{
  "subject": "Fermi GRB 260208A: Global MASTER-Net observations report",
  "submittedHow": "email",
  "bibcode": "2026GCN.43637....1L",
  "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-OAFA robotic telescope  [1]  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260208A ( Fermi GBM team, GCN 43635) errorbox  829 sec after notice time and 866 sec after trigger time at 2026-02-08 05:21:55 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 82 deg. The sun  altitude  is -43.2 deg. \n\nThe galactic latitude b = 78 deg., longitude l = 64 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=3125988\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n     952 | 2026-02-08 05:21:55 |         MASTER-OAFA | (13h 38m 21.97s , +33d 02m 05.7s) |   C |   170 | 15.2 |        \n    1073 | 2026-02-08 05:24:51 |         MASTER-OAFA | (13h 38m 22.08s , +33d 02m 10.6s) |   C |    60 | 15.9 |        \n    1133 | 2026-02-08 05:24:51 |         MASTER-OAFA | (13h 38m 22.14s , +33d 02m 11.3s) |   C |   180 | 16.9 |  Coadd \n    1139 | 2026-02-08 05:25:57 |         MASTER-OAFA | (13h 38m 22.25s , +33d 02m 15.0s) |   C |    60 | 16.1 |        \n    1205 | 2026-02-08 05:27:02 |         MASTER-OAFA | (13h 38m 22.38s , +33d 02m 19.9s) |   C |    60 | 16.5 |        \n    1271 | 2026-02-08 05:28:08 |         MASTER-OAFA | (13h 38m 22.48s , +33d 02m 24.1s) |   C |    60 | 16.6 |        \n    1331 | 2026-02-08 05:28:08 |         MASTER-OAFA | (13h 38m 22.48s , +33d 02m 24.0s) |   C |   180 | 17.2 |  Coadd \n    1336 | 2026-02-08 05:29:14 |         MASTER-OAFA | (13h 38m 22.62s , +33d 02m 28.3s) |   C |    60 | 16.7 |        \n    1401 | 2026-02-08 05:30:19 |         MASTER-OAFA | (13h 38m 22.73s , +33d 02m 32.6s) |   C |    60 | 16.8 |        \n    1467 | 2026-02-08 05:31:25 |         MASTER-OAFA | (13h 38m 22.83s , +33d 02m 36.7s) |   C |    60 | 17.0 |        \n    1527 | 2026-02-08 05:31:25 |         MASTER-OAFA | (13h 38m 22.83s , +33d 02m 36.7s) |   C |   180 | 17.7 |  Coadd \n    1532 | 2026-02-08 05:32:30 |         MASTER-OAFA | (13h 38m 22.91s , +33d 02m 40.5s) |   C |    60 | 17.1 |        \n    1598 | 2026-02-08 05:33:36 |         MASTER-OAFA | (13h 38m 22.99s , +33d 02m 44.5s) |   C |    60 | 17.2 |        \n    1664 | 2026-02-08 05:34:42 |         MASTER-OAFA | (13h 38m 23.00s , +33d 02m 48.1s) |   C |    60 | 17.2 |        \n    1724 | 2026-02-08 05:34:42 |         MASTER-OAFA | (13h 38m 23.01s , +33d 02m 48.1s) |   C |   180 | 17.9 |  Coadd \n    1730 | 2026-02-08 05:35:48 |         MASTER-OAFA | (13h 38m 23.04s , +33d 02m 51.5s) |   C |    60 | 17.2 |        \n    1796 | 2026-02-08 05:36:53 |         MASTER-OAFA | (13h 38m 23.05s , +33d 02m 54.5s) |   C |    60 | 17.3 |        \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": 43637,
  "createdOn": 1770533132978,
  "eventId": "GRB 260208A",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>"
}