{
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@sai.msu.ru>",
  "eventId": "GRB 250725A",
  "subject": "Swift GRB 250725A: Global MASTER-Net observations report",
  "editedOn": 1753709017454,
  "format": "text/plain",
  "createdOn": 1753408724300,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "version": 2,
  "submittedHow": "email",
  "circularId": 41148,
  "bibcode": "2025GCN.41148....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  (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) was pointed to the Swift GRB250725.08 (trigger No 1336720,02h 21m 32.40s , -82d 47m 02.4s, R=0.05) errorbox  23 sec after notice time and 45 sec after trigger time at 2025-07-25 01:52:22 UT, with upper limit up to  18.3 mag. The observations began at zenith distance = 64 deg. The sun  altitude  is -50.5 deg. \n\nMASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB250725.08 errorbox  30 sec after notice time and 53 sec after trigger time at 2025-07-25 01:52:29 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 53 deg. The sun  altitude  is -46.5 deg. \n\nThe galactic latitude b = -34 deg., longitude l = 300 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=2947351\n\nWe obtain a following upper limits.  \n\nTmid-T0  |          Site       |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n      51 |         MASTER-OAFA |   C |    10 | 18.2 |        \n      58 |         MASTER-SAAO |  P/ |    10 | 16.1 |        \n      58 |         MASTER-SAAO | P\\\\ |    10 | 16.5 |        \n      67 |         MASTER-OAFA |   C |    10 | 18.3 |        \n      92 |         MASTER-SAAO |  P/ |    20 | 16.8 |        \n      92 |         MASTER-SAAO | P\\\\ |    20 | 17.0 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n"
}