{
  "bibcode": "2013GCN.14474....1V",
  "body": "A. Volnova ( IKI),   D. Shakhovskoy (CrAO),   V. Rumyantsev (CrAO), A. \nPozanenko (IKI) report on behalf of  larger GRB  follow-up collaboration:\n\nWe started observation of the field of  the Swift GRB 130427A (Maselli et \nal., GCN 14448)  with AZT-11 telescope of CrAO observatory on Apr. 27 (UT) \n18:21:45 in VRI filters. We clearly detect  still bright optical counterpart \nof GRB 130427A (Maselli et al., GCN 14448, Elenin et al. GCN 14450, Perley \nGCN 14451).    Preliminary photometry is following\n\n   filter   tstart (UT) exp,s   T-t0,d       OT +/- err\n   R       18:21:45   120      0,76580   16,71 +/- 0,06\n   R       18:27:52   120      0,77005   16,87 +/- 0,06\n   R       18:34:00   120      0,77431   16,83 +/- 0,07\n   R       18:40:07   120      0,77855   16,81 +/- 0,06\n\nObservation is continuing.",
  "circularId": 14474,
  "createdOn": 1367097211000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 130427A: optical observations in CrAO",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 130427A"
}