{
  "subject": "GRB 250322A: MASTER optical observation",
  "submittedHow": "email",
  "body": "\nV.Lipunov, E.Gorbovskoy, A.Kuznetsov, G.Antipov,D.Vlasenko,K.Zhirkov, P.Balanutsa, N.Tyurina, Ya.Kechin,\nA.Chasovnikov, V.Topolev, V.Senik, K.Labzina (Lomonosov MSU),\nD.Buckley (SAAO),\nC.Francile,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),\nA.Sosnovskij (Crao RAS),\nO.Gress, N.Budnev, O.Ershova (ISU),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),\nR.Rebolo (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez,J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\n\nMASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)\nlocated in South African Astronomical Observatory was pointed to the SWIFT (GCN 39835, Gupta et al.)\nGRB250322A (trigger No 1297832,07h 06m 56.00s , +07d 11m 56.0s, R=0.05) errorbox\n4876 sec after notice time (5017 sec after trigger time) at 2025-03-22 17:29:49 UT,with upper limit up to  18.5 mag.\n Observations started at twilight.\nThe observations began at zenith distance = 39 deg. The sun  altitude  is -9.8 deg.\n\nThe galactic latitude b =  7 deg., longitude l = 209 deg.\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id=2820337\n\nWe obtain the following upper limits.\n\nTmid-T0  |          Site       |Filt.| Expt. | Limit| Comment\n    5032 |         MASTER-SAAO |   C |    30 | 16.7 |\n    5077 |         MASTER-SAAO |   C |   120 | 17.4 |  Coadd\n    5082 |         MASTER-SAAO |   C |    30 | 16.8 |\n    5146 |         MASTER-SAAO |   C |    60 | 16.9 |\n    5226 |         MASTER-SAAO |   C |    60 | 17.0 |\n    5320 |         MASTER-SAAO |   C |    90 | 17.0 |\n    5415 |         MASTER-SAAO |   C |    60 | 17.4 |\n    5494 |         MASTER-SAAO |   C |    60 | 17.4 |\n    5559 |         MASTER-SAAO |   C |    30 | 17.4 |\n    5604 |         MASTER-SAAO |   C |   120 | 18.2 |  Coadd\n    5608 |         MASTER-SAAO |   C |    30 | 17.5 |\n    5672 |         MASTER-SAAO |   C |    60 | 17.6 |\n    5752 |         MASTER-SAAO |   C |    60 | 17.7 |\n    5812 |         MASTER-SAAO |   C |   180 | 18.3 |  Coadd\n    5831 |         MASTER-SAAO |   C |    60 | 17.8 |\n    5910 |         MASTER-SAAO |   C |    60 | 17.8 |\n    6020 |         MASTER-SAAO |   C |   120 | 17.6 |\n    6129 |         MASTER-SAAO |   C |    60 | 17.8 |\n    6209 |         MASTER-SAAO |   C |    60 | 17.9 |\n    6289 |         MASTER-SAAO |   C |    60 | 17.9 |\n    6398 |         MASTER-SAAO |   C |   120 | 17.8 |\n    6537 |         MASTER-SAAO |   C |   120 | 17.8 |\n    6677 |         MASTER-SAAO |   C |   120 | 17.9 |\n    6816 |         MASTER-SAAO |   C |   120 | 17.9 |\n    6961 |         MASTER-SAAO |   C |   120 | 17.7 |\n    7036 |         MASTER-SAAO |   C |   270 | 18.1 |  Coadd\n    7100 |         MASTER-SAAO |   C |   120 | 17.6 |\n    7194 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7243 |         MASTER-SAAO |   C |    30 | 17.9 |\n    7273 |         MASTER-SAAO |   C |    90 | 18.5 |  Coadd\n    7292 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7342 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7391 |         MASTER-SAAO |   C |    30 | 17.9 |\n    7421 |         MASTER-SAAO |   C |    90 | 18.4 |  Coadd\n    7440 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7490 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7539 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7569 |         MASTER-SAAO |   C |    90 | 18.5 |  Coadd\n    7588 |         MASTER-SAAO |   C |    30 | 17.8 |\n    7637 |         MASTER-SAAO |   C |    30 | 17.9 |\n    7687 |         MASTER-SAAO |   C |    30 | 17.7 |\n    7736 |         MASTER-SAAO |   C |    30 | 17.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
  "createdOn": 1742669274566,
  "circularId": 39838,
  "eventId": "GRB 250322A",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "bibcode": "2025GCN.39838....1L"
}