{
  "circularId": 42203,
  "createdOn": 1760224280171,
  "eventId": "GRB 251011B",
  "subject": "GRB 251011B : MASTER optical observations",
  "bibcode": "2025GCN.42203....1B",
  "body": "P.Balanutsa, V.Lipunov, A.Kuznetsov, G.Antipov, I.Panchenko, K.Zhirkov, N.Tiurina, A.Sankovich, Ya.Kechin, M.Shilova, A.Chasovnikov, V.Topolev,\nV.Senik, D.Vlasenko, Yu.Tselik, E.Gorbovskoy(Lomonosov MSU),\nR.Podesta, C.Francile,  F. Podesta, E. Gonzalez (OAFA, San Juan Uni.,Argentina);\nD.Buckley, (SAAO, South Africa)\nO.Gress, N.Budnev (ISU, Irkutsk),\nA. Sosnovskiy (CrAO RAS),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),\nV.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias, Spain),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez,J.Martinez,A.R.Corella,\nL.H.Rodriguez (INAOE, Guillermo Haro  Astrophysic Observatory, Mexico)\n\nThe MASTER-OAFA robotic telescope of the MASTER Global Robotic Net [1,2,3,4]\nstarted GRB 251011B (Fermi GCN 42196, Swift: D'Ai et al. GCN 42197, XRT Evans et al. GCN 42201,\nTtrigger=2025-10-11 07:08:22UT    XRT RA,Dec(2000)=00h 52m 56.33s,-62d 02' 00.2\")\nat 2025-10-11 07:09:27 with 10s expositions at 48 deg.altitude\nThere is no optical counterpart on a single images\nObservations and reduction will be continued.\n\nTstart(+exp), UT        RADec(2000) of MASTERsquarecent. Exp,s mlim\n2025-10-11 07:09:07\t00h 53m 53.80s -61d 58m 00.8s \t10\t18.0\n2025-10-11 07:09:23\t00h 53m 53.92s -61d 58m 00.0s \t10\t18.0\n2025-10-11 07:09:39\t00h 53m 53.86s -61d 58m 00.6s \t20\t18.6\n2025-10-11 07:10:05\t00h 53m 53.91s -61d 58m 00.5s \t20\t18.9\n2025-10-11 07:10:31\t00h 53m 54.05s -61d 57m 59.3s \t30\t18.0\n2025-10-11 07:11:06\t00h 53m 54.18s -61d 57m 59.2s \t30\t18.0\n2025-10-11 07:11:43\t00h 53m 54.30s -61d 57m 59.1s \t40\t18.3\n2025-10-11 07:12:29\t00h 53m 54.50s -61d 57m 58.5s \t50\t18.8\n2025-10-11 07:13:25\t00h 53m 54.74s -61d 57m 58.3s \t60\t19.2\n2025-10-11 07:14:32\t00h 53m 55.02s -61d 57m 57.6s \t70\t19.6\n2025-10-11 07:15:47\t00h 53m 55.39s -61d 57m 57.1s \t90\t19.6\n2025-10-11 07:17:23\t00h 53m 55.79s -61d 57m 56.7s \t110\t19.6\n2025-10-11 07:19:19\t00h 53m 56.33s -61d 57m 55.8s \t130\t19.6\n2025-10-11 07:21:35\t00h 53m 57.00s -61d 57m 55.1s \t160\t19.6\nup to 2025-10-11 09:17:08.\n\n\n\n[1] Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L\n[2] Lipunov et al. 2022, Universe, Vol. 8(5), id.271\n[3] Lipunov et a. 2019, ARep, vol.63, 293\n[4] Lipunov V., Kornilov V., Gorbovskoy E., Tiurina N., Kuznetsov A.\n 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics,\nLomonosov MSU PRESS, 591pp.\nhttp://www.pereplet.ru/lipunov/625.html#625\n",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "submittedHow": "email"
}