{
  "bibcode": "2010GCN.11154....1A",
  "body": "K. Antoniuk, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of \nlarger GRB  follow-up collaboration:\n\nWe observed the field of the Swift GRB 100823A (Mangano et al. GCN 11135) \nwith AZT-11 telescope of CrAO observatory. Several images in R-filter were \nobtained on Aug. 23 between (UT) 22:05 - 22:53.\n\nIn enhanced XRT position (Goad et al. GCN 11136) we do not detect any source \nup to R=20.7. The photometry of stacked image is based on  USNO-B1.0 star \n0958-0013520 located at RA(J2000) = 01:22:45.50, DEC(J2000) = +05:49:03.0 \n(assuming R=16.75):\n\n t-T0,       Filter,   Exposure,    OT,       Upper limit (3 sigma)\n(mid, d)               (s)\n 0.2111   R         15*180         n/d           20.7",
  "circularId": 11154,
  "createdOn": 1282941922000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 100823A: optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 100823A"
}