//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28712 SUBJECT: GRB 201021A: Fermi GBM Final Real-time Localization DATE: 20/10/21 02:50:20 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 02:39:55 UT on 21 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201021A (trigger 624940800.414594 / 201021111). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 174.4, Dec = -2.0 (J2000 degrees, equivalent to J2000 11h 37m, -2d 00'), with a statistical uncertainty of 2.5 degrees. The angle from the Fermi LAT boresight is 91.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201021111/quicklook/glg_skymap_all_bn201021111.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/bn201021111/quicklook/glg_healpix_all_bn201021111.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201021111/quicklook/glg_lc_medres34_bn201021111.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28728 SUBJECT: MAXI GRB201021.68: Global MASTER-Net observations report DATE: 20/10/21 20:17:21 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 MAXI GRB201021.68 (trigger No 143544224,00h 14m 16.08s , -63d 29m 31.2s, R=1) errorbox 9280 sec after notice time and 13381 sec after trigger time at 2020-10-21 20:02:07 UT, with upper limit up to 20.2 mag. The observations began at zenith distance = 33 deg. The sun altitude is -35.3 deg. The galactic latitude b = -53 deg., longitude l = 309 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1466520 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 13471 | 2020-10-21 20:02:07 | MASTER-SAAO | (00h 15m 17.20s , -63d 33m 50.4s) | C | 180 | 19.9 | 13471 | 2020-10-21 20:02:07 | MASTER-SAAO | (00h 13m 23.07s , -63d 34m 18.3s) | C | 180 | 19.8 | 13671 | 2020-10-21 20:05:27 | MASTER-SAAO | (00h 15m 23.28s , -63d 34m 57.6s) | C | 180 | 20.1 | 13671 | 2020-10-21 20:05:27 | MASTER-SAAO | (00h 13m 29.09s , -63d 35m 25.1s) | C | 180 | 19.9 | 13871 | 2020-10-21 20:08:46 | MASTER-SAAO | (00h 15m 17.91s , -63d 36m 02.6s) | C | 180 | 20.2 | 13871 | 2020-10-21 20:08:46 | MASTER-SAAO | (00h 13m 23.46s , -63d 36m 29.5s) | C | 180 | 20.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28731 SUBJECT: Swift GRB201021.85: Global MASTER-Net observations report DATE: 20/10/21 20:40:30 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) was pointed to the Swift GRB201021.85 (trigger No 1001130,00h 50m 12.00s , -55d 50m 20.4s, R=0.05) errorbox 73 sec after notice time and 295 sec after trigger time at 2020-10-21 20:32:14 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 26 deg. The sun altitude is -39.5 deg. The galactic latitude b = -62 deg., longitude l = 303 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1466597 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 325 | MASTER-SAAO | P/ | 60 | 17.7 | 325 | MASTER-SAAO | P\ | 60 | 17.8 | The observation and reduction will continue. The message may be cited.