//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31812 SUBJECT: GRB 220401B: Fermi GBM Final Real-time Localization DATE: 22/04/01 21:40:11 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 21:29:49 UT on 1 Apr 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220401B (trigger 670541394.48622 / 220401896). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 352.5, Dec = 42.9 (J2000 degrees, equivalent to J2000 23h 30m, 42d 53'), with a statistical uncertainty of 5.0 degrees. The angle from the Fermi LAT boresight is 35.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220401896/quicklook/glg_skymap_all_bn220401896.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220401896/quicklook/glg_healpix_all_bn220401896.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220401896/quicklook/glg_lc_medres34_bn220401896.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31813 SUBJECT: Fermi GRB 220401B: Global MASTER-Net observations report DATE: 22/04/02 00:30:34 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 220401B ( Fermi GBM team, GCN 31812) errorbox 6433 sec after notice time and 6465 sec after trigger time at 2022-04-01 23:17:35 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 79 deg. The sun altitude is -37.2 deg. The galactic latitude b = -17 deg., longitude l = 108 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1929659 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6496 | 2022-04-01 23:17:35 | MASTER-Tavrida | (23h 11m 07.09s , +48d 44m 33.2s) | C | 60 | 15.8 | 6575 | 2022-04-01 23:18:54 | MASTER-Tavrida | (23h 23m 11.16s , +48d 42m 51.3s) | C | 60 | 15.2 | 7361 | 2022-04-01 23:32:00 | MASTER-Tavrida | (23h 05m 26.06s , +46d 50m 36.7s) | C | 60 | 16.1 | 7441 | 2022-04-01 23:33:20 | MASTER-Tavrida | (23h 17m 04.52s , +46d 49m 09.2s) | C | 60 | 15.9 | 7521 | 2022-04-01 23:34:40 | MASTER-Tavrida | (23h 11m 12.74s , +48d 44m 00.8s) | C | 60 | 16.5 | 7600 | 2022-04-01 23:35:59 | MASTER-Tavrida | (23h 20m 04.91s , +48d 43m 37.2s) | C | 60 | 15.6 | 7680 | 2022-04-01 23:37:19 | MASTER-Tavrida | (23h 31m 02.95s , +48d 43m 40.8s) | C | 60 | 15.5 | 8158 | 2022-04-01 23:45:17 | MASTER-Tavrida | (23h 09m 43.90s , +44d 57m 08.3s) | C | 60 | 16.0 | 8476 | 2022-04-01 23:50:35 | MASTER-Tavrida | (23h 02m 23.18s , +46d 50m 15.2s) | C | 60 | 16.8 | 8556 | 2022-04-01 23:51:55 | MASTER-Tavrida | (23h 14m 02.06s , +46d 49m 02.9s) | C | 60 | 16.6 | 8635 | 2022-04-01 23:53:14 | MASTER-Tavrida | (23h 08m 08.92s , +48d 43m 56.8s) | C | 60 | 16.9 | 8714 | 2022-04-01 23:54:33 | MASTER-Tavrida | (23h 20m 07.49s , +48d 43m 25.0s) | C | 60 | 16.3 | 8794 | 2022-04-01 23:55:53 | MASTER-Tavrida | (23h 31m 01.03s , +48d 44m 27.0s) | C | 60 | 16.1 | 8873 | 2022-04-01 23:57:12 | MASTER-Tavrida | (23h 43m 10.22s , +48d 43m 30.6s) | C | 60 | 15.4 | 9032 | 2022-04-01 23:59:51 | MASTER-Tavrida | (22h 58m 35.49s , +44d 55m 08.8s) | C | 60 | 16.4 | 9111 | 2022-04-02 00:01:10 | MASTER-Tavrida | (23h 09m 48.29s , +44d 56m 28.6s) | C | 60 | 16.4 | 9271 | 2022-04-02 00:03:50 | MASTER-Tavrida | (23h 19m 52.95s , +44d 55m 51.3s) | C | 60 | 16.4 | 9350 | 2022-04-02 00:05:09 | MASTER-Tavrida | (23h 31m 07.29s , +44d 56m 57.7s) | C | 60 | 16.0 | 9429 | 2022-04-02 00:06:28 | MASTER-Tavrida | (23h 02m 26.20s , +46d 49m 30.5s) | C | 60 | 16.9 | 9509 | 2022-04-02 00:07:48 | MASTER-Tavrida | (23h 13m 59.57s , +46d 48m 31.5s) | C | 60 | 16.9 | 9752 | 2022-04-02 00:11:51 | MASTER-Tavrida | (23h 07m 17.41s , +43d 02m 48.0s) | C | 60 | 16.6 | 9832 | 2022-04-02 00:13:11 | MASTER-Tavrida | (23h 31m 08.40s , +48d 43m 17.3s) | C | 60 | 16.7 | 9912 | 2022-04-02 00:14:31 | MASTER-Tavrida | (23h 43m 05.75s , +48d 42m 20.0s) | C | 60 | 16.4 | 9991 | 2022-04-02 00:15:50 | MASTER-Tavrida | (22h 58m 35.99s , +44d 54m 54.0s) | C | 60 | 17.1 | 10070 | 2022-04-02 00:17:09 | MASTER-Tavrida | (23h 09m 49.83s , +44d 56m 20.4s) | C | 60 | 17.1 | 10150 | 2022-04-02 00:18:29 | MASTER-Tavrida | (23h 17m 11.74s , +43d 02m 16.9s) | C | 60 | 16.7 | 10229 | 2022-04-02 00:19:48 | MASTER-Tavrida | (23h 28m 01.20s , +43d 01m 49.4s) | C | 60 | 16.1 | 10309 | 2022-04-02 00:21:08 | MASTER-Tavrida | (23h 19m 55.45s , +44d 56m 35.0s) | C | 60 | 17.1 | 10388 | 2022-04-02 00:22:27 | MASTER-Tavrida | (23h 31m 17.24s , +44d 55m 39.2s) | C | 60 | 16.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.