{
  "bibcode": "2005GCN..3701....1S",
  "body": "D. Sharapov,  M. Ibrahimov (MAO), V.Rumyantsev (CrAO), A.Pozanenko (IKI) on\nbehalf of larger GRB follow up collaboration report:\n\n\nWe observed the error box of GRB050713b (Trigger #145754; Vaughn et al., GCN\n3590,   Parsons et al., GCN 3600) with 1.5m telescope (Maidanak Astronomical\nObservatory) on July 13, 14, and 15. Limiting magnitude of stacked image of\nobservation obtained on July 13 (start time July 13 UT 18:06, i.e. ~6.0 h\nafter burst) is R=23.2.   We detected optical sources S1 which is offset\n~1.9\narcsec of the refined XRT error circle (Page et al., GCN3602) and have the\nfollowing coordinates (uncertainty in each coordinate is about 1 arcsec):\n\nS1 RA(J2000)= 20 31 15.96   Dec(J2000) = +60 56 36.4\n\nPhotometry of the source based on USNO A2.0 catalog is following:\n\nMean time         Exposure   S1\n  (UT)               sec.    mag.\n\nJuly 13, 18:56    15x300     24.13 +/-0.74\nJuly 14, 19:44     8x300     22.90 +/-0.44\nJuly 15, 19:31     9x300     22.93 +/-0.30\n\n\nSince the S1 source does not demonstrate fading behavior, it is unlikely\nthat S1\nis an OT of GRB050713b.\n\nStacked image of July 13 observations can be found in\nhttp://grb.rssi.ru/GRB050713b.\n\nThis message may be cited.",
  "circularId": 3701,
  "createdOn": 1122671139000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB050713b: Maidanak optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 050713B"
}