{
  "bibcode": "2021GCN.30215....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 210610B (Page  et al., GCN 30170) with ZTSH 2.6m\ntelescope of CrAO observatory starting on June 10 (UT) 20:19:24 \n(Rumyantsev et al., GCNs 30175, 30178).  The optical afterglow  first \nreported by UVOT (Page  et al., GCN 30170) is clearly detected in each \nof a single image of 10 exposure in each of BVRI filters on June 10. \nBased on our observations on June 10 (B, R - filters) and June 11 \n(Pankov et al., GCN 30213) we report the light curve (LC) of the \nafterglow which can be found in\n\nhttp://grb.rssi.ru/GRB210610B/GRB210610B_LC.png\n\nInitial phase of the LC from 0.02 days and up to 0.07 days can be \napproximated by a single power law with index of -0.9, and after that we \nobserve plateau phase at least up to 0.18 days after trigger (see figure \nabove).",
  "circularId": 30215,
  "createdOn": 1623453781000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210610B: CrAO/ZTSH optical observations and light curve",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210610B"
}