{
  "eventId": "GRB 260310A",
  "circularId": 43978,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "subject": "GRB 260310A / AT2026fgk : MASTER OT rebrightening during 7h observations",
  "createdOn": 1773368302215,
  "submittedHow": "email",
  "body": "V.Lipunov (Lomonosov MSU), N.Budnev, O.Gress (ISU),\nA.Kuznetsov, I.Panchenko, P.Balanutsa, G.Antipov, E.Gorbovskoy, N.Tiurina, Ya.Kechin, V.Senik, A.Chasovnikov, M.Shilova,V.Topolev, D.Vlasenko, A.Sankovich, Yu.Tselik (Lomonosov MSU),\nD.Svinkin (Ioffe Institute),\nM.J. Segura, C.Francile,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA.Sosnovskij (CrAO),\nD.Buckley (SAAO),\nR.Rebolo (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.R.Corella, J.Tanori, L. Villalobos, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\n\nMASTER Global Robotic Net [1-4] started Fermi GRB 260310A observations (Fermi team GCN 43951)\nat MASTER-Tunka  robotic telescope at 2026-03-10 16:01:36 UT (Lipunov et al. GCN 43954)\n\nOptical transient AT2026fgk, discovered by GOTO at 2026-03-10 05:14:30.624 (TNSC 1001, https://www.wis-tns.org/object/2026fgk )\nwas detected as MASTER OT J143716.19+715031.2 at our images at 2026-03-12 13:46:11UT with m_unfiltered~18.3.\nThis OT was observed at 400 images with rebrigtening detection to 17.2 at 2026-03-12 21:02:59 UT.\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 et al. 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics,Lomonosov MSU PRESS, 591pp.\nhttp://www.pereplet.ru/lipunov/625.html#625"
}