{
  "bibcode": "2021GCN.30212....1P",
  "body": "N. Pankov (IKI, HSE), A. Pozanenko (IKI), V. Rumyantsev (CrAO),  S. \nBelkin (IKI, HSE)  report on behalf of IKI GRB FuN:\n\nWe observed the GRB 210610A (Page  et al., GCN 30170) with ZTSH 2.6m \ntelescope of CrAO observatory starting on June 11 (UT) 19:46:53.  The \noptical afterglow  first reported by UVOT (Page  et al., GCN 30170) is \nclearly detected in each of a single image of 120 exposure in R filter.\nPreliminary photometry of the afterglow in the first image is following\n\nDate       UT start   t-T0    Filter Exp.    OT      err\n                      (mid, days)       (s)\n\n2021-06-11 19:46:53   0.99683 R      1*120   19.50   0.12\n\nThe photometry is based on several nearby USNO-B1.0 (R2) stars\nUSNO-B1.0 id\nUSNO_B10-1043-00282648\nUSNO_B10-1043-00282621",
  "circularId": 30212,
  "createdOn": 1623446226000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210610A: CrAO/ZTSH optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210610A"
}