{
  "bibcode": "2021GCN.29634....1B",
  "body": "S. Belkin (IKI), N. Pankov (HSE), A. Pozanenko (IKI), E. Klunko (ISTP), \nR. Ya. Inasaridze (AbAO), V. R. Ayvazian (AbAO),  G. V. Kapanadze \n(AbAO), D. G. Datashvili (AbAO) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of  GRB 210308A (D'Elia et al., GCN 29619) with \nAZT-33IK telescope of Sayan observatory (Mondy) starting on  2021-03-08 \n(UT) 13:00:45 and AS-32 telescope of Abastumani observatory (AbAO) \nstarting on  2021-03-08 (UT) 16:32:07 (both in R-filter). The optical \nafterglow (D'Elia et al., GCN 29619; Gropp et al., GCN 29630; see also \nOgata et al., GCN 29621; Zhu et al., GCN 29623; Lipunov et al., GCN \n29627) is detected in stacked image of AZT-33IK and not detected at AS-32.\n\nDate       UT start   t-T0    Filter  Exp.   OT    Err.  UL(3sigma)\n                        (mid, days)     (s)\n\n2021-03-08 13:00:45   0.27626  R      15*120 22.77  0.27 22.8 AZT-33IK\n2021-03-08 16:32:07   0.42131  R      25*60  n/d    n/d  21.8 AS-32\n\nThe photometry is based on nearby USNO-B1.0 stars\nUSNO-B1.0_id R2\n1274-0090800 15.34\n1274-0090824 17.35",
  "circularId": 29634,
  "createdOn": 1615270436000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210308A: Mondy and AbAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210308A"
}