TITLE: GCN CIRCULAR NUMBER: 42821 SUBJECT: Fermi GRB 251124a: Global MASTER-Net observations report DATE: 25/11/24 15:30:22 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 251124a ( Fermi GBM team, GCN 42820) errorbox 5857 sec after notice time and 5878 sec after trigger time at 2025-11-24 14:36:01 UT, with upper limit up to 13.0 mag. Observations started at twilight. The observations began at zenith distance = 62 deg. The sun altitude is -10.2 deg. The galactic latitude b = 29 deg., longitude l = 38 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3050796 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 5938 | 2025-11-24 14:36:01 | MASTER-Kislovodsk | (17h 11m 31.23s , +16d 54m 33.8s) | P- | 120 | 12.6 | 6078 | 2025-11-24 14:38:21 | MASTER-Kislovodsk | (17h 11m 31.15s , +16d 54m 22.6s) | P- | 120 | 12.5 | 6218 | 2025-11-24 14:40:41 | MASTER-Kislovodsk | (17h 11m 32.20s , +17d 16m 49.8s) | P| | 120 | 12.2 | 6218 | 2025-11-24 14:40:41 | MASTER-Kislovodsk | (17h 11m 31.11s , +16d 54m 13.1s) | P- | 120 | 13.0 | The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/42821. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...