{
  "bibcode": "2016GCN.19120....1M",
  "body": "E. Mazaeva (IKI),  E. Klunko (ISTP),  A. Volnova (IKI), I. Korobtsev \n(ISTP),  A. Pozanenko (IKI) report on behalf of larger GRB follow-up \ncollaboration:\n\nWe observed the field of Swift GRB 160228A (Malesani et al., GCN 19107) \nwith AZT-33IK telescope of Sayan observatory (Mondy)  starting on Feb.28 \n(UT) 18:31:31. Within enhanced XRT position (Beardmore et al., GCN \n19110) we do not detect any optical object. In particular  we do not \ndetect candidate of optical afterglow (Delvaux et al., GCN 19114). We \nbarely detect extended bluish object mentioned in (Delvaux et al., GCN \n19114). Preliminary photometry  of  a combined image is following\n\n\nDate        UT start   t-T0    Filter   Exp.   UL (3sigma)\n                       (mid, days)       (s)\n\n2016-02-28  18:31:31  0.06044  R       60*60  22.2\n\nPhotometry is base on nearby USNO-B1.0 stars\nUSNO-B.1_id     R2\n1169-0155723    18.59\n1169-0155657    19.12\n1169-0155662    18.92\n1168-0146568    18.65\n1169-0155709    19.49",
  "circularId": 19120,
  "createdOn": 1456774936000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 160228A: Mondy optcial observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 160228A"
}