//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31044 SUBJECT: GRB 211105A: AGILE detection of a burst DATE: 21/11/05 10:06:12 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi, E. Menegoni (INAF/IAPS), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, L. Foffano, G. Piano (INAF/IAPS), F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, A. Di Piano, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team: The AGILE satellite detected the long GRB 211105A at T0 = 2021-11-05 04:36:04 s (UTC). The burst is clearly visible in the AGILE scientific ratemeters of the SuperAGILE (SA; 20-60 keV) and MiniCALorimeter (MCAL; 0.4-100 MeV) detectors. The event lasted about 100 s and it released a total number of 14900 counts in the SA detector (above a background rate of 105 Hz) and 133500 counts in the MCAL detector (above a background rate of 1240 Hz). The AGILE ratemeter light curves can be found at http://www.agilescienceapp.it/notices/GRB211105A_AGILE_RM.png Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31046 SUBJECT: GRB 211105A: GECAM detection DATE: 21/11/06 01:59:33 GMT FROM: Guoying Zhao at IHEP G. Y. Zhao, C. W. Wang, S. Xiao, Yi Zhao, S. L. Xiong, C. Cai, J. J. He, Y. Huang, Z. W. Guo, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, P. Wang, S. L. Xie, W. C. Xue, Q. B. Yi, Y. Q. Zhang, X. Y. Zhao, C. Zheng, Y. Q. Du, D. Y. Guo, 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: During the commissioning phase, GECAM-B was triggered in-flight by a long bright burst, GRB 211105A, at 2021-11-05T04:35:20.200 UTC (denoted as 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 BDS alert data, this burst mainly consists of multiple pulses with duration of about 100 s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_16-25-24_89786120.png GECAM-B localized this burst to the following position (J2000): Ra: 81.93 deg Dec: -57.38 deg Err: 1.27 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. The GECAM preliminary location could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_skymap_bdm_89786120_V01.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: 31047 SUBJECT: GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV DATE: 21/11/06 02:15:09 GMT FROM: Aaron Tohuvavohu at U Toronto James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), report: Swift/BAT did not trigger on GRB 211105A (T0: 2021-11-05T04:35:20.2 UTC, GECAM-B GCN #31046). The GECAM notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu, arXiv:2111.01769), detects the burst with a sqrt(TS) of 16 in a 16.384 s analysis time bin. This is the maximum test duration of the search pipeline. The full burst duration in the detector is greater than 60 s. NITRATES prefers an origin for this burst coming from outside the coded FOV, with DeltaLLHOut of -4. An out of FOV origin is consistent with the GECAM localization. See Section 9.1 and Figure 20 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31048 SUBJECT: GRB 211105A: MASTER optical inspection DATE: 21/11/06 09:54:37 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E.Gorbovskoy, K.Zhirkov, N.Tiurina, P.Balanutsa, A.Kuznetsov, O.Gress,G.Antipov, D. Vlasenko, V.Senik,V.Topolev, A.Chasovnikov, E.Minkina, V.Grinshpun, D.Cheryasov (Lomonosov MSU,SAI,PhysicsDepartment), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), N.M. Budnev (Irkutsk State University, API), C.Francile, R. Podesta, F. Podesta (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) MASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L) started inspect of GECAM GRB 211105A (Zhao et al. GCN 31046, R.A.Dec(2000)=81.93,-57.38 +-1.27d; Ttrigger=2021-11-05T 04:35:20.200 UT, Tnotice=2021-11-06 01:59:33UT) by MASTER-OAFA (Argentina) at 2021-11-06 07:10:26UT (1 day 9306s after trigger time) with upper limit up to 19.7 mag. The observations began at zenith distance = 26 deg. The sun altitude is -27.4 deg. The galactic latitude b = -34 deg., longitude l = 266 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1777102 We obtained the following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment 95796 | 2021-11-06 07:10:26 | MASTER-OAFA | (05h 24m 16.75s , -56d 44m 09.4s) | C | 180 | 18.5 | 95996 | 2021-11-06 07:13:46 | MASTER-OAFA | (05h 24m 22.29s , -56d 44m 03.5s) | C | 180 | 18.8 | 96176 | 2021-11-06 07:13:46 | MASTER-OAFA | (05h 24m 22.29s , -56d 44m 03.5s) | C | 540 | 19.7 | Coadd 96196 | 2021-11-06 07:17:05 | MASTER-OAFA | (05h 24m 18.69s , -56d 42m 43.7s) | C | 180 | 18.8 | 96395 | 2021-11-06 07:20:25 | MASTER-OAFA | (05h 24m 18.52s , -56d 44m 01.5s) | C | 180 | 18.8 | 96595 | 2021-11-06 07:23:44 | MASTER-OAFA | (05h 24m 21.21s , -56d 42m 41.0s) | C | 180 | 18.9 | 96775 | 2021-11-06 07:23:44 | MASTER-OAFA | (05h 24m 21.21s , -56d 42m 41.0s) | C | 540 | 19.7 | Coadd 96794 | 2021-11-06 07:27:04 | MASTER-OAFA | (05h 24m 15.79s , -56d 43m 26.0s) | C | 180 | 18.9 | 96993 | 2021-11-06 07:30:23 | MASTER-OAFA | (05h 24m 14.75s , -56d 42m 26.5s) | C | 180 | 18.9 | 97193 | 2021-11-06 07:33:43 | MASTER-OAFA | (05h 24m 21.18s , -56d 43m 26.8s) | C | 180 | 19.0 | Filter C is a clear (unfiltred) band. The observation and reduction will be continued The message may be cited.