{
  "bibcode": "2021GCN.29423....1B",
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), V. R. \nAyvazian (AbAO),  G. V. Kapanadze (AbAO), N. Pankov (HSE, IKI)  report \non behalf of IKI-GRB-FuN:\n\nWe observed the field of  GRB 210207B (Lien et al., GCN 29420) with \nAS-32 telescope of Abastumani observatory (AbAO) in R-filter starting on \n  2021-02-08 (UT) 02:14:17. The optical afterglow (Lien et al., GCN \n29420; Kumar et al., GCN 29421) is not detected in stacked image.\n\nDate       UT start   t-T0    Filter  Exp.   OT    Err.  UL(3sigma)\n                        (mid, days)     (s)\n\n\n2021-02-08 02:14:17   0.19837  R      47*60   n/d  n/d   18.7\n\n\nThe photometry is based on nearby USNO-B1.0 stars\nUSNO-B1.0_id R2\n1436-0267956 15.29\n1436-0268040 15.52\n\nThe non-detection of the afterglow implies a jet break somewhere before \nof our observations, or the source of the  GRB 210207B is highly redshifted.",
  "circularId": 29423,
  "createdOn": 1612781696000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210207B: AbAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210207B"
}