{
  "bibcode": "2025GCN.39801....1L",
  "eventId": "GRB 250321A",
  "submittedHow": "email",
  "body": "V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,\nA.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,\nV.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. 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  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 250321A ( Fermi GBM team, GCN 39793) errorbox  25226 sec after notice time and 25261 sec after trigger time at 2025-03-21 07:43:40 UT, with upper limit up to  17.1 mag. The observations began at zenith distance = 82 deg. The sun  altitude  is -37.1 deg. \n\nThe galactic latitude b = -6 deg., longitude l = 56 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=2818762\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n   25341 | 2025-03-21 07:43:40 |         MASTER-OAFA | (19h 30m 40.40s , +20d 25m 41.2s) |   C |   160 | 16.0 |        \n   25537 | 2025-03-21 07:46:56 |         MASTER-OAFA | (19h 30m 47.85s , +20d 25m 03.0s) |   C |   160 | 16.4 |        \n   25733 | 2025-03-21 07:50:11 |         MASTER-OAFA | (19h 30m 42.54s , +20d 24m 22.3s) |   C |   160 | 16.7 |        \n   26355 | 2025-03-21 08:00:33 |         MASTER-OAFA | (19h 30m 43.53s , +20d 26m 11.7s) |   C |   160 | 16.4 |        \n   27421 | 2025-03-21 08:19:20 |         MASTER-OAFA | (19h 30m 53.70s , +20d 27m 42.1s) |   C |    40 | 17.0 |        \n   27431 | 2025-03-21 08:19:20 |         MASTER-OAFA | (19h 40m 32.05s , +20d 50m 27.7s) |   C |    60 | 16.6 |        \n   27559 | 2025-03-21 08:20:37 |         MASTER-OAFA | (19h 30m 47.78s , +20d 27m 00.4s) |   C |   160 | 16.8 |        \n   27569 | 2025-03-21 08:20:38 |         MASTER-OAFA | (19h 41m 30.19s , +20d 47m 56.2s) |   C |   180 | 16.7 |        \n   27694 | 2025-03-21 08:23:53 |         MASTER-OAFA | (19h 30m 54.58s , +20d 27m 29.9s) |   C |    40 | 17.1 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n",
  "circularId": 39801,
  "createdOn": 1742545866797,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "subject": "Fermi GRB 250321A: Global MASTER-Net observations report"
}