{
  "bibcode": "2025GCN.42930....1B",
  "format": "text/plain",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "version": 2,
  "circularId": 42930,
  "body": "\nD.Buckley (SAAO), V.M. Lipunov (Lomonosov MSU), A.Kuznetsov, I.Panchenko, G.Antipov, P.Balanutsa, K.Zhirkov, V.Senik, N. Tiurina, Ya.Kechin, A.Chasovnikov, D.Vlasenko, E.Gorbovskoy, Yu.Tselik(Lomonosov MSU, SAI, Moscow),\nO.A.Gress, N.M.Budnev, O.Ershova (Irkutsk State University),\nR. Podesta, C.Francile,  F. Podesta, E. Gonzalez (OAFA, San Juan Uni.,Argentina);\nA. Sosnovskij (CrAO RAS),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysic Observatory, Mexico)\nV.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias,Spain),\n\nMASTER-SAAO robotic telescope of MASTER Global Robotic Net (Lipunov et al. [1-4], http://observ.pereplet.ru ),\nstarted Fermi/ Swift GRB 251201B (Fermi GCN 42923, Moss et al GCN 42924, Osborne et al. GCN 42927) inspect at 2025-12-01 22:00:57 UT (20067s after trigger time), Lipunov et al. GCN 42928\n\nThere is optical counterpart MASTER OT J002534.28-441352.2\nat Swift UVOT position (Moss et al. GCN 42924)\n with unfiltered m_OT~20.4m at summary image at  22:00:57 UT (420s exposition, mlim=21m).\n\nReal time updated cover map and OT  position are available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id=3057197\nObservation and reduction will continue.\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. 2023,\nAstronomical Robotic Networks and Operative Multichanel Astrophysics,Lomonosov MSU PRESS, 591pp.\nhttp://www.pereplet.ru/lipunov/625.html#625",
  "submittedHow": "email",
  "editedOn": 1764957629286,
  "eventId": "GRB 251201B",
  "createdOn": 1764631096594,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@sai.msu.ru>",
  "subject": "Swift GRB 251201B : MASTER optical counterpart detection"
}