{
  "bibcode": "2019GCN.23867....1V",
  "body": "A. Volnova (IKI),  A. Pozanenko (IKI),  E. Klunko (ISTP), R. Inasaridze\n(AbAO), E. Mazaeva (IKI), S. Belkin (IKI)  report   on behalf of\nIKI-GRB-FuN:\n\nWe observed the field of localization of  GRB 190204A   (Lien et al. GCN\n23852)    with AZT-33IK telescope of Sayan observatory (Mondy).   We\nstarted observations on Feb. 04 (UT) 13:10:12 in R-filter. We do not\ndetect  the optical afterglow (Lien et al.  GCN 23852; Watson et al.,\nGCN  23861;  Kuin et al., GCN  23863). Preliminary photometry of the\nfield is following.\n\nDate               UT start      t-T0          Filter Exp.   OT     Err.\n  UL\n                                         (mid, days)        (s)\n                (3 sigma)\n\n2019-02-04  13:10:12  0.32583     R      25*120      n/d     n/d   20.3\n\nThe photometry is based on nearby SDSS stars:\nSDSS_id                         R_Lupton\nJ232549.70+545348.8 16.978 0.014\nJ232550.46+545253.5 17.052 0.014\nJ232544.33+545253.6 16.085 0.013\n\n\nOur observation confirm rapid initial decay of the afterglow detected by\nUVOT (Kuin et al., GCN  23863).",
  "circularId": 23867,
  "createdOn": 1549306555000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 190204A: Mondy optical upper limit",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 190204A"
}