{
  "bibcode": "2013GCN.15186....1V",
  "body": "A. Volnova (IKI), N. Minikulov (Institute of Astrophysics), M.Gulyamov \n(Institute of Astrophysics), I. Molotov (KIAM), A. Pozanenko (IKI) \nreport on behalf of  larger GRB follow-up collaboration:\n\nWe observed the afterglow  (Hagen et al., GCN  15139; Guidorzi et al., \nGCN 15140) of the Swift GRB 130831A (Hagen et al., GCN  15139)  with \nAZT-8 (0.7m) telescope of Gissar observatory in R filter starting on \nAug. 31 (UT) 17:47:54. A preliminary photometry of combined image is \nbased on  SDSS DR9 stars\n\nT_start              T0+       Filter, Exposure, OT,    OT_err\n(UT)                 (mid, d)            (s)\n\n2013-08-31T17:47:54  0.21932   R       57x60     18.28  0.04\n\nReference stars SDSS-DR9, (R mag, transformation by Lupton 2005)\n\nN\tSDSS id\t\t\tR(Lupton)errR\n1\tJ235443.71+292539.3\t13.491\t 0.016\n2\tJ235438.60+292547.3\t14.136\t 0.015\n3\tJ235423.64+292452.8\t17.120\t 0.016",
  "circularId": 15186,
  "createdOn": 1378597427000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 130831A: optical observation in Gissar AO",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 130831A"
}