{
  "eventId": "GRB 260111A",
  "body": "V.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, I. Gorbunov (Lomonosov MSU),\nO.Gress, N.Budnev (ISU),\nC.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),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),\nD.Buckley (SAAO),\nR.Rebolo (The Instituto de Astrofisica de Canarias),\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\nMASTER-Tunka robotic telescope  [1]  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 260111A ( Fermi GBM team, GCN 43370) errorbox  201 sec after notice time and 236 sec after trigger time at 2026-01-11 16:37:10 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 70 deg. The sun  altitude  is -59.9 deg. \n\nThe galactic latitude b = 56 deg., longitude l = 85 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=3100149\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n     262 | 2026-01-11 16:37:10 |        MASTER-Tunka | (14h 52m 29.86s , +46d 07m 42.6s) |   C |    50 | 17.8 |        \n     262 | 2026-01-11 16:37:10 |        MASTER-Tunka | (14h 52m 01.47s , +46d 14m 15.0s) |   C |    50 | 18.3 |        \n     320 | 2026-01-11 16:38:04 |        MASTER-Tunka | (14h 52m 01.36s , +46d 14m 14.7s) |   C |    60 | 18.5 |        \n     320 | 2026-01-11 16:38:04 |        MASTER-Tunka | (14h 52m 29.78s , +46d 07m 43.0s) |   C |    60 | 18.1 |        \n     384 | 2026-01-11 16:39:07 |        MASTER-Tunka | (14h 52m 01.23s , +46d 14m 15.1s) |   C |    60 | 18.3 |        \n     384 | 2026-01-11 16:39:07 |        MASTER-Tunka | (14h 52m 29.72s , +46d 07m 43.8s) |   C |    60 | 18.0 |        \n     607 | 2026-01-11 16:42:51 |        MASTER-Tunka | (14h 58m 24.98s , +50d 10m 13.5s) |   C |    60 | 18.8 |        \n     667 | 2026-01-11 16:42:51 |        MASTER-Tunka | (14h 58m 24.98s , +50d 10m 13.5s) |   C |   180 | 19.5 |  Coadd \n     607 | 2026-01-11 16:42:51 |        MASTER-Tunka | (14h 58m 56.47s , +50d 03m 31.9s) |   C |    60 | 18.4 |        \n     670 | 2026-01-11 16:43:54 |        MASTER-Tunka | (14h 58m 56.32s , +50d 03m 33.3s) |   C |    60 | 18.4 |        \n     670 | 2026-01-11 16:43:54 |        MASTER-Tunka | (14h 58m 24.82s , +50d 10m 13.4s) |   C |    60 | 18.7 |        \n     734 | 2026-01-11 16:44:58 |        MASTER-Tunka | (14h 58m 24.70s , +50d 10m 13.5s) |   C |    60 | 18.7 |        \n     734 | 2026-01-11 16:44:58 |        MASTER-Tunka | (14h 58m 56.28s , +50d 03m 33.8s) |   C |    60 | 18.3 |        \n     797 | 2026-01-11 16:46:01 |        MASTER-Tunka | (14h 58m 24.72s , +50d 10m 13.7s) |   C |    60 | 18.6 |        \n     797 | 2026-01-11 16:46:01 |        MASTER-Tunka | (14h 58m 56.30s , +50d 03m 33.8s) |   C |    60 | 18.3 |        \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",
  "circularId": 43371,
  "createdOn": 1768151739465,
  "subject": "Fermi GRB 260111A: Global MASTER-Net observations report",
  "bibcode": "2026GCN.43371....1L",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "submittedHow": "email"
}