{
  "bibcode": "2013GCN.14581....1R",
  "body": "V. Rumyantsev (CrAO), K.Antoniuk (CrAO), A. Pozanenko (IKI) report on \nbehalf of larger GRB follow-up collaboration:\n\nWe observed the field of the Swift GRB 130502A (Troja et al., GCN 14527) \nwith AZT-11 telescope of CrAO observatory on May 02 starting on (UT) \n18:20:46, i.e. ~30 min after burst trigger. We took several images in \nR-filter of 180 s exposure.  Within enchanced XRT position (Beardmore et \nal., GCN  14536) we do  not detect any source. Preliminary photometry of \na combined image is following\n\nT_start (UT)           T0+     Filter  Exp. OT  UpperLimit (3 sigma)\n                        mid,days        s\n\n2013-05-02T18:20:46.18 0.0419  R      3600  n/d 20.8\n\nThe photometry is based on USNO-B1.0  star 0898-0181247\n09 14 15.80 -00 08 13.7 assuming R=18.02.",
  "circularId": 14581,
  "createdOn": 1367792732000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 130502A: optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 130502A"
}