{
  "bibcode": "2014GCN.16247....1V",
  "body": "A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), I. Korobtsev\n(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up \ncollaboration:\n\nWe observed the optical afterglow (Elenin et al., GCN 16143; Kaur et \nal., GCN 16144; Ferrante et al., GCN 16145; Chester et al., GCN 16147;\nMaehara et al., GCN 16151) of the Swift GRB 140423A (Sonbas et al.,\nGCN 16142) with AZT-33IK telescope of Sayan observatory (Mondy). We took \nseveral images in R-filter of 60 s exposure on Apr., 25 and\nof 120 s exposure on Apr., 26 and 27.\n\nThe details of the photometry are the following:\n\ndate        UT start   t-T0       Filter  Exp.    OT\n                       (mid, days)          (s)\n2014-04-25  16:36:21  2.36772     R       90*60   22.63+/-0.10\n2014-04-26  15:56:26  3.34068     R       46*120  23.46+/-0.18\n2014-04-27  14:15:32  4.27964     R       54*120  > 22.9\n\nThe photometry is based on two SDSS stars, R (gri -> R transformations \nby Lupton 2005):\n\nSDSS id                      R\nJ130911.04+494854.6   20.209+/-0.053\nJ130924.79+494946.6   19.533+/-0.038",
  "circularId": 16247,
  "createdOn": 1399915969000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 140423A: Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 140423A"
}