TITLE: GCN CIRCULAR NUMBER: 42203 SUBJECT: GRB 251011B : MASTER optical observations DATE: 25/10/11 23:11:20 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
P.Balanutsa, V.Lipunov, A.Kuznetsov, G.Antipov, I.Panchenko, K.Zhirkov, N.Tiurina, A.Sankovich, Ya.Kechin, M.Shilova, A.Chasovnikov, V.Topolev, V.Senik, D.Vlasenko, Yu.Tselik, E.Gorbovskoy(Lomonosov MSU), R.Podesta, C.Francile, F. Podesta, E. Gonzalez (OAFA, San Juan Uni.,Argentina); D.Buckley, (SAAO, South Africa) O.Gress, N.Budnev (ISU, Irkutsk), A. Sosnovskiy (CrAO RAS), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), V.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias, Spain), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez,J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysic Observatory, Mexico)
The MASTER-OAFA robotic telescope of the MASTER Global Robotic Net [1,2,3,4] started GRB 251011B (Fermi GCN 42196, Swift: D'Ai et al. GCN 42197, XRT Evans et al. GCN 42201, Ttrigger=2025-10-11 07:08:22UT XRT RA,Dec(2000)=00h 52m 56.33s,-62d 02' 00.2") at 2025-10-11 07:09:27 with 10s expositions at 48 deg.altitude There is no optical counterpart on a single images Observations and reduction will be continued.
Tstart(+exp), UT RADec(2000) of MASTERsquarecent. Exp,s mlim 2025-10-11 07:09:07 00h 53m 53.80s -61d 58m 00.8s 10 18.0 2025-10-11 07:09:23 00h 53m 53.92s -61d 58m 00.0s 10 18.0 2025-10-11 07:09:39 00h 53m 53.86s -61d 58m 00.6s 20 18.6 2025-10-11 07:10:05 00h 53m 53.91s -61d 58m 00.5s 20 18.9 2025-10-11 07:10:31 00h 53m 54.05s -61d 57m 59.3s 30 18.0 2025-10-11 07:11:06 00h 53m 54.18s -61d 57m 59.2s 30 18.0 2025-10-11 07:11:43 00h 53m 54.30s -61d 57m 59.1s 40 18.3 2025-10-11 07:12:29 00h 53m 54.50s -61d 57m 58.5s 50 18.8 2025-10-11 07:13:25 00h 53m 54.74s -61d 57m 58.3s 60 19.2 2025-10-11 07:14:32 00h 53m 55.02s -61d 57m 57.6s 70 19.6 2025-10-11 07:15:47 00h 53m 55.39s -61d 57m 57.1s 90 19.6 2025-10-11 07:17:23 00h 53m 55.79s -61d 57m 56.7s 110 19.6 2025-10-11 07:19:19 00h 53m 56.33s -61d 57m 55.8s 130 19.6 2025-10-11 07:21:35 00h 53m 57.00s -61d 57m 55.1s 160 19.6 up to 2025-10-11 09:17:08.
[1] Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L [2] Lipunov et al. 2022, Universe, Vol. 8(5), id.271 [3] Lipunov et a. 2019, ARep, vol.63, 293 [4] Lipunov V., Kornilov V., Gorbovskoy E., Tiurina N., Kuznetsov A. 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http://www.pereplet.ru/lipunov/625.html#625
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