{
  "createdOn": 1790570778089,
  "subject": "Fermi GRB 260928A: Global MASTER-Net observations report",
  "circularId": 45773,
  "submittedHow": "email",
  "body": "M. Segura,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA)\n\nV.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko,  \nG.Antipov,  A.Sankovich,  Yu.Tselik, Ya..Kechin, V.Senik, A.Chasovnikov, K.Labsina (Lomonosov MSU)\n\nD.Buckley (SAAO),\n\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\nA.Sosnovskij (Lomonosov MSU)\n\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\n\nR.Rebolo (The Instituto de Astrofisica de Canarias)\n\nO.Gress, N.Budnev(ISU)\n\n\nMASTER-OAFA robotic telescope  [1]  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260928A ( Fermi GBM team, GCN 45772) errorbox  6239 sec after notice time and 6279 sec after trigger time at 2026-09-28 02:15:56 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 52 deg. The sun  altitude  is -44.3 deg. \n\nThe galactic latitude b = -4 deg., longitude l = 44 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=3513224\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n    6310 | 2026-09-28 02:15:56 |         MASTER-OAFA | (19h 30m 04.80s , +05d 02m 26.7s) |   C |    60 | 17.0 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n\n[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.\nhttp : // www.pereplet.ru/lipunov/625.html\n",
  "eventId": "GRB 260928A",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>"
}