 1935+2154. The first occurred on 6 July 2021 at 03:50:09.75 UT (trigger 647236214 / 210706160) and the second on 7 July 2021 at 15:45:11.08 UT (trigger 647365516 / 210707656). Additionally, an automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified a potential burst from SGR 1935+2154. This event (trigger 647276517) occurred on 6 July 2021 at 15:01:52.68 UT. It is approximately 0.1 s in duration and displays emission between 30-300 keV. The burst localization is broadly consistent with the SGR position. The spectral analysis results presented above are preliminary. We encourage multi-wavelength observations to follow-up this most recent activation. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30437 SUBJECT: GECAM detection of a short burst from SGR J1935+2154 DATE: 21/07/10 13:52:17 GMT FROM: Wangchen Xue at IHEP W. C. Xue, S. Xiao, S. L. Xiong, X. Y. Zhao, X. Y. Song, C. Cai, Y. Huang, S. L. Xie, J. C. Liu, C. Y. Li, Y. Q. Zhang, Y. Zhao, Z. W. Guo, C. Zheng, Z. H. An, C. Chen, G. Chen, W. Chen, M. Gao, K. Gong, D. Y. Guo, J. J. He, B. Li, C. Li, J. H. Li, Q. X. Li, X. B. Li, X. Q. Li, Y. G. Li, X. H. Liang, J. Y. Liao, J. C. Liu, X. J. Liu, Y. Q. Liu, F. J. Lu, Q. Luo, X. Ma, G. Ou, W. X. Peng, R. Qiao, D. L. Shi, J. Y. Shi, L. M. Song, G. X. Sun, X. L. Sun, Y. L. Tuo, C. W. Wang, J. Z. Wang, P. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, M. Yao, Q. B. Yi, B. X. Zhang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, H. M. Zhang, K. Zhang, P. Zhang, S. N. Zhang, Z. Zhang, S. Y. Zhao, S. J. Zheng, X. Zhou (IHEP), report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a bright short burst (trig# 79592741) at 2021-07-10T05:05:41.450 UTC (T0), Its alert data was promptly downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS). The time latency of the first BeiDou message relative to the trigger time is about 1 minute. According to the GECAM-B light curves in about 20-50 keV, this burst mainly consists of a single pulse with a duration about 50 ms. The position is consistent with SGR J1935+2154 within the error. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/79592741.45000005energys.pdf Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30449 SUBJECT: GECAM detection of a short burst from SGR J1935+2154 DATE: 21/07/12 12:48:27 GMT FROM: Shuo Xiao at IHEP C. Y. Li, W. C. Xue, S. Xiao, S. L. Xiong, X. Y. Zhao, X. Y. Song, C. Cai, Y. Huang, S. L. Xie, J. C. Liu, Y. Q. Zhang, Y. Zhao, Z. W. Guo, C. Zheng, Z. H. An, C. Chen, G. Chen, W. Chen, M. Gao, K. Gong, D. Y. Guo, J. J. He, B. Li, C. Li, J. H. Li, Q. X. Li, X. B. Li, X. Q. Li, Y. G. Li, X. H. Liang, J. Y. Liao, J. C. Liu, X. J. Liu, Y. Q. Liu, F. J. Lu, Q. Luo, X. Ma, G. Ou, W. X. Peng, R. Qiao, D. L. Shi, J. Y. Shi, L. M. Song, G. X. Sun, X. L. Sun, Y. L. Tuo, C. W. Wang, J. Z. Wang, P. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, M. Yao, Q. B. Yi, B. X. Zhang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, H. M. Zhang, K. Zhang, P. Zhang, S. N. Zhang, Z. Zhang, S. Y. Zhao, S. J. Zheng, X. Zhou (IHEP), report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a bright short burst (trig# 79763559) at 2021-07-12T04:32:39.600 UTC (T0), Its alert data was promptly downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS). The time latency of the first BeiDou message relative to the trigger time is about 1 minute. According to the GECAM-B light curves in about 20-100 keV, this burst mainly consists of a single pulse with a duration about 50 ms. The location is consistent with SGR J1935+2154 within the error. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/79763559.600energys.pdf Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30459 SUBJECT: GECAM detection of a short burst from SGR J1935+2154 DATE: 21/07/13 13:29:50 GMT FROM: Shuo Xiao at IHEP C. Y. Li, W. C. Xue, S. Xiao, S. L. Xiong, X. Y. Zhao, X. Y. Song, C. Cai, Y. Huang, S. L. Xie, J. C. Liu, Y. Q. Zhang, Y. Zhao, Z. W. Guo, C. Zheng, Z. H. An, C. Chen, G. Chen, W. Chen, M. Gao, K. Gong, D. Y. Guo, J. J. He, B. Li, C. Li, J. H. Li, Q. X. Li, X. B. Li, X. Q. Li, Y. G. Li, X. H. Liang, J. Y. Liao, J. C. Liu, X. J. Liu, Y. Q. Liu, F. J. Lu, Q. Luo, X. Ma, G. Ou, W. X. Peng, R. Qiao, D. L. Shi, J. Y. Shi, L. M. Song, G. X. Sun, X. L. Sun, Y. L. Tuo, C. W. Wang, J. Z. Wang, P. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, M. Yao, Q. B. Yi, B. X. Zhang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, H. M. Zhang, K. Zhang, P. Zhang, S. N. Zhang, Z. Zhang, S. Y. Zhao, S. J. Zheng, X. Zhou (IHEP), report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a bright short burst (trig# 79827178) at 2021-07-12T22:12:58.100 UTC (T0), Its alert data was promptly downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS). The time latency of the first BeiDou message relative to the trigger time is about 1 minute. According to the GECAM-B light curves in about 20-100 keV, this burst mainly consists of a single pulse with a duration about 50 ms. The location is consistent with SGR J1935+2154 within the error. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/79827178.1energys.png Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30793 SUBJECT: GECAM observation of a burst from SGR J1935+2154 DATE: 21/09/10 01:35:01 GMT FROM: Shuo Xiao at IHEP S. Xiao, S. L. Xiong, Y. Zhao, X. Y. Zhao, Y. Huang, X. Y. Song, C. Cai, S. L. Xie, Y. Q. Zhang, Z. W. Guo, J. C. Liu, C. Zheng, W. C. Xue, C. Y. Li, C. W. Wang, Q. B. Yi, B. X. Zhang, P. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, L. M. Song, F. J. Lu, S. N. Zhang (IHEP), report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a bright short burst (trig# 84920832) at 2021-09-09T21:07:12.150 UTC (T0), Its alert data was promptly downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS). The time latency of the first BeiDou message relative to the trigger time is about 1 minute. According to the GECAM-B light curves in about 15-65 keV, this burst mainly consists of a single pulse with a duration about 100 ms. The location is consistent with SGR J1935+2154 within the error. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/utn210909_210712_GECAMb.png Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30794 SUBJECT: GECAM observation of a burst from SGR J1935+2154 DATE: 21/09/10 02:47:18 GMT FROM: Shuo Xiao at IHEP S. Xiao, S. L. Xiong, Y. Zhao, X. Y. Zhao, Y. Huang, X. Y. Song, C. Cai, S. L. Xie, Y. Q. Zhang, Z. W. Guo, J. C. Liu, C. Zheng, W. C. Xue, C. Y. Li, C. W. Wang, Q. B. Yi, B. X. Zhang, P. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, L. M. Song, F. J. Lu, S. N. Zhang (IHEP), report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a bright short burst (trig# 84938908) at 2021-09-10T02:08:28.800 UTC (T0), Its alert data was promptly downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS). The time latency of the first BeiDou message relative to the trigger time is about 1 minute. According to the GECAM-B light curves in about 15-65 keV, this burst mainly consists of a single pulse with a duration about 100 ms. The location is consistent with SGR J1935+2154 within the error. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/utn210910_020828_GECAMb.png Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30797 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 21/09/10 13:56:58 GMT FROM: Shuo Xiao at IHEP S. Xiao, S. L. Xiong, C. Cai, Y. Huang, Z. W. Guo, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, C. W. Wang, P. Wang, S. L. Xie, W. C. Xue, Q. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, Yi Zhao, C. Zheng, W. Chen, Y. Q. Du, D. Y. Guo, J. J. He, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu, P. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP), report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2021-09-09T20:58:35.600 2021-09-09T21:07:12.100 2021-09-10T01:04:33.500 2021-09-10T02:07:56.700 2021-09-10T02:08:28.800 2021-09-10T03:22:40.550 2021-09-10T03:24:47.150 2021-09-10T03:42:45.750 2021-09-10T05:05:03.350 2021-09-10T05:35:55.500 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30822 SUBJECT: GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08) DATE: 21/09/12 14:39:57 GMT FROM: Wangchen Xue at IHEP W. C. Xue, S. L. Xiong, C. Cai, Y. Huang, Z. W. Guo, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, C. W. Wang, P. Wang, S. L. Xie, S. Xiao, Q. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, Y. Zhao, C. Zheng, W. Chen, Y. Q. Du, D. Y. Guo, J. J. He, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu, P. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP), report on behalf of GECAM team: GECAM-B detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data, from 2021-09-11T07 to 2021-09-12T08. Here is the list of these bursts: Trigger Time (UTC) 2021-09-11T07:15:04.000 2021-09-11T16:35:46.500 2021-09-11T16:36:57.900 2021-09-11T16:38:01.050 2021-09-11T16:39:21.000 2021-09-11T16:50:03.850 2021-09-11T17:00:41.900 2021-09-11T17:01:09.800 2021-09-11T17:01:59.550 2021-09-11T17:04:29.800 2021-09-11T17:10:48.750 2021-09-11T18:02:13.500 2021-09-11T18:04:46.350 2021-09-11T18:54:36.050 2021-09-11T19:43:29.000 2021-09-11T19:46:50.050 2021-09-11T20:13:40.550 2021-09-11T20:22:59.050 2021-09-11T20:33:14.550 2021-09-11T21:07:28.350 2021-09-11T22:51:41.600 2021-09-12T00:34:37.450 2021-09-12T00:45:49.400 2021-09-12T05:14:07.950 2021-09-12T06:51:13.700 2021-09-12T07:28:07.500 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30836 SUBJECT: GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01) DATE: 21/09/13 15:03:09 GMT FROM: Ce Cai at IHEP C. Cai, S. L. Xiong, Y. Huang, W. C. Xue, Z. W. Guo, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, C. W. Wang, P. Wang, S. L. Xie, S. Xiao, Q. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, Yi Zhao, C. Zheng, W. Chen, Y. Q. Du, D. Y. Guo, J. J. He, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu, P. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP), report on behalf of GECAM team: GECAM-B detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data, from 2021-09-12T05 to 2021-09-13T01. Here is the list of these bursts: Trigger Time (UTC) 2021-09-12T05:44:17.050 2021-09-12T16:26:08.150 2021-09-12T16:52:07.950 2021-09-12T22:16:36.200 2021-09-13T00:27:25.200 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30841 SUBJECT: GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14) DATE: 21/09/15 14:40:52 GMT FROM: Shuo Xiao at IHEP C. Y. Li, C. Cai, S. L. Xiong, Y. Huang, W. C. Xue, Z. W. Guo, X. B. Li, J. C. Liu, X. Y. Song, C. W. Wang, P. Wang, S. L. Xie, S. Xiao, Q. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, Y. Zhao, C. Zheng, W. Chen, Y. Q. Du, D. Y. Guo, J. J. He, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu, P. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP), report on behalf of GECAM team: GECAM-B detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data, from 2021-09-13T01 to 2021-09-15T14 (UTC). Here is the list of these bursts: Trigger Time (UTC) 2021-09-13T14:12:39.650 2021-09-13T19:51:32.950 2021-09-14T11:10:36.250 2021-09-14T14:15:42.900 2021-09-14T23:21:58.500 2021-09-14T23:26:34.050 2021-09-15T02:35:47.350 2021-09-15T02:39:25.700 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30869 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14) DATE: 21/09/23 14:19:30 GMT FROM: Chenwei Wang at IHEP C. W. Wang, S. L. Xiong, Y. Huang, C. Cai, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, P. Wang, S. L. Xie, S. Xiao, Z. W. Guo, W. C. Xue, Q. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, Y. Zhao, C. Zheng, W. Chen, Y. Q. Du, D. Y. Guo, J. J. He, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu, P. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP), report on behalf of GECAM team: GECAM-B detected a series of bursts very probably from SGR J1935+2154 either by in-flight trigger or by on-ground search of the data, from 2021-09-15T14 to 2021-09-23T14(UTC). Here is the list of these bursts: Trigger Time (UTC) 2021-09-15T15:32:56.050 2021-09-17T12:52:37.800 2021-09-17T13:58:25.100 2021-09-18T22:58:52.150 2021-09-22T02:39:10.200 2021-09-22T20:12:16.500 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31391 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 22/01/05 14:33:13 GMT FROM: Y Q Zhang at IHEP Y. Q. Zhang, S. L. Xiong, C. Cai, S. Xiao, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, J. C. Liu, Y. Zhao, Z. W. Guo, C. Zheng, W. C. Xue, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2022-01-04T04:32:11.200 2022-01-05T06:01:31.450 2022-01-05T07:06:40.800 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31428 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 22/01/10 14:41:45 GMT FROM: Zhao Yi at POLAR Y. Zhao, Y. Q. Zhang, S. L. Xiong, C. Cai, S. Xiao, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, J. C. Liu, Z. W. Guo, C. Zheng, W. C. Xue, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2022-01-08T14:41:46.900 2022-01-09T07:39:10.700 2022-01-10T06:52:40.500 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31443 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 22/01/12 13:33:41 GMT FROM: Shuo Xiao at IHEP S. Xiao, Y. Zhao, Y. Q. Zhang, S. L. Xiong, C. Cai, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, J. C. Liu, Z. W. Guo, C. Zheng, W. C. Xue, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2022-01-11T08:58:35.450 2022-01-12T01:03:46.900 2022-01-12T05:42:51.650 2022-01-12T08:39:25.450 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31445 SUBJECT: Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154 DATE: 22/01/12 21:42:20 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA/NASA-MSFC) reports on behalf of the Fermi GBM Team: “The Fermi Gamma-ray Burst Monitor (GBM) trigger 220112832/663710289 at 19:58:04.04 UT on 12 January 2022, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to SGR 1935+2154. Fermi-GBM has triggered on 29 bursts from the direction of SGR J1935+2154 since December 24th 2021, some of which may have been misclassified as GRBs. This list at the time of writing (including the most recent one) is: Date and Time in UTC Fermi MET (s) 2022-01-12T19:58:04.04 663710289 2022-01-12T08:39:25.34 663669570 2022-01-12T05:42:51.54 663658976 2022-01-12T04:31:20.07 663654685 2022-01-12T02:19:22.23 663646767 2022-01-12T02:05:58.27 663645963 2022-01-12T01:03:46.83 663642231 2022-01-11T21:54:01.18 663630846 2022-01-11T18:21:07.76 663618072 2022-01-11T17:05:55.66 663613560 2022-01-11T08:58:35.36 663584320 2022-01-11T07:48:21.49 663580106 2022-01-11T05:42:12.27 663572537 2022-01-10T15:55:38.32 663522943 2022-01-10T04:31:43.13 663481908 2022-01-10T02:57:16.80 663476241 2022-01-09T12:57:21.98 663425846 2022-01-09T09:28:12.79 663413297 2022-01-09T07:39:10.69 663406755 2022-01-09T04:57:16.14 663397041 2022-01-08T14:41:46.89 663345711 2022-01-06T02:36:14.05 663129379 2022-01-05T07:06:40.74 663059205 2022-01-05T06:01:31.43 663055296 2022-01-04T04:32:11.17 662963536 2021-12-29T16:41:26.20 662488891 2021-12-26T12:55:09.72 662216114 2021-12-25T22:22:20.14 662163745 2021-12-24T03:42:34.36 662010159 Fermi-GBM will not report on future triggers from this source during its current outbursting phase. We encourage multi-wavelength observations to follow-up this most recent activation. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/” //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31448 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 22/01/14 14:34:11 GMT FROM: Ce Cai at IHEP C. Cai, Y. Q. Zhang, S. L. Xiong, S. Xiao, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, J. C. Liu, Y. Zhao, Z. W. Guo, C. Zheng, W. C. Xue, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2022-01-12T17:57:08.500 2022-01-13T19:36:08.600 2022-01-13T20:14:58.600 2022-01-13T21:41:17.900 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31464 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 22/01/16 14:20:30 GMT FROM: Wangchen Xue at IHEP W. C. Xue, C. Cai, Y. Q. Zhang, S. L. Xiong, S. Xiao, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, J. C. Liu, Y. Zhao, Z. W. Guo, C. Zheng, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2022-01-14T19:42:08.050 2022-01-14T19:45:08.100 2022-01-14T19:56:52.700 2022-01-14T20:06:07.400 2022-01-14T20:07:03.050 2022-01-14T20:12:45.300 2022-01-14T20:15:54.400 2022-01-14T20:21:05.150 2022-01-14T20:23:35.400 2022-01-14T20:26:50.300 2022-01-14T20:29:07.250 2022-01-14T20:31:49.900 2022-01-15T09:26:39.900 2022-01-15T13:52:26.050 2022-01-15T16:31:14.900 2022-01-15T17:21:59.300 2022-01-16T10:48:37.650 2022-01-16T10:59:28.800 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31527 SUBJECT: GECAM observations of a series of bursts from SGR J1935+2154 DATE: 22/01/28 03:56:03 GMT FROM: Y Q Zhang at IHEP C. Zheng, J. C. Liu, Y. Q. Zhang, S. L. Xiong, C. Cai, S. Xiao, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, Y. Zhao, Z. W. Guo, W. C. Xue, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: GECAM-B has detected a series of bursts very probably from SGR J1935+2154, either by in-flight trigger or by on-ground search of the data. Here is the list of these bursts: Trigger Time (UTC) 2022-01-20T18:52:48.950 2022-01-23T20:06:38.750 2022-01-24T02:10:55.050 2022-01-24T02:27:07.400 Locations of all these bursts are consistent with SGR J1935+2154. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32154 SUBJECT: Trigger 1108538: Swift detection of a burst from SGR J1935+2154 DATE: 22/05/30 20:49:17 GMT FROM: David Palmer at LANL A. Y. Lien (U Tampa), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 20:32:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located SGR J1935+2154 (trigger=1108538). The BAT on-board calculated location is RA, Dec 293.714, +21.901 which is RA(J2000) = 19h 34m 51s Dec(J2000) = +21d 54' 04" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.3 sec. The peak count rate was ~110,000 counts/sec (on a 64 ms timescale, 15-350 keV), at ~0 sec after the trigger. An XRT and UVOT observation of SGR J1935+2154 is scheduled for 21:50-22:18 UT (target ID 33349). This source was last seen to be active by BAT in a series of at least 36 bursts during the period Jan 9-18, 2022. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32675 SUBJECT: INTEGRAL detection of a burst from SGR J1935+2154 DATE: 22/10/11 06:15:33 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: A burst from SGR J1935+2154 has been detected by IBAS in the IBIS/ISGRI data at 21:28:25.8 UT of 10 October 2022. The corresponding alert packet (n.10049) with the correct source identification was automatically distributed in real time. The burst had a duration of about 0.4 s and a fluence of about 3e-8 erg/cm2 (20-200 keV). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32698 SUBJECT: INTEGRAL detection of a burst from SGR J1935+2154 DATE: 22/10/12 05:28:08 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: A burst from SGR J1935+2154 with duration 0.35 s and fluence of about 1e-8 erg/cm2 (20-200 keV) has been detected in the IBIS/ISGRI data at 23:22:49 UT of 11 October 2022. The burst was detected as a subthreshold event by IBAS and the corresponding alert packet of type "WEAK" (n.10051) distributed in real time. The bursts recently reported with INTEGRAL (Mereghetti et al. GCN 32675) and Swift/BAT (Palmer et al. ATel 15667) indicate a reactivation of the magnetar, which will be in the imaging field of view of INTEGRAL until 2022-10-13 00:58:26. Multiwavelength observations are encouraged. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32706 SUBJECT: INTEGRAL shows increasing activity in SGR J1935+2154 DATE: 22/10/12 16:02:05 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: At least 30 short bursts in one hour from SGR J1935+2154 have been detected in IBIS/ISGRI data starting from 14:22:47 of October 12. Note that only the most significant events generate automatic alert packets, but a quick look analysis shows many more bursts indicating that a "burst forest" is currently ongoing. Multiwavelength observations are encouraged. SGR J1935+2154 will be in the imaging field of view of INTEGRAL until 2022-10-13 00:58:26. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32708 SUBJECT: Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154 DATE: 22/10/12 20:00:17 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA/NASA-MSFC), S. Dalessi (UAH) and C. Malacaria (ISSI) report on behalf of the Fermi GBM Team: “The Fermi Gamma-ray Burst Monitor (GBM) trigger 221012599/687277371 at 14:22:46.99 UT on 12 October 2022, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to SGR 1935+2154. Fermi-GBM has triggered on 16 bursts from the direction of SGR J1935+2154 since September 27th 2022. The list of SGR bursts at the time of writing (including the most recent one) is: Date and Time in UTC Fermi MET (s) 2022-10-12T17:39:26.16 687289171 2022-10-12T17:00:47.29 687286852 2022-10-12T16:11:15.04 687283880 2022-10-12T16:00:48.84 687283253 2022-10-12T15:40:10.21 687282015 2022-10-12T15:29:48.48 687281393 2022-10-12T15:14:04.13 687280449 2022-10-12T14:22:46.99 687277371 2022-10-12T12:47:04.40 687271629 2022-10-11T14:11:36.80 687190301 2022-10-11T10:41:16.68 687177681 2022-10-05T21:50:15.79 686699420 2022-10-05T15:35:06.25 686676911 2022-10-02T11:33:41.08 686403226 2022-10-01T20:50:55.74 686350260 2022-09-27T20:51:09.08 686004674 Of these, the following have been misclassified as GRBs: Date and Time in UTC Fermi MET (s) 2022-10-12T15:40:10.21 687282015 2022-10-12T15:29:48.48 687281393 2022-10-12T15:14:04.13 687280449 2022-10-12T14:22:46.99 687277371 2022-10-12T12:47:04.40 687271629 There are many more bursts that did not trigger GBM in the data during this time interval. We report a small burst forest around 2022-10-12T15:40:10.21 UTC. We assume this to be the same burst forest episode as that reported by INTEGRAL (S. Mereghetti et al., GCN #32706) Bursting activity from this source is continuing. We encourage multi-wavelength observations to follow-up this most recent activation. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/” //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32789 SUBJECT: AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts DATE: 22/10/18 12:18:39 GMT FROM: Francesco Verrecchia at SSDC,INAF-OAR C. Casentini (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Pilia (INAF/OA-Cagliari), � A. Ursi, A. Argan, M. Cardillo, L. Foffano, Y. Evangelista, E. Menegoni, G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, C. Pittori(SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F. Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE Anti-Coincidence system (AC Top; 50-200 keV), is detecting short X-ray flaring activity from October 12nd 2022, at times within the X-ray burst forest reported by INTEGRAL (GCN #32706), Fermi/GBM (GCN #32708, #32737, ATel #15672), Swift (ATel #15667), and NICER (ATel #15674). The time of the radio burst (2022-10-14 19:21:47) detected by CHIME/FRB (Atel #15681) and the associated X-ray burst detected by GECAM and HEBS (Atel #15682) and Konus-Wind (GCN #2770) falls within a SAA passage. Moreover AGILE AC is also detecting activity related to the bursts reported by Konus-Wind  (GCN #32768) and Fermi/GBM (GCN #32764). We selected significant AC Top events occurring when SGR J1935+2154 was within the AGILE field-of-view at off-axis angles <= 70 degrees. We report the following 33 X-ray bursts at times within 2hrs from the Swift, Fermi/GBM, and Konus-Wind bursts:     Date (UT)         Counts    Significance  2022-10-01 21:57:59  3970.43    11.69 sigma ; +1h  from Fermi/GBM trigger  2022-10-02 10:24:05  3944.53    13.33 sigma ; -1h  from Fermi/GBM trigger  2022-10-02 11:45:31  4022.77    14.72 sigma ; +12m from Fermi/GBM trigger  2022-10-02 11:54:18  3899.73    12.54 sigma ; +21m from Fermi/GBM trigger  2022-10-05 15:46:44  4367.29    18.83 sigma ; +11m from Fermi/GBM trigger  2022-10-05 21:06:08  4031.74    15.32 sigma ; -44m from Fermi/GBM trigger  2022-10-05 21:54:00  3747.75    10.27 sigma ; +4m  from Fermi/GBM trigger  2022-10-10 01:35:58  3902.83    14.00 sigma ; -4m  from Swift trigger  2022-10-10 09:05:40  3891.70    10.29 sigma ; -10m from Swift trigger  2022-10-10 14:00:03  3886.20    10.44 sigma ; -12m from Swift trigger  2022-10-10 20:53:32  3714.24    10.88 sigma ; -30m from Swift trigger  2022-10-10 21:40:42  3786.05    12.17 sigma ; +12m from Swift trigger  2022-10-10 23:19:25  3673.79    10.16 sigma ; +1h50m from Swift trigger  2022-10-11 10:27:56  4061.66    14.66 sigma ; -14m from Fermi/GBM trigger  2022-10-11 10:44:26  4156.55    16.33 sigma ; +3m  from Fermi/GBM trigger  2022-10-11 13:56:18  4089.80    11.43 sigma ; -15m from Fermi/GBM trigger  2022-10-12 12:47:10  3771.73    7.33  sigma ; +6s from Fermi/GBM trigger  2022-10-12 14:23:18  3977.49    10.88 sigma ; +30s from Fermi/GBM trigger  2022-10-12 14:44:45  4361.14    17.14 sigma ; +22m from Fermi/GBM trigger  2022-10-12 15:51:41  3959.15    10.21 sigma ; +11m from Fermi/GBM trigger  2022-10-12 16:21:38  4143.65    13.39 sigma ; +11m from Fermi/GBM trigger  2022-10-12 17:08:20  4335.50    16.19 sigma ; +8m  from Fermi/GBM trigger  2022-10-13 22:47:40  3704.51   10.49 sigma ; +6m  from trigger KW  2022-10-14 06:55:27  3932.92   11.37 sigma ; -17m from trigger KW  2022-10-14 07:12:35  3720.07   7.65  sigma ; +6s from trigger KW, +7s from trigger FERMI/GBM  2022-10-14 07:24:52  3728.30   7.80  sigma ; +10s from trigger FERMI/GBM  2022-10-14 08:25:59  4016.67   12.83 sigma ; +1h13m from KW trigger  2022-10-14 08:33:00  3890.61   10.63 sigma ; +1h21m from KW trigger  2022-10-14 08:38:24  4502.51   21.31 sigma ; +1h26m from KW trigger  2022-10-14 11:40:42  3782.95   7.32  sigma ; -1'10s from Fermi/GBM trigger  2022-10-14 13:20:48  3801.83   8.37  sigma ; +17s from Fermi/GBM trigger  2022-10-14 13:29:21  3917.88   10.39 sigma ; +9m   from Fermi/GBM trigger  2022-10-14 14:29:38  4317.47   17.32 sigma ; +25m  from Fermi/GBM trigger where the typical burst duration is one second (single bin). An AGILE AC ratemeters light curve can be found at https://tools.ssdc.asi.it/ImgView/Agile/AGILE-AC-RM_SGR_burst_14_10_2253 Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32796 SUBJECT: AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind DATE: 22/10/18 20:30:10 GMT FROM: Francesco Verrecchia at SSDC,INAF-OAR F. Verrecchia (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Ursi (INAF/IAPS), M. Pilia (INAF/OA-Cagliari), A. Argan, M. Cardillo, L. Foffano, Y. Evangelista, E. Menegoni, G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F. Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE Anti-Coincidence system (AC Top; 50-200 keV), has detected a short X-ray burst coincident with the SGR J1935+2154 burst detected by Konus-Wind (GCN #32792) on 2022 October 17, at time 11:14:43.010 UT. AGILE has recently reported the detection of X-ray flaring activity with AC Top (GCN #32789) at time intervals near those reported by INTEGRAL, Fermi/GBM, Swift, NICER and Konus-Wind, having SGR J1935+2154 within the AGILE FoV. We report the AGILE AC Top detection of the burst on October 17 with the following parameters: 2022-10-17 11:14:43 , Counts: 4548 cts/s , Bkg: 2790 Hz , 23.62 sigma This detection is an important confirmation of the origin of the X-ray flaring activity reported in GCN #32789 without a direct localization. Moreover the burst recently reported by GRBAlpha (GCN #32794) at time 2022-10-14 07:12:27.8 UT (with 4s time resolution), occurs 7.2 s before one of the 33 bursts reported in GCN #32789. The AGILE AC ratemeters light curve including the October 17 burst can be found at: http://www.agilescienceapp.it/notices/SGR221017_AGILE_RM.png Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32801 SUBJECT: AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2 DATE: 22/10/19 11:47:41 GMT FROM: Francesco Verrecchia at SSDC,INAF-OAR  C. Casentini (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Pilia (INAF/OA-Cagliari), A. Argan, M. Cardillo, L. Foffano, Y. Evangelista, E. Menegoni, G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F. Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE Anti-Coincidence system (AC Top, 50-200 keV; AC Lat3, 80-200 keV), has detected also a short X-ray burst coincident with the SGR J1935+2154 burst reported by VZLUSAT-2 (GCN #32797), as reported yesterday (GCN #32796) for the 2022 October 17 burst by Konus-Wind (GCN #32792). The burst detected by VZLUSAT-2 occurred on October 12 at time 2022-10-12 23:26:41. We report the detection of AC Top and AC Lat3 with the following parameters ACTop: 2022-10-12 23:26:41 , Counts: 3549 cts/s , Bkg: 3080 Hz , 8.45 sigma ACLAT3: 2022-10-12 23:26:41 , Counts: 3500 cts/s , Bkg: 2400 Hz , 21.50 sigma This burst was not included in the 33 bursts reported in GCN #32789 because it occurred when the source was at off-axis angle slightly higher than our threshold. We note that for this reason the burst is also detected at higher significance on the AC Lat3. Also this detection is a confirmation of the X-ray bursting activity reported by AGILE AC Top (GCN #32796). The AGILE AC ratemeters light curve including the October 12 burst can be found at: http://www.agilescienceapp.it/notices/sgr_burst_12_10_22.png Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32922 SUBJECT: Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154 DATE: 22/11/09 22:25:58 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM Team: "Fermi-GBM has triggered on 7 bursts from the direction of SGR J1935+2154 since November 8th 2022. The list of SGR bursts at the time of writing (including the most recent one) is: Date and Time in UTC Fermi MET (s) 2022-11-09T19:01:17.22 689713282 2022-11-09T17:46:18.39 689708783 2022-11-09T17:35:49.15 689708154 2022-11-09T17:05:04.71 689706309 2022-11-09T16:06:08.62 689702773 2022-11-09T14:33:10.12 689697195 2022-11-08T19:48:49.90 689629734 Of these, the following have been misclassified as GRBs: Date and Time in UTC Fermi MET (s) 2022-11-09T19:01:17.22 689713282 2022-11-09T17:46:18.39 689708783 2022-11-09T17:35:49.15 689708154 2022-11-09T17:05:04.71 689706309 2022-11-09T16:06:08.62 689702773 2022-11-09T14:33:10.12 689697195 Bursting activity from this source is continuing. We encourage multi-wavelength observations to follow-up this most recent activation. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/”