{
  "bibcode": "2012GCN.13065....1R",
  "body": "V. Rumyantsev, N. Pit' (CrAO), A. Pozanenko (IKI) report on behalf of larger \nGRB follow-up collaboration:\n\nWe observed the field of GRB 120312A (Stamatikos  et al., GCN 13049) with \nAZT-11  telescope of CrAO observatory starting on March 12  (UT) 23:21:13 \nunder moderate weather conditions and  seeing  of about 2.4 arsces.  Within \nenhanced Swift-XRT position (Mangano et al., GCN 13053) we do not detected \nany optical source, in particular afterglow candidate (Tanvir et al., GCN \n13055). A photometry is based on the  USNO-B1.0 star 1138-0244157 \n(16:47:09.53 +23:51:17.4)  assuming R=17.3:\n\nT_start UT  T0+        Filter, Exposure, OT,  uplim (3 sigma)\n                  (mid, d)            (s)\n\n23:21:13  0.3291       R     26x180    n/d     20.75",
  "circularId": 13065,
  "createdOn": 1331760932000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 120312A: CrAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 120312A"
}