{
  "bibcode": "2019GCN.26615....1P",
  "body": "A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE), K. Kamyshnikov \n(HSE), E. Mazaeva (IKI), A. Volnova (IKI) report   on behalf of IKI-GRB-FuN:\n\nWe observed the field of  GRB 191228A (Bernardini et al.  GCN 26601) \nwith AZT-33IK telescope of Sayan observatory (Mondy) starting on Dec. 28 \n(UT)  11:15:09.   We  do not detect any optical object in the Enhanced \nSwift-XRT position  (Evans et al.  GCN 26606). Preliminary photometry of \nthe field  is following.\n\nDate       UT start   t-T0       Filter Exp.    OT       UL(3sigma)\n                       (mid, days)        (s)\n\n2019-12-28 11:15:09    0.48923    R     30*120  n/d      20.1\n\nPhotometry is based on the USNO-B2.0 nearby stars.",
  "circularId": 26615,
  "createdOn": 1577721181000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 191228A: Mondy optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 191228A"
}