//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28815 SUBJECT: GRB 201031B: Fermi GBM Final Real-time Localization DATE: 20/10/31 18:01:39 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 17:51:24 UT on 31 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201031B (trigger 625859489.53606 / 201031744). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 44.2, Dec = 54.9 (J2000 degrees, equivalent to J2000 02h 56m, 54d 53'), with a statistical uncertainty of 4.0 degrees. The angle from the Fermi LAT boresight is 16.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201031744/quicklook/glg_skymap_all_bn201031744.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/bn201031744/quicklook/glg_healpix_all_bn201031744.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201031744/quicklook/glg_lc_medres34_bn201031744.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28816 SUBJECT: GRB 201031B: BALROG localization (Fermi Trigger 625859489 / GRB 201031744) DATE: 20/10/31 18:25:47 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 625859489 at 17:51:24 on 31 Oct. 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) = 47.9+/-6.1 deg Decl.(2000.0) = 42.0+/-6.2 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB201031744/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB201031744/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB201031744/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28817 SUBJECT: Fermi GRB 201031B: Global MASTER-Net observations report DATE: 20/10/31 21:30:36 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-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB 201031B ( Fermi GBM team, GCN 28815) errorbox 9553 sec after notice time and 9640 sec after trigger time at 2020-10-31 20:32:04 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 53 deg. The sun altitude is -29.8 deg. The galactic latitude b = -3 deg., longitude l = 141 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1473043 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9670 | 2020-10-31 20:32:04 | MASTER-IAC | (02h 28m 29.48s , +51d 55m 57.7s) | C | 60 | 16.8 | 9750 | 2020-10-31 20:33:24 | MASTER-IAC | (02h 41m 30.02s , +51d 57m 11.9s) | C | 60 | 16.7 | 10166 | 2020-10-31 20:40:20 | MASTER-IAC | (02h 54m 30.92s , +51d 55m 46.5s) | C | 60 | 16.7 | 10257 | 2020-10-31 20:41:51 | MASTER-IAC | (03h 05m 47.75s , +51d 56m 15.9s) | C | 60 | 16.7 | 10509 | 2020-10-31 20:46:03 | MASTER-IAC | (02h 41m 34.50s , +51d 56m 15.3s) | C | 60 | 16.7 | 10777 | 2020-10-31 20:50:31 | MASTER-IAC | (03h 05m 43.26s , +51d 56m 35.1s) | C | 60 | 16.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.