{
  "bibcode": "2012GCN.13668....1I",
  "body": "A. Ivanov, V. Ivanov, V. Lysenko (Kuban State University), A. Pozanenko \n(IKI)\n\nWe observed the field of the Swift GRB 120816A (Page  et al., GCN 13654) \nwith 20-inch telescope of Kuban State University Astrophysical Observatory \non August 16 starting on (UT) 19:34:49. We took several series of 40 s and \n60 s exposures using R filter. In a stacked image we do not detect any new \nsource in the enhanced XRT error circle (Osborne et al., GCN 13660), in \nparticular we do not detect the OT candidate  (Rau et al., GCN 13657). A \npreliminary photometry is based on the nearby USNO-B1.0 (R2) stars:\n\n Start,         T0+         Filter, Exposure,    OT,   uplim (3 sigma)\n  (UT)         (mid, d)             (s)\n19:34:49   0.0115      R       40               n/d    16.0\n19:36:01   0.0221      R     830               n/d    17.9\n19:36:01   0.0539      R   3530               n/d    18.1",
  "circularId": 13668,
  "createdOn": 1345220226000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 120816A: optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 120816A"
}