{
  "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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250217C ( Fermi GBM team, GCN 39357) errorbox  588 sec after notice time and 626 sec after trigger time at 2025-02-18 00:05:08 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 74 deg. The sun  altitude  is -42.9 deg. \n\nThe galactic latitude b = 38 deg., longitude l = 191 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=2781342\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n     657 | 2025-02-18 00:05:08 |         MASTER-SAAO | (08h 45m 43.52s , +32d 50m 06.0s) |   C |    60 | 17.9 |        \n     717 | 2025-02-18 00:05:08 |         MASTER-SAAO | (08h 45m 43.52s , +32d 50m 05.9s) |   C |   180 | 18.5 |  Coadd \n     736 | 2025-02-18 00:06:27 |         MASTER-SAAO | (08h 45m 43.62s , +32d 50m 10.7s) |   C |    60 | 17.6 |        \n     815 | 2025-02-18 00:07:46 |         MASTER-SAAO | (08h 45m 43.81s , +32d 50m 10.7s) |   C |    60 | 17.5 |        \n     894 | 2025-02-18 00:09:05 |         MASTER-SAAO | (08h 45m 44.00s , +32d 50m 14.7s) |   C |    60 | 17.6 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n",
  "createdOn": 1739837818256,
  "subject": "Fermi GRB 250217C: Global MASTER-Net observations report",
  "submittedHow": "email",
  "bibcode": "2025GCN.39358....1L",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 250217C",
  "circularId": 39358
}