{
  "bibcode": "2016GCN.19936....1V",
  "body": "A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva \n(IKI), I. Korobtsev (ISTP)  report on behalf of larger GRB follow-up \ncollaboration:\n\nWe observed the field of the GRB 160917A (Racusin et al. GCN 19926) with \n  AZT-33IK telescope of Sayan observatory (Mondy) starting on Sep., 18 \n(UT) 15:25:21. We obtained several images in R-filter. We do not detect \nthe optical source reported as afterglow candidate (Volnova et al. GCN \n19929; Kuin  et al. GCN  19931). Preliminary photometry of the field is \nfollowing\n\nDate        UT start   t-T0      Filter Exp.   OT     UL (3 sigma)\n                        (mid, days)       (s)\n\n2016-09-18  15:25:21   1.18522    R     60*60  n/d    22.0\n\nPhotometry is based on nearby USNO-B1.0 stars used in GCN circ. 19929.\nIn comparison with our previous observation (Volnova et al. GCN 19929) \nthe source is not visible  up to 22.0 mag. The source faded between two \nepochs on at least  1.4 magnitudes and it is most probably the afterglow \nof GRB 160917A. Our observation is compatible with more deep RATIR \nobservation in r-filter (Butler et al. GCN 19933).",
  "circularId": 19936,
  "createdOn": 1474315951000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 160917A: Mondy afterglow confirmation",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 160917A"
}