{
  "circularId": 43095,
  "subject": "GRB 251214B : MASTER optical afterglow detection",
  "bibcode": "2025GCN.43095....1G",
  "body": "O.A.Gress, N.M.Budnev (ISU),\nV.M.Lipunov, P.Balanutsa, I.Panchenko, A.Kuznetsov, E.Gorbovskoy, G.Antipov,\nN. Tiurina, Ya.Kechin,A.Chasovnikov, D.Vlasenko, V.Shumkov, I.Ionov, Yu.Tselik(Lomonosov MSU, SAI, Moscow),\nR.Mirgazov, A.Diachok, O.Ershova (Irkutsk State University),\nR. Podesta, C.Francile,  F. Podesta, E. Gonzalez (OAFA, San JuanUni.,Argentina);\nD.Buckley (SAAO),\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,\nL.H.Rodriguez (INAOE, Guillermo Haro Astrophysic Observatory, Mexico)\nV.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias,Spain)\n\n\nMASTER OT J220050.55-090945.8 detection\n\nMASTER-Tunka  robotic telescope of MASTER Global Robotic Net (Lipunov et al. [1-4], http://observ.pereplet.ru ),\nstarted Fermi (GCN 43088) and Swift (GCN 43089) GRB 251214B error-box observations\nafter sunset at 2025-12-14 10:20:46 UT (Lipunov et al. GCN 43091, cover map https://master.sai.msu.ru/site/master2/event.php?id=3070779 )\n\nMASTER auto-detection system found optical afterglow at summary images\nMASTER OT J220050.55-090945.8 , discovered by Swift (Eyles-Ferris et al. GCN 430089) and also observed by SVOM (Zhe Kang et al. GCN 43093)\n with unfiltered m_OT=19.5m at 2025-12-14 10:49:16UT.\n\nThere is SDSS galaxy (poss.host) in 0.067\" in VIZIER database with z_phot=0.6634\n\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",
  "eventId": "GRB 251214B",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "createdOn": 1765716936728,
  "submittedHow": "email"
}