//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28935 SUBJECT: GRB 201121A: Fermi GBM Final Real-time Localization DATE: 20/11/21 01:40:04 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 01:29:49 UT on 21 Nov 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201121A (trigger 627614994.006474 / 201121062). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 210.8, Dec = -27.9 (J2000 degrees, equivalent to J2000 14h 03m, -27d 53'), with a statistical uncertainty of 2.6 degrees. The angle from the Fermi LAT boresight is 77.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201121062/quicklook/glg_skymap_all_bn201121062.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201121062/quicklook/glg_healpix_all_bn201121062.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201121062/quicklook/glg_lc_medres34_bn201121062.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28936 SUBJECT: GRB 201121A: BALROG localization (Fermi Trigger 627614994 / GRB 201121062) DATE: 20/11/21 01:49:50 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 627614994 at 01:29:49 on 21 Nov. 2020 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) = 212.11+/-1.14 deg Decl.(2000.0) = -25.44+/-1.07 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB201121062/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB201121062/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB201121062/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28938 SUBJECT: Fermi GRB 201121A: Global MASTER-Net observations report DATE: 20/11/21 04:30:09 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 201121A ( Fermi GBM team, GCN 28935) errorbox 663 sec after notice time and 719 sec after trigger time at 2020-11-21 01:41:48 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 84 deg. The sun altitude is -19.8 deg. The galactic latitude b = 32 deg., longitude l = 322 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1486547 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 790 | 2020-11-21 01:41:48 | MASTER-SAAO | (13h 47m 06.60s , -27d 51m 18.4s) | C | 140 | 16.9 | 964 | 2020-11-21 01:44:28 | MASTER-SAAO | (13h 47m 11.79s , -27d 51m 18.3s) | C | 170 | 16.9 | 1159 | 2020-11-21 01:47:37 | MASTER-SAAO | (13h 47m 06.55s , -27d 49m 47.6s) | C | 180 | 16.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28954 SUBJECT: GRB 201121A: Insight-HXMT/HE detection DATE: 20/11/26 15:32:16 GMT FROM: Y Q Zhang at IHEP Y. Q. Zhang, C. Zheng, C. Cai, J. C. Liu, Q. Luo, S. Xiao, W. C. Xue, Q. B. Yi, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, X. Y. Song, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: At 2020-11-21T01:29:49.01 (T0), Insight-HXMT/HE detected GRB 201121A (trigger ID: HEB201121062) in a routine search of the data, which also triggered Fermi/GBM (Fermi GBM team, GCN #28935). The Insight-HXMT/HE light curve mainly consists of a single pulse with a duration (T90) of 5.47 s measured from T0-0.84 s. The 1-ms peak rate, measured from T0+0.30 s, is 487 cnts/sec. The total counts from this burst is 2001 counts. URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB201121062_lc.jpg All measurements above are made with the CsI detectors operating in the GRB mode with the energy range of about 200-3000 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.