{
  "bibcode": "2013GCN.15484....1V",
  "body": "A. Volnova (IKI), Yu. Krugly (IA KhNU), R. Inasaridze (AAO), I.\nSlyusarev (IA KhNU),  G. Inasaridze (AAO), V. Zhuzhunadze (AAO),  I.\nMolotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB\nfollow-up collaboration:\n\nWe observed the field of Swift GRB 131108A (Racusin et al., GCN 15464,\nHurley et al. GCN 15466) with  AZT-8  telescope of Institute of\nAstronomy, Kharkiv National University and with AS-32 telescope of\nAbastumani Observatory. We obtained several images in R-filter and\nalso non-fileterd images.   Within the enhanced XRT circle (Stroth &\nKennea, GCN 15474) we detect the optical counterpart reported by\nGorosabel et al. (GCN 15469).\n\nThe details of preliminary photometry are following:\n\nUT start                     t-T0    Filter  Exp.   OT\n                              (mid, days)       (s)\n\n2013-11-10T02:00:12 1.24560 R       15x300  20.92 +/- 0.12\n2013-11-11T00:44:00 2.21609 None    36x120  21.20 +/- 0.11\n\nThe photometry is based the SDSS stars, R magnitude (gri -> R\ntransformations by Lupton 2005):\n\nSDSS id                           R\nJ102559.54+093904.1   16.928 +/- 0.014\nJ102609.18+093958.8   17.999 +/- 0.021\nJ102610.10+093859.6   17.339 +/- 0.014",
  "circularId": 15484,
  "createdOn": 1384409965000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 131108A: optical observations",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 131108A"
}