{
  "bibcode": "2026GCN.43809....1L",
  "circularId": 43809,
  "createdOn": 1771823725183,
  "eventId": "GRB 260223A",
  "subject": "Fermi GRB 260223A: Global MASTER-Net observations report",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "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 260223A ( Fermi GBM team, GCN 43808) errorbox  123 sec after notice time and 154 sec after trigger time at 2026-02-23 04:13:44 UT, with upper limit up to  19.8 mag. The observations began at zenith distance = 32 deg. The sun  altitude  is -48.2 deg. \n\nThe galactic latitude b = -7 deg., longitude l = 243 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=3152151\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n     170 | 2026-02-23 04:13:44 |         MASTER-OAFA | (07h 21m 14.73s , -29d 00m 58.9s) |   C |    30 | 19.3 |        \n     210 | 2026-02-23 04:14:20 |         MASTER-OAFA | (07h 21m 14.73s , -29d 00m 58.0s) |   C |    40 | 19.5 |        \n     262 | 2026-02-23 04:15:07 |         MASTER-OAFA | (07h 21m 14.77s , -29d 00m 57.4s) |   C |    50 | 19.6 |        \n     324 | 2026-02-23 04:16:03 |         MASTER-OAFA | (07h 21m 14.79s , -29d 00m 56.9s) |   C |    60 | 18.9 |        \n     395 | 2026-02-23 04:17:09 |         MASTER-OAFA | (07h 21m 14.83s , -29d 00m 56.3s) |   C |    70 | 19.8 |        \n     603 | 2026-02-23 04:20:17 |         MASTER-OAFA | (07h 22m 38.12s , -29d 04m 33.0s) |   C |   110 | 19.3 |        \n     730 | 2026-02-23 04:22:15 |         MASTER-OAFA | (07h 22m 38.17s , -29d 04m 33.2s) |   C |   130 | 19.4 |        \n     882 | 2026-02-23 04:24:31 |         MASTER-OAFA | (07h 22m 38.28s , -29d 04m 33.1s) |   C |   160 | 19.5 |        \n     998 | 2026-02-23 04:27:17 |         MASTER-OAFA | (07h 22m 38.38s , -29d 04m 32.8s) |   C |    60 | 18.9 |        \n    1063 | 2026-02-23 04:28:23 |         MASTER-OAFA | (07h 22m 38.43s , -29d 04m 32.7s) |   C |    60 | 19.2 |        \n    1129 | 2026-02-23 04:29:29 |         MASTER-OAFA | (07h 22m 38.49s , -29d 04m 32.7s) |   C |    60 | 19.1 |        \n    1196 | 2026-02-23 04:30:35 |         MASTER-OAFA | (07h 22m 38.53s , -29d 04m 32.7s) |   C |    60 | 19.1 |        \n    1261 | 2026-02-23 04:31:40 |         MASTER-OAFA | (07h 22m 38.57s , -29d 04m 32.8s) |   C |    60 | 18.9 |        \n    1326 | 2026-02-23 04:32:46 |         MASTER-OAFA | (07h 22m 38.61s , -29d 04m 33.1s) |   C |    60 | 18.9 |        \n    1393 | 2026-02-23 04:33:52 |         MASTER-OAFA | (07h 22m 38.66s , -29d 04m 33.1s) |   C |    60 | 19.0 |        \n    1458 | 2026-02-23 04:34:58 |         MASTER-OAFA | (07h 22m 38.71s , -29d 04m 33.0s) |   C |    60 | 18.8 |        \n    1524 | 2026-02-23 04:36:04 |         MASTER-OAFA | (07h 22m 38.76s , -29d 04m 33.3s) |   C |    60 | 19.2 |        \n    1591 | 2026-02-23 04:37:10 |         MASTER-OAFA | (07h 22m 38.81s , -29d 04m 33.5s) |   C |    60 | 19.2 |        \n    1656 | 2026-02-23 04:38:15 |         MASTER-OAFA | (07h 22m 38.85s , -29d 04m 33.5s) |   C |    60 | 19.2 |        \n    1721 | 2026-02-23 04:39:21 |         MASTER-OAFA | (07h 22m 38.89s , -29d 04m 33.7s) |   C |    60 | 19.1 |        \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",
  "submittedHow": "email"
}