//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27870 SUBJECT: GRB 200531A: Fermi GBM Final Real-time Localization DATE: 20/05/31 03:01:39 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 02:51:18 UT on 31 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200531A (trigger 612586283.524172 / 200531119). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 164.6, Dec = 31.9 (J2000 degrees, equivalent to J2000 10h 58m, 31d 53'), with a statistical uncertainty of 8.1 degrees. The angle from the Fermi LAT boresight is 124.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200531119/quicklook/glg_skymap_all_bn200531119.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/bn200531119/quicklook/glg_healpix_all_bn200531119.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200531119/quicklook/glg_lc_medres34_bn200531119.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27874 SUBJECT: Fermi GRB 200531A: Global MASTER-Net observations report DATE: 20/05/31 18:00:34 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), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), 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 200531A ( Fermi GBM team, GCN 27870) errorbox 52660 sec after notice time and 52687 sec after trigger time at 2020-05-31 17:29:26 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 69 deg. The sun altitude is -22.2 deg. The galactic latitude b = 66 deg., longitude l = 196 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1369918 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 52718 | 2020-05-31 17:29:26 | MASTER-SAAO | (10h 46m 11.37s , +36d 08m 43.4s) | C | 60 | 18.7 | 52718 | 2020-05-31 17:29:26 | MASTER-SAAO | (10h 45m 11.52s , +36d 07m 55.3s) | C | 60 | 18.6 | 52798 | 2020-05-31 17:30:46 | MASTER-SAAO | (10h 56m 10.98s , +36d 07m 51.0s) | C | 60 | 18.7 | 52798 | 2020-05-31 17:30:46 | MASTER-SAAO | (10h 55m 11.16s , +36d 07m 03.0s) | C | 60 | 18.6 | 52877 | 2020-05-31 17:32:05 | MASTER-SAAO | (11h 13m 35.60s , +38d 07m 06.9s) | C | 60 | 18.5 | 52877 | 2020-05-31 17:32:06 | MASTER-SAAO | (11h 12m 34.34s , +38d 06m 19.5s) | C | 60 | 18.6 | 52957 | 2020-05-31 17:33:25 | MASTER-SAAO | (11h 11m 12.09s , +40d 07m 43.2s) | C | 60 | 18.3 | 52957 | 2020-05-31 17:33:25 | MASTER-SAAO | (11h 02m 13.47s , +40d 06m 17.2s) | C | 60 | 18.6 | 53245 | 2020-05-31 17:38:13 | MASTER-SAAO | (10h 56m 05.86s , +36d 06m 51.1s) | C | 60 | 18.4 | 53245 | 2020-05-31 17:38:13 | MASTER-SAAO | (10h 55m 07.12s , +36d 06m 10.8s) | C | 60 | 18.6 | 53325 | 2020-05-31 17:39:33 | MASTER-SAAO | (11h 11m 12.29s , +40d 08m 48.9s) | C | 60 | 18.0 | 53325 | 2020-05-31 17:39:33 | MASTER-SAAO | (11h 02m 13.42s , +40d 07m 25.0s) | C | 60 | 18.4 | 53405 | 2020-05-31 17:40:53 | MASTER-SAAO | (11h 23m 02.23s , +40d 07m 03.9s) | C | 60 | 18.3 | 53485 | 2020-05-31 17:42:13 | MASTER-SAAO | (10h 35m 25.66s , +36d 09m 00.6s) | C | 60 | 18.3 | 53485 | 2020-05-31 17:42:13 | MASTER-SAAO | (10h 26m 55.17s , +36d 07m 35.4s) | C | 60 | 18.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.