{
  "bibcode": "2013GCN.14582....1R",
  "body": "V. Rumyantsev (CrAO), K.Antoniuk (CrAO),  D. Shakhovskoy (CrAO), A. \nPozanenko (IKI) report on  behalf of larger GRB follow-up collaboration:\n\nWe continue observation of the Swift GRB 130427A (Maselli et  al., GCN \n14448)  with AZT-11 telescope of CrAO observatory. Preliminary \nphotometry the optical afterglow of GRB 130427A (Maselli et al., GCN \n14448, Elenin et al. GCN 14450, Perley GCN 14451) is following\n\nT_start (UT)             T0+     Filter Exp.  OT\n                          mid,days       s     mag\n2013-05-02T19:34:45.35   5.5618  R      6120  19.75 +/- 0.15\n2013-05-03T20:41:27.17   6.5581  R      3600  20.30 +/- 0.25\n2013-05-04T18:26:22.25   7.4747  R      5400  20.20 +/- 0.18\n\nPhotometry is based on SDSS star\nSDSS id             B      eB    V      eV    R      eR    I      eI\nJ113220,11+274133,5 17,421 0,020 16,911 0,020 16,561 0,015 16,124 0,016",
  "circularId": 14582,
  "createdOn": 1367792980000,
  "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"
}