//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30298 SUBJECT: GRB 210622B: Fermi GBM Final Real-time Localization DATE: 21/06/22 10:43:25 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 10:33:01 UT on 22 Jun 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210622B (trigger 646050786.759848 / 210622440). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 126.5, Dec = -13.1 (J2000 degrees, equivalent to J2000 08h 26m, -13d 05'), with a statistical uncertainty of 5.3 degrees. The angle from the Fermi LAT boresight is 35.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622440/quicklook/glg_skymap_all_bn210622440.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622440/quicklook/glg_healpix_all_bn210622440.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622440/quicklook/glg_lc_medres34_bn210622440.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30300 SUBJECT: GECAM detection of GRB 210622B DATE: 21/06/22 12:39:19 GMT FROM: Chao Zheng at IHEP C. Zheng, S. L. Xiong, Y. Huang, S. L. Xie, S. Xiao, C. Cai, J. C. Liu, C. Y. Li, Y. Q. Zhang, W. C. Xue, Y. Zhao, Z. W. Guo, X. Y. Zhao, 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, X. Y. 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 long burst at 2021-06-22T10:33:02.600 UTC (denoted as T0), which was also observed by Fermi/GBM (GCN # 302298). 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 BDS alert data, this burst mainly consists of multiple pulses with duration of about 25 s. An automatic on-ground localization was calculated using the light curves and spectrum. Although the in-flight calibration of energy response and localization has not been finalized yet, GECAM-B localized this burst to the following position (J2000): Ra: 123.9 deg Dec: -13.8 deg Err: 4.8 deg (1-sigma, statistical only) The current systematic error of location is estimated to be several degrees which could be minimized by the ongoing calibration. This GECAM location is consistent with that of Fermi/GBM within the error. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_78057182.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: 30307 SUBJECT: Fermi GRB 210622B: Global MASTER-Net observations report DATE: 21/06/22 23:17:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 210622B ( Fermi GBM team, GCN 30298) errorbox 43469 sec after notice time and 43496 sec after trigger time at 2021-06-22 22:37:57 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 56 deg. The sun altitude is -12.0 deg. The galactic latitude b = 15 deg., longitude l = 237 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1642370 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 43526 | 2021-06-22 22:37:57 | MASTER-OAFA | (08h 14m 05.24s , -14d 37m 45.1s) | C | 60 | 17.4 | 43605 | 2021-06-22 22:39:17 | MASTER-OAFA | (08h 22m 14.70s , -14d 38m 34.0s) | C | 60 | 17.4 | 43685 | 2021-06-22 22:40:36 | MASTER-OAFA | (08h 25m 46.77s , -12d 42m 57.2s) | C | 60 | 17.6 | 43767 | 2021-06-22 22:41:58 | MASTER-OAFA | (08h 33m 57.71s , -12d 44m 12.9s) | C | 60 | 17.8 | 43847 | 2021-06-22 22:43:18 | MASTER-OAFA | (08h 10m 11.95s , -12d 43m 46.8s) | C | 60 | 17.8 | 43926 | 2021-06-22 22:44:37 | MASTER-OAFA | (08h 18m 21.69s , -12d 42m 35.5s) | C | 60 | 17.8 | 44006 | 2021-06-22 22:45:57 | MASTER-OAFA | (08h 29m 39.40s , -14d 38m 20.6s) | C | 60 | 17.6 | 44085 | 2021-06-22 22:47:17 | MASTER-OAFA | (08h 38m 00.16s , -14d 38m 01.8s) | C | 60 | 17.8 | 44165 | 2021-06-22 22:48:36 | MASTER-OAFA | (08h 18m 29.20s , -16d 32m 12.2s) | C | 60 | 17.7 | 44244 | 2021-06-22 22:49:56 | MASTER-OAFA | (08h 26m 51.96s , -16d 30m 43.5s) | C | 60 | 17.6 | 44783 | 2021-06-22 22:58:54 | MASTER-OAFA | (08h 14m 00.60s , -14d 36m 33.1s) | C | 60 | 17.8 | 44862 | 2021-06-22 23:00:14 | MASTER-OAFA | (08h 22m 20.98s , -14d 37m 22.9s) | C | 60 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.