{
  "bibcode": "2018GCN.23580....1V",
  "body": "A. Volnova (IKI), I. Reva (FAPHI), A. Pozanenko (IKI), E. Mazaeva (IKI), \nS. Belkin (IKI), A. Kusakin (FAPHI),  M. Krugov (FAPHI) report on behalf \nof larger GRB follow-up collaboration:\n\nWe observed the field of GRB 181228A (Moss et al., GCN 23570; \nBeardmoreet al., GCN 23574) with Zeiss-1000 1-m telescope of Tien Shan \nAstronomical Observatory starting on Dec. 28 (UT) 13:35:51.  We do not \ndetected the OT   (D'Avanzo et al., GCN 23574; Lipunov et al. GCN \n23576). Preliminary photometry of the field is following.\n\nDate       UT start t-T0    Filter Exp.   OT   Err. UL\n                     (mid, days) (s)\n\n2018-12-28 13:35:51 0.46359 R      21*120 n/d  n/d  21.7\n\nThe photometry is based on nearby USNO-B1.0 star\nUSNO-B1.0_id R2\n1032-0046066 16.66",
  "circularId": 23580,
  "createdOn": 1546015762000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 181228A: TSHAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 181228A"
}