TITLE: GCN CIRCULAR NUMBER: 42873 SUBJECT: Fermi GRB 251128A: Global MASTER-Net observations report DATE: 25/11/28 15:15:24 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 251128A ( Fermi GBM team, GCN 42865) errorbox 36273 sec after notice time and 36305 sec after trigger time at 2025-11-28 14:27:27 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 80 deg. The sun altitude is -9.0 deg. The galactic latitude b = 30 deg., longitude l = 166 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3053740 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 36336 | 2025-11-28 14:27:27 | MASTER-Kislovodsk | (07h 48m 24.78s , +54d 16m 19.6s) | C | 60 | 12.8 | 36336 | 2025-11-28 14:27:27 | MASTER-Kislovodsk | (07h 55m 11.13s , +53d 52m 14.4s) | C | 60 | 15.7 | 36496 | 2025-11-28 14:30:07 | MASTER-Kislovodsk | (07h 27m 49.20s , +52d 20m 52.7s) | C | 60 | 13.1 | 36496 | 2025-11-28 14:30:07 | MASTER-Kislovodsk | (07h 34m 27.48s , +51d 56m 56.6s) | C | 60 | 16.0 | 36575 | 2025-11-28 14:31:27 | MASTER-Kislovodsk | (07h 44m 12.06s , +56d 08m 56.4s) | C | 60 | 13.4 | 36575 | 2025-11-28 14:31:27 | MASTER-Kislovodsk | (07h 51m 27.99s , +55d 44m 39.4s) | C | 60 | 16.3 | 36655 | 2025-11-28 14:32:46 | MASTER-Kislovodsk | (07h 29m 20.17s , +53d 53m 04.8s) | C | 60 | 16.6 | 37136 | 2025-11-28 14:40:47 | MASTER-Kislovodsk | (07h 59m 24.43s , +51d 57m 45.1s) | C | 60 | 16.3 | 37136 | 2025-11-28 14:40:47 | MASTER-Kislovodsk | (07h 52m 49.54s , +52d 22m 11.6s) | C | 60 | 13.5 | 37608 | 2025-11-28 14:48:39 | MASTER-Kislovodsk | (07h 39m 46.04s , +50d 04m 30.2s) | C | 60 | 16.5 | 37608 | 2025-11-28 14:48:39 | MASTER-Kislovodsk | (07h 33m 24.33s , +50d 28m 49.0s) | C | 60 | 14.3 | Filter C is a clear (unfiltred) band. 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/42873. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...