{
  "bibcode": "2018GCN.23596....1B",
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), R. Ya. Inasaridze \n(AbAO),  E. Mazaeva (IKI),   A. Volnova (IKI), V. R. Ayvazian (AbAO), \nG. V.  Kapanadze (AbAO)   report   on behalf of the IKI GRB-FuN:\n\nWe observed the field of GRB 181228A (Moss et al., GCN 23570; Beardmore \net al., GCN 23574) with AZT-33IK telescope of Sayan observatory (Mondy) \n   starting on Dec. 28 (UT) 13:48:11 in I-filter, and AS-32 telescope of \nAbastumani Observatory (AbAO) on Dec. 28 (UT) 15:13:46 in R-filter. We \ndo not detected    the afterglow (D'Avanzo et al., GCN 23575; Lipunov et \nal. GCN 23576; Xu et al., GCN 23593).\n\nPreliminary 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 13:48:11 0.47494 I      30*120 n/d  n/d   23.8\n2018-12-28 15:13:46 0.54879 R      63*60  n/d  n/d   21.0\n\n\nThe photometry is based on nearby USNO-B1.0 stars\nUSNO-B1.0_id R2    I2\n1032-0046066 16.66 16.08\n1031-0043284 16.04 15.36",
  "circularId": 23596,
  "createdOn": 1546277830000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 181228A: Mondy and AbAO optical upper limits",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 181228A"
}