TITLE: GCN CIRCULAR NUMBER: 37641 SUBJECT: Fermi GRB 240930B: Global MASTER-Net observations report DATE: 24/09/30 18:45:58 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-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 GRB 240930B ( Fermi GBM team, GCN 37640) errorbox 118 sec after notice time and 151 sec after trigger time at 2024-09-30 17:20:33 UT, with upper limit up to 15.9 mag. Observations started at twilight. The observations began at zenith distance = 75 deg. The sun altitude is -9.4 deg. The galactic latitude b = -3 deg., longitude l = 83 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2620328 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 166 | 2024-09-30 17:20:33 | MASTER-SAAO | (20h 49m 45.26s , +39d 39m 45.0s) | C | 30 | 14.2 | 211 | 2024-09-30 17:20:33 | MASTER-SAAO | (20h 49m 45.27s , +39d 39m 45.1s) | C | 120 | 15.2 | Coadd 220 | 2024-09-30 17:21:22 | MASTER-SAAO | (20h 49m 45.45s , +39d 39m 47.8s) | C | 40 | 13.9 | 284 | 2024-09-30 17:22:21 | MASTER-SAAO | (20h 49m 45.71s , +39d 39m 51.7s) | C | 50 | 15.1 | 358 | 2024-09-30 17:23:30 | MASTER-SAAO | (20h 49m 45.95s , +39d 39m 55.2s) | C | 60 | 15.4 | 604 | 2024-09-30 17:27:36 | MASTER-SAAO | (20h 54m 11.43s , +40d 26m 14.9s) | C | 60 | 14.0 | 664 | 2024-09-30 17:27:36 | MASTER-SAAO | (20h 54m 11.43s , +40d 26m 14.9s) | C | 180 | 15.3 | Coadd 684 | 2024-09-30 17:28:55 | MASTER-SAAO | (20h 54m 11.69s , +40d 26m 17.7s) | C | 60 | 14.6 | 763 | 2024-09-30 17:30:14 | MASTER-SAAO | (20h 54m 11.95s , +40d 26m 20.0s) | C | 60 | 14.7 | 842 | 2024-09-30 17:31:33 | MASTER-SAAO | (20h 54m 12.22s , +40d 26m 22.3s) | C | 60 | 15.3 | 1181 | 2024-09-30 17:37:12 | MASTER-SAAO | (20h 44m 39.54s , +40d 45m 14.1s) | C | 60 | 15.8 | 1260 | 2024-09-30 17:38:32 | MASTER-SAAO | (20h 55m 17.13s , +40d 46m 14.7s) | C | 60 | 15.9 | 1578 | 2024-09-30 17:43:50 | MASTER-SAAO | (20h 49m 30.74s , +38d 51m 18.7s) | C | 60 | 15.3 | 1658 | 2024-09-30 17:45:09 | MASTER-SAAO | (20h 59m 44.68s , +38d 52m 04.7s) | C | 60 | 15.1 | 1737 | 2024-09-30 17:46:29 | MASTER-SAAO | (20h 41m 17.74s , +42d 41m 20.3s) | C | 60 | 14.8 | 1816 | 2024-09-30 17:47:48 | MASTER-SAAO | (20h 51m 56.45s , +42d 39m 51.8s) | C | 60 | 15.2 | 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/37641. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...