{
  "bibcode": "2021GCN.29616....1B",
  "body": "S. Belkin (IKI),  A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE) \nreport  on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 210306A (D'Elia et al., GCN 29597; Ohno et \nal., GCN 29602) with AZT-33IK telescope of Sayan observatory (Mondy) \nstarting on 2021-03-06  (UT) 14:50:30. The optical afterglow (D'Elia et \nal., GCN 29597; Watson et al., GCN 29598; Romanov, GCN 29599; \nStrausbaugh et al., GCN 29600; Hentunen et al., GCN 29603; Stecklum et \nal., GCN 29604; Lipunov et al. GCN 29606, Zhu et al. GCN 29607; Hosokawa \net al., GCN  29608) is clearly detected in a combined image. Preliminary \nphotometry of the object in a combined image is following\n\nDate       UT start   t-T0       Filter Exp.    OT    Err.  UL(3sigma)\n                       (mid, days)        (s)\n\n2021-03-06 14:50:30   0.47677    R      30*120  20.48 0.05  22.0\n\nThe photometry is based on the nearby USNO-B1.0 stars\nUSNO-B1.0_id R2\n1501-0181731 15.23\n1502-0183049 17.69\n1501-0181697 17.1",
  "circularId": 29616,
  "createdOn": 1615148490000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210306A: Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210306A"
}