{
  "bibcode": "2017GCN.21471....1V",
  "body": "A. Volnova  (IKI),  A. Pozanenko (IKI), R. Inasaridze (AbAO),  V. Ayvazian \n(AbAO),  O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO), E. Mazaeva (IKI), \nI. Molotov (KIAM) report on behalf of larger GRB follow-up  collaboration:\n\nWe observed the field of the Swift  GRB 170810A (Gibson  et al., GCN 21450) \nwith AS-32 (0.7m) telescope of Abastumani Observatory starting on August, 11 \n(UT)  17:02:09. We obtained several unfiltered images of the field.   Within \nenhanced XRT error circle  (Goad et al., GCN   21451) we do not detect  the \nafterglow (Rebolo et al, GCN 21449; Gibson  et al., GCN 21450). Preliminary \nphotometry of the field is following\n\nDate        UT start         t-T0            Filter Exp.   OT   Err UpLim (3 \nsigma)\n                       (mid, days)                         (s)\n\n2017-08-11 17:02:09  0.80915   CR     33*20  n/d  n/d 18.2\n\n\nPhotometry is based on nearby SDSS stars  (Lupton transformation)\n\nSDSS id                           R_Lupton\nJ123141.98+033552.6 15.637 0.013\nJ123153.09+033552.7 14.800 0.012\nJ123154.00+033945.4 15.540 0.013",
  "circularId": 21471,
  "createdOn": 1502652578000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 170810A: AbAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 170810A"
}