//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31237 SUBJECT: GRB 211216A: Fermi GBM Final Real-time Localization DATE: 21/12/16 06:57:07 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 06:45:52 UT on 16 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211216A (trigger 661329957.05626 / 211216282). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 44.4, Dec = -64.3 (J2000 degrees, equivalent to J2000 02h 57m, -64d 17'), with a statistical uncertainty of 1.1 degrees. The angle from the Fermi LAT boresight is 31.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211216282/quicklook/glg_skymap_all_bn211216282.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/bn211216282/quicklook/glg_healpix_all_bn211216282.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211216282/quicklook/glg_lc_medres34_bn211216282.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31238 SUBJECT: Fermi GRB 211216A: Global MASTER-Net observations report DATE: 21/12/16 07:15:07 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (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 211216A ( Fermi GBM team, GCN 31237) errorbox 2 sec after trigger time at 2021-12-16 06:45:54 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 56 deg. The sun altitude is -26.7 deg. The galactic latitude b = -48 deg., longitude l = 283 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1816175 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 12 | 2021-12-16 06:45:54 | MASTER-OAFA | (02h 53m 22.27s , -62d 10m 10.3s) | C | 20 | 17.1 | 57 | 2021-12-16 06:45:54 | MASTER-OAFA | (02h 53m 22.27s , -62d 10m 10.4s) | C | 110 | 17.7 | Coadd 57 | 2021-12-16 06:46:33 | MASTER-OAFA | (03h 00m 27.56s , -62d 56m 56.5s) | C | 30 | 17.2 | 111 | 2021-12-16 06:47:23 | MASTER-OAFA | (02h 53m 25.66s , -62d 10m 21.1s) | C | 40 | 16.5 | 176 | 2021-12-16 06:48:23 | MASTER-OAFA | (02h 53m 18.92s , -62d 10m 50.7s) | C | 50 | 17.3 | 253 | 2021-12-16 06:49:35 | MASTER-OAFA | (02h 53m 18.87s , -62d 09m 50.3s) | C | 60 | 17.6 | 420 | 2021-12-16 06:52:22 | MASTER-OAFA | (02h 40m 59.42s , -62d 49m 23.1s) | C | 60 | 17.7 | 499 | 2021-12-16 06:53:41 | MASTER-OAFA | (02h 58m 51.51s , -62d 47m 34.8s) | C | 60 | 17.7 | 614 | 2021-12-16 06:55:01 | MASTER-OAFA | (02h 57m 39.11s , -63d 45m 40.4s) | C | 130 | 18.4 | 778 | 2021-12-16 06:57:30 | MASTER-OAFA | (02h 57m 41.60s , -63d 44m 08.1s) | C | 160 | 18.4 | 968 | 2021-12-16 07:00:29 | MASTER-OAFA | (02h 57m 35.23s , -63d 45m 07.3s) | C | 180 | 18.5 | 1167 | 2021-12-16 07:03:49 | MASTER-OAFA | (02h 57m 36.92s , -63d 44m 08.1s) | C | 180 | 18.5 | 1367 | 2021-12-16 07:07:08 | MASTER-OAFA | (02h 57m 42.14s , -63d 45m 07.7s) | C | 180 | 18.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31239 SUBJECT: GRB 211216A: BALROG localization (Fermi Trigger 661329957 / GRB 211216282) DATE: 21/12/16 07:22:31 GMT FROM: Jochen Greiner at MPE,Garching B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 661329957 at 06:45:52 on 16 Dec. 2021 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position (1 sigma statistical errors) is: RA(2000.0) = 51.0+/-2.4 deg Decl.(2000.0) = -62.2+/-4.0 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB211216282/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB211216282/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB211216282/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31240 SUBJECT: GRB 211216A: GECAM detection DATE: 21/12/16 08:22:21 GMT FROM: Wangchen Xue at IHEP W. C. Xue, S. Xiao, 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, 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: During the commissioning phase, GECAM-B was triggered in-flight by a long burst, GRB 211216A, at 2021-12-16T06:45:56.050 UTC (denoted as T0), which was also observed by Fermi/GBM (GCN #31237). GECAM alert data was downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS) within ~60 s after T0. According to the BDS alert data, this burst mainly consists of a broad pulse with a duration of about 20 s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_93336356.png Using the automatic on-ground localization pipeline with the BDS alert data, GECAM-B localized this burst to the following position (J2000): Ra: 57.22 deg Dec: -63.04 deg Err: 5.71 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. GECAM location is consistent with the Fermi/GBM position within the error. 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: 31250 SUBJECT: GRB 211216A: Swift/BAT-GUANO detection outside the coded FOV DATE: 21/12/17 03:15:52 GMT FROM: Aaron Tohuvavohu at U Toronto Aaron Tohuvavohu (U Toronto), James DeLaunay (UAlabama), Gayathri Raman (PSU), Jamie A. Kennea (PSU), report: Swift/BAT did not localize GRB 211216A (T0: 2021-12-16T06:45:52 UTC, Fermi/GBM GCN 31237, GECAM GCN 31240, BALROG GCN 31239, INTEGRAL/SPI-ACS trig #9564). The Fermi, INTEGRAL, and GECAM notices, 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 11.2 in a 8.192 s analysis time bin. NITRATES results are consistent with a burst coming from outside the coded FOV, with DeltaLLHOut of 6. An out of FOV origin is consistent with the Fermi/GBM RoboBA, GECAM, and BALROG localizations. 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: 31263 SUBJECT: GRB 211216A: Fermi GBM observation DATE: 21/12/18 09:27:56 GMT FROM: Elisabetta Bissaldi at INFN,Bari E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 06:45:52.06 UT on 16 December 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 211216A (trigger 661329957 / 211216282), which was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. 2021, GCN 31250) and by GECAM-B (Xue et al. 2021, GCN 31240). The GBM on-ground location is reported in GCN 31237. The GBM light curve shows a FRED-like emission episode with a duration (T90) of about 20 s (50-300 keV). The time-averaged spectrum from T0 to T0+20 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.47 +/- 0.05 and the cutoff energy, parameterized as Epeak, is 208 +/- 7 keV. The event fluence (10-1000 keV) in this time interval is (9.16 +/- 0.02)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+6.3 s in the 10-1000 keV band is 5.4 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"