September 2021 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 28700] IPN triangulation of a bright burst from SGR 1935+2154
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30803 SUBJECT: IPN triangulation of a bright burst from SGR 1935+2154 DATE: 21/09/10 20:59:57 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A. Ridnaia, S. Golenetskii, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi-GBM team, and S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report: A bright, short-duration, soft burst has been observed by Fermi (GBM), Konus-Wind, and Swift (BAT), so far, at about 2747 s UT (00:45:47) on September 10. The burst was outside the coded field of view of the BAT. We have triangulated it to a Konus-GBM annulus centered at RA(2000)=326.594 deg (21h 46m 22s) Dec(2000)=-14.741 deg (-14d 44' 28"), whose radius is 48.801 +/- 0.199 deg (3 sigma). This localization may be improved. The position of SGR 1935+2154 lies inside the annulus at 0.7 arcmin from its center line. Given the positional coincidence of this burst with SGR 1935+2154, its time history, softness of its spectrum (as observed by Konus-Wind), and reported bursting activity (Xiao et al., GCN Circ. 30797), we conclude this burst is likely originated from SGR 1935+2154. A triangulation map is posted at http://www.ioffe.ru/LEA/SGRs/210910_T02750/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars.

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[vsnet-grb-info 28699] Fermi trigger No 652957973: Global MASTER-Net observations report
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30802 SUBJECT: Fermi trigger No 652957973: Global MASTER-Net observations report DATE: 21/09/10 19:30:21 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB210910.38 (trigger No 652957973,19h 58m 12.00s , +35d 33m 00.0s, R=8.86) errorbox 34681 sec after notice time and 34729 sec after trigger time at 2021-09-10 18:51:38 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 12 deg. The sun altitude is -33.2 deg. The galactic latitude b = 3 deg., longitude l = 72 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1716266 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 34760 | 2021-09-10 18:51:38 | MASTER-Kislovodsk | (20h 21m 50.58s , +33d 30m 20.3s) | C | 60 | 18.5 | 34760 | 2021-09-10 18:51:38 | MASTER-Kislovodsk | (20h 16m 27.89s , +33d 53m 42.0s) | C | 60 | 18.9 | 34840 | 2021-09-10 18:52:59 | MASTER-Kislovodsk | (20h 16m 44.97s , +39d 13m 54.2s) | C | 60 | 18.0 | 34840 | 2021-09-10 18:52:59 | MASTER-Kislovodsk | (20h 10m 55.05s , +39d 37m 17.3s) | C | 60 | 18.5 | 34920 | 2021-09-10 18:54:19 | MASTER-Kislovodsk | (20h 23m 28.65s , +37d 19m 10.2s) | C | 60 | 18.4 | 34920 | 2021-09-10 18:54:19 | MASTER-Kislovodsk | (20h 17m 47.95s , +37d 42m 26.7s) | C | 60 | 18.6 | 35000 | 2021-09-10 18:55:39 | MASTER-Kislovodsk | (19h 24m 23.96s , +43d 01m 49.5s) | C | 60 | 17.9 | 35080 | 2021-09-10 18:56:59 | MASTER-Kislovodsk | (20h 10m 55.05s , +41d 07m 08.3s) | C | 60 | 17.8 | 35080 | 2021-09-10 18:56:59 | MASTER-Kislovodsk | (20h 04m 54.00s , +41d 30m 24.6s) | C | 60 | 18.4 | 35240 | 2021-09-10 18:59:39 | MASTER-Kislovodsk | (20h 31m 22.55s , +35d 24m 35.7s) | C | 60 | 18.4 | 35240 | 2021-09-10 18:59:39 | MASTER-Kislovodsk | (20h 25m 51.15s , +35d 47m 58.7s) | C | 60 | 19.2 | 35933 | 2021-09-10 19:11:11 | MASTER-Kislovodsk | (20h 21m 46.95s , +33d 30m 05.8s) | C | 60 | 18.5 | 35933 | 2021-09-10 19:11:11 | MASTER-Kislovodsk | (20h 16m 24.61s , +33d 53m 23.0s) | C | 60 | 18.8 | 36013 | 2021-09-10 19:12:31 | MASTER-Kislovodsk | (20h 16m 43.83s , +39d 12m 08.3s) | C | 60 | 18.0 | 36013 | 2021-09-10 19:12:32 | MASTER-Kislovodsk | (20h 10m 54.49s , +39d 35m 25.4s) | C | 60 | 18.4 | 36093 | 2021-09-10 19:13:52 | MASTER-Kislovodsk | (20h 23m 30.45s , +37d 19m 53.5s) | C | 60 | 18.3 | 36093 | 2021-09-10 19:13:52 | MASTER-Kislovodsk | (20h 17m 50.20s , +37d 43m 05.2s) | C | 60 | 18.5 | 36174 | 2021-09-10 19:15:12 | MASTER-Kislovodsk | (19h 24m 26.45s , +43d 00m 02.1s) | C | 60 | 17.9 | 36253 | 2021-09-10 19:16:32 | MASTER-Kislovodsk | (20h 10m 52.66s , +41d 08m 02.4s) | C | 60 | 17.7 | 36253 | 2021-09-10 19:16:32 | MASTER-Kislovodsk | (20h 04m 52.35s , +41d 31m 14.2s) | C | 60 | 18.3 | 36414 | 2021-09-10 19:19:12 | MASTER-Kislovodsk | (20h 31m 15.62s , +35d 26m 06.5s) | C | 60 | 18.3 | 36414 | 2021-09-10 19:19:12 | MASTER-Kislovodsk | (20h 25m 44.80s , +35d 49m 24.6s) | C | 60 | 19.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28698] Fermi trigger No 652944960: Global MASTER-Net observations report
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30801 SUBJECT: Fermi trigger No 652944960: Global MASTER-Net observations report DATE: 21/09/10 16:45:20 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB210910.23 (trigger No 652944960,20h 04m 52.80s , +25d 42m 36.0s, R=13.52) errorbox 38693 sec after notice time and 38736 sec after trigger time at 2021-09-10 16:21:31 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 37 deg. The sun altitude is -10.0 deg. The galactic latitude b = -3 deg., longitude l = 64 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1716045 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 38766 | 2021-09-10 16:21:31 | MASTER-Kislovodsk | (19h 49m 58.37s , +10d 51m 32.6s) | C | 60 | 15.8 | 38766 | 2021-09-10 16:21:31 | MASTER-Kislovodsk | (19h 54m 29.27s , +10d 26m 44.5s) | C | 60 | 16.7 | 39167 | 2021-09-10 16:28:12 | MASTER-Kislovodsk | (19h 42m 34.95s , +12d 46m 23.7s) | C | 60 | 16.1 | 39167 | 2021-09-10 16:28:12 | MASTER-Kislovodsk | (19h 47m 08.01s , +12d 21m 42.0s) | C | 60 | 17.0 | 39408 | 2021-09-10 16:32:13 | MASTER-Kislovodsk | (19h 58m 09.20s , +12d 45m 21.7s) | C | 60 | 16.9 | 39408 | 2021-09-10 16:32:13 | MASTER-Kislovodsk | (20h 02m 41.75s , +12d 20m 37.5s) | C | 60 | 17.8 | 39488 | 2021-09-10 16:33:33 | MASTER-Kislovodsk | (20h 09m 50.61s , +10d 25m 29.7s) | C | 60 | 17.8 | 39488 | 2021-09-10 16:33:33 | MASTER-Kislovodsk | (20h 05m 20.49s , +10d 50m 19.2s) | C | 60 | 16.8 | 39728 | 2021-09-10 16:37:33 | MASTER-Kislovodsk | (19h 49m 54.56s , +10d 50m 54.3s) | C | 60 | 17.0 | 39728 | 2021-09-10 16:37:33 | MASTER-Kislovodsk | (19h 54m 25.09s , +10d 26m 09.6s) | C | 60 | 17.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28697] Fermi trigger No 652981861: Global MASTER-Net observations report
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30800 SUBJECT: Fermi trigger No 652981861: Global MASTER-Net observations report DATE: 21/09/10 16:30:36 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB210910.66 (trigger No 652981861,19h 50m 36.00s , +08d 45m 00.0s, R=5.4) errorbox 1717 sec after notice time and 1755 sec after trigger time at 2021-09-10 16:20:11 UT, with upper limit up to 17.0 mag. Observations started at twilight. The observations began at zenith distance = 38 deg. The sun altitude is -9.8 deg. The galactic latitude b = -9 deg., longitude l = 48 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1716539 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1785 | 2021-09-10 16:20:11 | MASTER-Kislovodsk | (19h 43m 04.74s , +08d 58m 41.6s) | C | 60 | 15.6 | 1785 | 2021-09-10 16:20:11 | MASTER-Kislovodsk | (19h 47m 34.00s , +08d 33m 50.5s) | C | 60 | 16.4 | 1865 | 2021-09-10 16:21:31 | MASTER-Kislovodsk | (19h 49m 58.37s , +10d 51m 32.6s) | C | 60 | 15.8 | 1865 | 2021-09-10 16:21:31 | MASTER-Kislovodsk | (19h 54m 29.27s , +10d 26m 44.5s) | C | 60 | 16.7 | 1945 | 2021-09-10 16:22:51 | MASTER-Kislovodsk | (19h 52m 58.65s , +07d 02m 33.5s) | C | 60 | 15.8 | 1945 | 2021-09-10 16:22:51 | MASTER-Kislovodsk | (19h 57m 25.85s , +06d 37m 37.0s) | C | 60 | 16.7 | 2025 | 2021-09-10 16:24:12 | MASTER-Kislovodsk | (19h 58m 33.52s , +08d 56m 30.9s) | C | 60 | 16.0 | 2025 | 2021-09-10 16:24:12 | MASTER-Kislovodsk | (20h 03m 02.11s , +08d 31m 37.0s) | C | 60 | 17.0 | 2105 | 2021-09-10 16:25:32 | MASTER-Kislovodsk | (19h 37m 42.96s , +07d 04m 29.7s) | C | 60 | 15.8 | 2105 | 2021-09-10 16:25:32 | MASTER-Kislovodsk | (19h 42m 10.56s , +06d 39m 34.2s) | C | 60 | 16.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28696] GRB 210826A: further Swift-XRT observations
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30799 SUBJECT: GRB 210826A: further Swift-XRT observations DATE: 21/09/10 15:32:21 GMT FROM: Paolo D'Avanzo at INAF-OAB <pda.davanzo(a)gmail.com> P. D'Avanzo, M. G. Bernardini, A. Melandri, T. Sbarrato (INAF-OAB), P. A. Evans (U. Leicester) report on behalf of the Swift team: Swift-XRT has performed further follow-up observations of GRB 210826A (Ohno et al. GCN Circ. 30721), collecting a total of 14.6 ks of Photon Counting (PC) mode data between T0+36.5 ks ks and T0+1.26e6 s. Of the 8 X-ray uncatalogued sources detected in the first observing epoch (D'Ai et al., GCN Circ. 30725), Source 1 and Source 5 are still detected with a consistent count-rate. The other sources are not detected down to a typical 3sigma upper limit of ~ 3e-3 ct/s. Therefore, we found no clear evidence for an X-ray afterglow candidate of GRB 210826A. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00101. This circular is an official product of the Swift-XRT team.

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[vsnet-grb-info 28695] GRB 210909B: GECAM detection
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30798 SUBJECT: GRB 210909B: GECAM detection DATE: 21/09/10 15:02:21 GMT FROM: Shuo Xiao at IHEP <xiaoshuo(a)ihep.ac.cn> 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 long burst, GRB 210909B, at 2021-09-09T20:02:33.600 UTC (denoted as T0), which was also detected by INTEGRAL/SPI-ACS. According to the GECAM-B light curves in about 15-3500 keV, this burst mainly consists of a broad pulse with a duration of about 10 s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/utn210909_200233_GECAMb.png GECAM-B localized this burst to the following position (J2000): Ra: 358.6 deg Dec: -74.9 deg Err: 1.1 deg (1-sigma, statistical only) The systematic error of location is estimated to be several degrees. 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).

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[vsnet-grb-info 28694] GECAM observations of a series of bursts from SGR J1935+2154
by GCN Circulars 10 Sep '21

10 Sep '21

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 <xiaoshuo(a)ihep.ac.cn> 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.

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[vsnet-grb-info 28693] Swift detection of a burst from SGR Swift J1555.2-5402
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30796 SUBJECT: Swift detection of a burst from SGR Swift J1555.2-5402 DATE: 21/09/10 10:31:17 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> N. J. Klingler (GSFC/UMBC/CRESSTII), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 10:11:55 on 2021-09-10 UT, the Swift Burst Alert Telescope (BAT) triggered and located a burst from the Soft Gamma Repeater Swift J1555.2-5402 (trigger=1072706). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 238.773, -54.055 which is RA(J2000) = 15h 55m 05s Dec(J2000) = -54d 03' 16" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single high bin at the 64 ms timescale, consistent with the 4 ms trigger duration. The peak count rate on the 64 ms timescale was ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 10:13:14.4 UT, 78.8 seconds after the BAT trigger. Using promptly downlinked data we find an X-ray source with an enhanced position: RA, Dec 238.78912, -54.06236 which is equivalent to: RA(J2000) = 15h 55m 09.39s Dec(J2000) = -54d 03' 44.5" with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 43 arcseconds from the BAT onboard position, within the BAT error circle, and consistent with the known position of Swift J1555.2-5402. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data does not constrain the column density. UVOT took a finding chart exposure of 150 seconds with the White filter starting 82 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain, extinction expected.

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[vsnet-grb-info 28692] Fermi trigger No 652934203: Global MASTER-Net observations report
by GCN Circulars 10 Sep '21

10 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30795 SUBJECT: Fermi trigger No 652934203: Global MASTER-Net observations report DATE: 21/09/10 07:31:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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 GRB210910.11 (trigger No 652934203,19h 14m 28.80s , +25d 57m 36.0s, R=16.78) errorbox 3 sec after trigger time at 2021-09-10 02:36:41 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 72 deg. The sun altitude is -52.5 deg. The galactic latitude b = 6 deg., longitude l = 59 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1715870 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 33 | 2021-09-10 02:36:41 | MASTER-OAFA | (19h 29m 08.82s , +36d 32m 41.8s) | C | 60 | 17.5 | 113 | 2021-09-10 02:38:01 | MASTER-OAFA | (19h 49m 25.16s , +30d 52m 15.4s) | C | 60 | 16.6 | 192 | 2021-09-10 02:39:20 | MASTER-OAFA | (19h 58m 48.36s , +30d 50m 33.4s) | C | 60 | 16.9 | 272 | 2021-09-10 02:40:40 | MASTER-OAFA | (19h 47m 24.95s , +13d 46m 00.4s) | C | 60 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28691] GECAM observation of a burst from SGR J1935+2154
by GCN Circulars 10 Sep '21

10 Sep '21

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 <xiaoshuo(a)ihep.ac.cn> 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).

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