TITLE: GCN CIRCULAR NUMBER: 32015 SUBJECT: Fermi trigger No 673846271: Global MASTER-Net observations report DATE: 22/05/10 17:15:35 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-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 GRB220510.15 (trigger No 673846271,07h 17m 24.00s , -11d 51m 36.0s, R=8.75) errorbox 47372 sec after notice time and 47407 sec after trigger time at 2022-05-10 16:41:13 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenith distance = 35 deg. The sun altitude is -10.5 deg. The galactic latitude b = 1 deg., longitude l = 227 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1967847 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 47438 | 2022-05-10 16:41:13 | MASTER-SAAO | (07h 10m 17.25s , -12d 04m 33.5s) | C | 60 | 15.3 | 47522 | 2022-05-10 16:42:38 | MASTER-SAAO | (07h 18m 21.75s , -12d 05m 28.2s) | C | 60 | 15.7 | 47612 | 2022-05-10 16:44:08 | MASTER-SAAO | (07h 07m 24.09s , -10d 09m 31.4s) | C | 60 | 15.5 | 47693 | 2022-05-10 16:45:29 | MASTER-SAAO | (07h 15m 32.85s , -10d 11m 03.8s) | C | 60 | 15.8 | 47784 | 2022-05-10 16:47:00 | MASTER-SAAO | (07h 13m 29.45s , -13d 58m 15.8s) | C | 60 | 16.0 | 47864 | 2022-05-10 16:48:20 | MASTER-SAAO | (07h 21m 45.10s , -13d 57m 13.0s) | C | 60 | 16.3 | 47956 | 2022-05-10 16:49:52 | MASTER-SAAO | (07h 22m 50.12s , -10d 11m 09.8s) | C | 60 | 16.0 | 48046 | 2022-05-10 16:51:21 | MASTER-SAAO | (07h 31m 04.45s , -10d 11m 04.1s) | C | 60 | 16.8 | 48125 | 2022-05-10 16:52:41 | MASTER-SAAO | (07h 25m 46.73s , -12d 04m 56.4s) | C | 60 | 16.9 | 48216 | 2022-05-10 16:54:12 | MASTER-SAAO | (07h 34m 02.34s , -12d 03m 26.3s) | C | 60 | 17.5 | 48296 | 2022-05-10 16:55:32 | MASTER-SAAO | (07h 04m 58.93s , -08d 14m 53.1s) | C | 60 | 16.2 | 48386 | 2022-05-10 16:57:02 | MASTER-SAAO | (07h 13m 12.11s , -08d 15m 50.3s) | C | 60 | 16.8 | 48466 | 2022-05-10 16:58:22 | MASTER-SAAO | (07h 10m 06.20s , -12d 04m 49.4s) | C | 60 | 16.9 | 48558 | 2022-05-10 16:59:53 | MASTER-SAAO | (07h 18m 24.68s , -12d 04m 43.4s) | C | 60 | 16.9 | 48884 | 2022-05-10 17:05:20 | MASTER-SAAO | (07h 07m 19.99s , -10d 10m 29.9s) | C | 60 | 17.1 | 48973 | 2022-05-10 17:06:49 | MASTER-SAAO | (07h 15m 31.70s , -10d 09m 00.8s) | C | 60 | 17.4 | 49053 | 2022-05-10 17:08:09 | MASTER-SAAO | (07h 13m 27.08s , -13d 57m 29.9s) | C | 60 | 17.3 | 49144 | 2022-05-10 17:09:40 | MASTER-SAAO | (07h 21m 41.93s , -13d 56m 27.9s) | C | 60 | 17.5 | 49224 | 2022-05-10 17:11:00 | MASTER-SAAO | (07h 22m 51.48s , -10d 09m 24.5s) | C | 60 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.