{
  "bibcode": "2021GCN.30213....1P",
  "body": "N. Pankov (IKI, HSE), A. Pozanenko (IKI), V. Rumyantsev (CrAO),  S. \nBelkin (IKI, HSE)  report on behalf of IKI GRB FuN:\n\nIn the GCN circ. 30212 we we incorrectly reported GRB 210610A instead of \nGRB 210610B. The circular should be read as follows.\n\nWe observed the GRB 210610B (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 nearby USNO-B1.0 (R2) stars\nUSNO-B1.0 id\nUSNO_B10-1043-00282648\nUSNO_B10-1043-00282621",
  "circularId": 30213,
  "createdOn": 1623447358000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210610B: CrAO/ZTSH optical observations (correction to the GCN circ. 30212)",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210610B"
}