TITLE: GCN CIRCULAR NUMBER: 35950 SUBJECT: Fermi GRB 240318A: Global MASTER-Net observations report DATE: 24/03/18 03:30:37 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (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. Gress, N.M. Budnev, O.Ershova (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), V. Yurkov, A. Gabovich (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 240318A ( Fermi GBM team, GCN 35949) errorbox 45 sec after notice time and 77 sec after trigger time at 2024-03-18 02:52:19 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 55 deg. The sun altitude is -11.1 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240318A errorbox 52 sec after notice time and 84 sec after trigger time at 2024-03-18 02:52:25 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 47 deg. The sun altitude is -23.4 deg. The galactic latitude b = 4 deg., longitude l = 25 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2401036 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 88 | 2024-03-18 02:52:19 | MASTER-Tavrida | (18h 47m 01.74s , -04d 52m 07.6s) | C | 20 | 16.5 | 94 | 2024-03-18 02:52:25 | MASTER-SAAO | (18h 42m 40.28s , -05d 38m 11.7s) | C | 20 | 17.5 | 94 | 2024-03-18 02:52:25 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 58.7s) | C | 20 | 17.4 | 117 | 2024-03-18 02:52:48 | MASTER-Tavrida | (18h 47m 05.23s , -04d 51m 08.3s) | C | 20 | 16.5 | 134 | 2024-03-18 02:53:05 | MASTER-SAAO | (18h 42m 40.33s , -05d 38m 08.3s) | C | 20 | 17.5 | 134 | 2024-03-18 02:53:05 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 54.8s) | C | 20 | 17.4 | 149 | 2024-03-18 02:53:16 | MASTER-Tavrida | (18h 46m 58.27s , -04d 51m 41.1s) | C | 30 | 16.6 | 178 | 2024-03-18 02:53:44 | MASTER-SAAO | (18h 42m 40.38s , -05d 38m 05.3s) | C | 30 | 17.6 | 178 | 2024-03-18 02:53:44 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 51.9s) | C | 30 | 17.6 | 187 | 2024-03-18 02:53:53 | MASTER-Tavrida | (18h 46m 58.14s , -04d 50m 44.1s) | C | 30 | 16.6 | 228 | 2024-03-18 02:54:29 | MASTER-Tavrida | (18h 47m 04.89s , -04d 51m 46.9s) | C | 40 | 16.6 | 232 | 2024-03-18 02:54:34 | MASTER-SAAO | (18h 42m 40.45s , -05d 38m 02.3s) | C | 40 | 17.6 | 232 | 2024-03-18 02:54:34 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 48.9s) | C | 40 | 17.6 | 282 | 2024-03-18 02:55:18 | MASTER-Tavrida | (18h 46m 57.52s , -04d 52m 50.5s) | C | 50 | 16.5 | 345 | 2024-03-18 02:56:16 | MASTER-Tavrida | (18h 47m 03.45s , -04d 52m 44.2s) | C | 60 | 16.5 | 648 | 2024-03-18 03:00:49 | MASTER-Tavrida | (18h 22m 27.68s , -04d 26m 36.6s) | C | 120 | 16.4 | 787 | 2024-03-18 03:02:59 | MASTER-Tavrida | (18h 22m 25.32s , -04d 25m 45.6s) | C | 140 | 16.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35950. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...