//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28504 SUBJECT: IceCube-200926A: IceCube observation of a high-energy neutrino candidate event DATE: 20/09/26 10:15:23 GMT FROM: Cristina Lagunas Gualda at DESY The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 20/09/26 at 07:54:11.62 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Gold alert stream. The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 0.536 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/134533_53384881.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 20/09/26 Time: 07:54:11.62 UT RA: 96.46 (+ 0.73 - 0.55 deg 90% PSF containment) J2000 Dec: -4.33 (+ 0.61 - 0.76 deg 90% PSF containment) J2000 We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino. There are no Fermi-LAT 4FGL or 3FHL sources inside the 90% localization region. The closest source is 4FGL J0613.7-0201 located at RA 93.44 deg and Dec -2.02 deg (J2000), at a distance of 3.8 degrees from the best-fit location. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28510 SUBJECT: IceCube Alert 200926.33: Global MASTER-Net observations report DATE: 20/09/27 00:39:09 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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the IceCube Alert 200926.33 (trigger No 53384881,06h 26m 17.52s , -04d 12m 18.0s, R=0.51) errorbox 59270 sec after notice time and 59334 sec after trigger time at 2020-09-27 00:23:06 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 66 deg. The sun altitude is -33.5 deg. The galactic latitude b = -7 deg., longitude l = 214 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1449387 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 59424 | 2020-09-27 00:23:06 | MASTER-Tavrida | (06h 25m 45.93s , -04d 10m 21.3s) | C | 180 | 14.1 | 59604 | 2020-09-27 00:23:06 | MASTER-Tavrida | (06h 25m 45.95s , -04d 10m 21.5s) | C | 540 | 16.9 | Coadd 59625 | 2020-09-27 00:26:26 | MASTER-Tavrida | (06h 25m 53.40s , -04d 11m 23.8s) | C | 180 | 16.4 | 59826 | 2020-09-27 00:29:47 | MASTER-Tavrida | (06h 25m 46.55s , -04d 12m 25.1s) | C | 180 | 16.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28513 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-200926A DATE: 20/09/27 13:44:06 GMT FROM: Simone Garrappa at DESY S. Garrappa (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC200926A neutrino event (GCN 28504) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2020-09-26 at 07:54:11.62 UT (T0) with J2000 position RA = 96.46 (+0.73, -0.55) deg, Decl. = -4.33 (+0.61, -0.76) deg 90% PSF containment. No cataloged >100 MeV gamma-ray sources (The Fourth Fermi-LAT catalog; The Fermi-LAT collaboration 2020, ApJS, 247, 33) are located within the 90% IC200926A localization error. We searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC200926A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC200926A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.8e-10 ph cm^-2 s^-1 for ~12-years (2008-08-04 / 2020-09-26 UTC), < 2.2e-8 (< 1.1e-7) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de) and S. Buson (sara.buson at uni-wuerzburg.de). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28515 SUBJECT: Swift-XRT observations of IceCube 200926A DATE: 20/09/27 21:27:42 GMT FROM: Timothee Gregoire at Penn State T. Gregoire (PSU), P.A. Evans (U. Leicester), J.A. Kennea (PSU), H. A. Ayala Solares (PSU), D.F. Cowen (PSU), J. DeLaunay (PSU), D. B. Fox (PSU), A. Keivani (Columbia U.), J.P. Osborne (U. Leicester) report: Swift observed the field of IceCube 200926A (GCN Circ. 28504) between 11:44:33 2020 September 26 and 13:45:03 on 2020 September 26, collecting a total of 3.8 ks of cleaned photon counting (PC) mode data. The observations used a 4-point tiling pattern with a radius of ~0.3 degrees. We found 5 X-ray sources, as detailed below. All of these are either known X-ray sources, consistent with catalogued fluxes, or are unknown but with count rate consistent with the previous non-detections. We therefore do not claim any of them as the likely counterpart to IceCube 200926A A futher 4 sources were detected, but their detection flag of 4 indicates that they were likely spurious. The 3-sigma upper limit in the field was in the range 6-8 x 10^-3 ct/sec. The detected sources were: Source no:   1 RA (J2000):  96.44016 [degrees] = 06h 25m 45.64s Dec (J2000): -4.3672 [degrees] = -04d 22' 02.0" Error:       +5.5 [arcsec, 90% conf. radius] Count rate (0.3-10 keV): 0.0104 (+0.0036, -0.0029) ct s-1 Flux (0.3-10 keV):       4.5 (+1.5, -1.3) x 10-13 erg cm-2 s-1 Note: This is 3.0" from the SIMBAD object 2MASX J06254558-0422053 Source no:   2 RA (J2000):  96.44428 [degrees] = 06h 25m 46.63s Dec (J2000): -4.28706 [degrees] = -04d 17' 13.4" Error:       +6.1 [arcsec, 90% conf. radius] Count rate (0.3-10 keV): 6.2 (+2.8, -2.2) x 10^-3 ct s-1 Flux (0.3-10 keV):       2.68 (+1.19, -0.93) x 10^-13 erg cm-2 s-1 Source no:   3 RA (J2000):  96.71505 [degrees] = 06h 26m 51.61s Dec (J2000): -4.3578 [degrees] = -04d 21' 27.9" Error:       +4.7 [arcsec, 90% conf. radius] Count rate (0.3-10 keV): 0.0114 (+0.0036, -0.0030) ct s-1 Flux (0.3-10 keV):       4.9 (+1.5, -1.3) x 10-13 erg cm-2 s-1 Note: This is 3.3" from the SIMBAD object Cl* NGC 2232    CPK   18627 Source no:   7 RA (J2000):  96.28302 [degrees] = 06h 25m 07.93s Dec (J2000): -4.15135 [degrees] = -04d 09' 04.9" Error:       +8.0 [arcsec, 90% conf. radius] Count rate (0.3-10 keV): 9 (+5, -4) x 10-3 ct s-1 Flux (0.3-10 keV):       3.8 (+2.1, -1.5) x 10-13 erg cm-2 s-1 Source no:   8 RA (J2000):  96.45055 [degrees] = 06h 25m 48.13s Dec (J2000): -4.51977 [degrees] = -04d 31' 11.2" Error:       +3.0 [arcsec, 90% conf. radius] Count rate (0.3-10 keV): 0.049 (±0.011) ct s-1 Flux (0.3-10 keV):       2.1 (±0.5) ×10-12 erg cm-2 s-1 Note: This is 0.4" from the SIMBAD object Gaia DR2 3104506437197663232 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28516 SUBJECT: IceCube Alert 200926.94: Global MASTER-Net observations report DATE: 20/09/27 21:39:12 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the IceCube Alert 200926.94 (trigger No 41069485,12h 19m 00.00s , +32d 55m 48.0s, R=1.81) errorbox 50393 sec after notice time and 50557 sec after trigger time at 2020-09-27 12:38:06 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 77 deg. The sun altitude is -16.9 deg. The galactic latitude b = 81 deg., longitude l = 171 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1449850 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 50647 | 2020-09-27 12:38:06 | MASTER-Tunka | (12h 35m 32.98s , +32d 25m 36.7s) | C | 180 | 12.8 | 81373 | 2020-09-27 21:11:12 | MASTER-Tunka | (12h 27m 03.60s , +33d 47m 34.1s) | C | 60 | 16.8 | 82175 | 2020-09-27 21:24:33 | MASTER-Tunka | (12h 13m 31.51s , +29d 47m 44.2s) | C | 60 | 16.7 | 82339 | 2020-09-27 21:27:18 | MASTER-Tunka | (12h 29m 10.01s , +31d 47m 54.7s) | C | 60 | 16.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28523 SUBJECT: IceCube-200926A: Upper limits from a search for additional neutrino events in IceCube DATE: 20/09/28 16:02:22 GMT FROM: Alex Pizzuto at ICECUBE/U of Wisconsin The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search for additional track-like muon neutrino events arriving from the direction of IceCube-200926A (https://gcn.gsfc.nasa.gov/gcn3/28504.gcn3) in a time range of 2 days centered on the alert event time (2020-09-25 07:54:11.62 UTC to 2020-09-27 07:54:11.62 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero additional track-like events are found in spatial coincidence with the 90% containment region of IceCube-200926A. We accordingly derive a time-integrated muon-neutrino flux upper limit at the alert position of E^2 dN/ dE = 3.6 x 10^-5 TeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are approximately between 2 TeV and 7 PeV. A subsequent search was performed to include the month of data prior to the alert event (2020-08-27 07:54:11.62 UTC to 2020-09-27 07:54:11.62 UTC). In this case, we report a p-value of 1.0, consistent with no significant excess of track-like events, and a corresponding time-integrated muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2 dN/dE) of 4.3 x 10^-5 TeV cm^-2 at the 90% CL. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28528 SUBJECT: IceCube-200926A: No significant detection in HAWC DATE: 20/09/29 18:52:48 GMT FROM: Hugo Ayala at Pennsylvania State University Hugo Ayala (Penn State) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 2020-09-26 22:35:29 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-200926A. Location is at RA: 96.46 (+ 0.73 - 0.55 deg 90% PSF containment) J2000 Dec: -4.33 (+ 0.61 - 0.76 deg 90% PSF containment) J2000 (GCN circular 28504). We performed two types of analyses for the follow-up. The first is for a steady source in archival data and the second is a search for a transient source. We assume a power-law spectrum with an index of -2.3 for both analyses. Search for a steady source in archival data: The archival data spans from November 2014 to June 2019. We searched inside the reported IceCube error region. The most significant location, with p-value 2.07e-02 (1.70e-01 post-trials), is at RA 97.08 deg, Dec -3.73 deg (±0.26 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit on gamma rays at the maximum position of: E^2 dN/dE = 2.64e-13 (E/TeV)^-0.3 TeV.cm^-2.s^-1 Search for a transient source. Since the event was not in our field of view at the time reported, we report the combined result for the transits before and after the IceCube event. Data acquisition started on 2020/09/24 15:08:36 UTC and ended 2020/09/26 15:23:21 UTC. The most significant location, with p-value 7.49e-02 (5e-1 post-trials), is at RA 96.28 deg, Dec -4.18 deg (±2.37 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE = 1.25e-11 (E/TeV)^-0.3 TeV.cm^-2.s^-1 HAWC is a very-high-energy gamma-ray observatory operating in Central Mexico at latitude 19 deg. north. Operating day and night with over 95% duty cycle, HAWC has an instantaneous field of view of 2 sr and surveys 2/3 of the sky every day. It is sensitive to gamma rays from 300 GeV to 100 TeV. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28530 SUBJECT: IceCube-200926A: Upper limits from Fermi-GBM Observations DATE: 20/09/29 19:51:21 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM team: For the IceCube high-energy neutrino candidate event IceCube-200926A (GCN 28504), at the event time Fermi-GBM was observing the reported neutrino location at: RA: 96.46 (+ 0.73 - 0.55 deg 90% PSF containment) J2000 Dec: -4.33 (+ 0.61 - 0.76 deg 90% PSF containment) J2000 There was no Fermi-GBM onboard trigger around the event time of the neutrino candidate. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around the neutrino candidate time. From this search, no significant signal was found related to IceCube-200926A. We set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV (in units of 10^-7 erg/s/cm^2): Timescale Soft Normal Hard ------------------------------------------- 0.128 s: 7.1 9.7 17. 1.024 s: 2.3 3.4 5.9 8.192 s: 1.0 1.5 2.6 These results are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28547 SUBJECT: IceCube-200926A: JCMT/SCUBA2 observations DATE: 20/10/02 08:19:50 GMT FROM: Yuji Urata at Nat. Central U. Y. Urata (NCU) and K. Huang (CYCU) We observed the field of IceCube-200926A (GCN 28532) using SCUAB-2 attached to JCMT. The observation was started at 2020/09/28 13:21 UTC and SCUBA2 imaged the field centered at RA 06:25:50 Dec -4:19:48 with 50 arcmin diameter. We could not find any sources on the 850um image with the final map noise of 4.5 mJy. We thanks staffs of East Asian Observatory. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28551 SUBJECT: IceCube-200926A: No candidate counterparts from the Zwicky Transient Facility DATE: 20/10/02 15:05:40 GMT FROM: Robert Stein at DESY Sven Weimann (Ruhr University Bochum), Robert Stein (DESY), Simeon Reusch (DESY) and Anna Franckowiak (DESY/Ruhr University Bochum) report, On behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations: We observed the localization region of the neutrino event IceCube-200929A (Lagunas et. al, GCN 28532) with the Palomar 48-inch telescope, equipped with the 47 square degree ZTF camera (Bellm et al. 2019, Graham et al. 2019). We started observations in the g-band and r-band beginning at 2020-09-30T07:53:51.850 UTC, approximately 14.1 hours after event time. We covered 0.9 sq deg, corresponding to 88.72% of the reported localization region. This estimate accounts for chip gaps. Each exposure was 300s with a typical depth of 21.0 mag. The images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019; Stein et al. 2020) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019). We looked for high-significance transient candidates with our pipeline, lying within the 90.0% localization of the skymap. No counterpart candidates were detected. ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019). Alert filtering is performed with the AMPEL Follow-up Pipeline (Stein et al. 2020). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28554 SUBJECT: IceCube-200926A: No usable INTEGRAL data DATE: 20/10/03 12:18:07 GMT FROM: Volodymyr Savchenko at ISDC,U of Geneve V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland) J. Rodi (IAPS-Roma, Italy) A. Coleiro (APC, France) S. Mereghetti (INAF IASF-Milano, Italy) on behalf of the INTEGRAL multi-messenger collaboration: https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration At the time of the event (2020-09-26 07:54:11 UTC, hereafter T0), INTEGRAL was nearing the end of orbit, and although the data is available, the excess variance due to local background environment was extreme (excess variance 54), preventing search for any but the most intense counterparts, which would have been clearly detected by other instruments. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28586 SUBJECT: IceCube-200926A: Upper limits from Insight-HXMT Observations DATE: 20/10/09 06:14:34 GMT FROM: Donglian Xu at Tsung-Dao Lee Institute Yu-Ling Chang (TDLI), Jinyuan Liao (IHEP), Chen Wang (NAOC), Yi Nang (IHEP), Na Sai (IHEP), Youli Tuo (IHEP), Ju Guan (IHEP), Chengkui Li (IHEP), Yuan Liu (NAOC), Jianyin Nie (IHEP), Donglian Xu (TDLI), Marcos Santander (U. Alabama), Wenlian Li (TDLI), Lian Tao (IHEP), Shijie Zheng (IHEP), Shaolin Xiong (IHEP), Shuangnan Zhang (IHEP), report on behalf of the TDLI and Insight-HXMT teams Insight-HXMT observed the field of IceCube-200926A (GCN Circ. 28504) from 01:34:59 UTC September 29, 2020 to 10:49:34 UTC October 1, 2020 collecting a total of 8-epoch of data spanning ~2.5 days. The observations were done with small-sky scan mode with a scanning radius ~7 degrees and a total observation time of 20 ks. We searched for emission from a new X-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission in all three bands, LE, ME, and HE of Insight-HXMT, at the IceCube-200926A best-fit position. Assuming an absorbed power-law spectrum (photon power-law index = 1.9 and nH column density = 3.14e21 fixed) for a point source at the position of this neutrino event, the 5-sigma flux upper-limits are reported below: LE Band (1-6 keV): 6.2e-11 erg cm^-2 s^-1 ME Band (7-40 keV): 2.5e-10 erg cm^-2 s^-1 HE Band (25-100 keV): 1.1e-10 erg cm^-2 s^-1 All measurements above are made with the NaI detectors operating in the regular mode with the energy range of about 1-250 keV (record energy). Insight-HXMT is the first Chinese space X-ray telescope, which was fundedjointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information could be found at: http://www.hxmt.org.