{
  "bibcode": "2021GCN.29620....1B",
  "body": "S. Belkin (IKI),  A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE) \nreport  on behalf of GRB IKI FuN:\n\nWe continue observations (Belkin et al., GCN 29616)  the field of GRB \n210306A (D'Elia et al., GCN 29597; Ohno et al., GCN 29602) with AZT-33IK \ntelescope of Sayan observatory (Mondy). 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; Dimple et al., GCN 29618) is still detected in a \ncombined image. Preliminary photometry of the afterglow in the combined \nimage is following\n\nDate       UT start   t-T0       Filter Exp.    OT    Err.  UL(3sigma)\n                       (mid, days)        (s)\n\n2021-03-07 13:43:24   1.41281    R      5*120  22.09 0.25  22.1\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": 29620,
  "createdOn": 1615202172000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210306A: continued Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210306A"
}