TITLE: GCN CIRCULAR NUMBER: 31676 SUBJECT: Fermi GRB 220304A: Global MASTER-Net observations report DATE: 22/03/04 08:30:14 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, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API), B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (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 220304A ( Fermi GBM team, GCN 31672) errorbox 141 sec after notice time and 148 sec after trigger time at 2022-03-04 05:31:27 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 65 deg. The sun altitude is -25.8 deg. The galactic latitude b = 10 deg., longitude l = 344 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1901611 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 164 | 2022-03-04 05:31:27 | MASTER-IAC | (16h 31m 09.59s , -34d 58m 25.0s) | P| | 30 | 16.7 | 164 | 2022-03-04 05:31:27 | MASTER-IAC | (16h 32m 18.05s , -35d 06m 08.0s) | P- | 30 | 16.1 | 287 | 2022-03-04 05:33:20 | MASTER-IAC | (16h 31m 06.66s , -34d 57m 41.0s) | P| | 50 | 17.0 | 287 | 2022-03-04 05:33:20 | MASTER-IAC | (16h 32m 15.15s , -35d 05m 23.2s) | P- | 50 | 16.7 | 367 | 2022-03-04 05:34:30 | MASTER-IAC | (16h 31m 07.06s , -34d 56m 42.3s) | P| | 70 | 17.1 | 367 | 2022-03-04 05:34:30 | MASTER-IAC | (16h 32m 15.46s , -35d 04m 24.5s) | P- | 70 | 16.9 | 462 | 2022-03-04 05:36:00 | MASTER-IAC | (16h 31m 12.49s , -34d 57m 44.8s) | P| | 80 | 17.2 | 462 | 2022-03-04 05:36:00 | MASTER-IAC | (16h 32m 20.78s , -35d 05m 26.9s) | P- | 80 | 16.9 | 571 | 2022-03-04 05:37:40 | MASTER-IAC | (16h 31m 06.38s , -34d 58m 46.1s) | P| | 100 | 17.3 | 571 | 2022-03-04 05:37:40 | MASTER-IAC | (16h 32m 14.60s , -35d 06m 28.1s) | P- | 100 | 17.0 | 706 | 2022-03-04 05:39:40 | MASTER-IAC | (16h 17m 26.64s , -35d 37m 37.7s) | P| | 130 | 17.6 | 706 | 2022-03-04 05:39:40 | MASTER-IAC | (16h 18m 35.17s , -35d 45m 20.1s) | P- | 130 | 17.4 | 872 | 2022-03-04 05:42:10 | MASTER-IAC | (16h 17m 23.11s , -35d 36m 33.5s) | P| | 160 | 17.6 | 872 | 2022-03-04 05:42:10 | MASTER-IAC | (16h 18m 31.47s , -35d 44m 16.5s) | P- | 160 | 17.5 | 2103 | 2022-03-04 06:03:31 | MASTER-IAC | (16h 15m 06.77s , -34d 47m 40.2s) | C | 60 | 17.5 | 2103 | 2022-03-04 06:03:31 | MASTER-IAC | (16h 25m 04.10s , -34d 54m 02.7s) | C | 60 | 17.3 | 2183 | 2022-03-04 06:04:51 | MASTER-IAC | (16h 30m 06.12s , -36d 49m 14.5s) | C | 60 | 17.3 | 2183 | 2022-03-04 06:04:51 | MASTER-IAC | (16h 19m 54.38s , -36d 42m 50.0s) | C | 60 | 17.7 | 2263 | 2022-03-04 06:06:11 | MASTER-IAC | (16h 21m 25.45s , -33d 02m 05.6s) | C | 60 | 17.4 | 2422 | 2022-03-04 06:08:51 | MASTER-IAC | (16h 06m 35.72s , -34d 53m 49.9s) | C | 60 | 17.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.