{
  "bibcode": "2021GCN.30178....1R",
  "body": "V. Rumyantsev (CrAO), A. Pozanenko (IKI),  S. Belkin (IKI), N. Pankov \n(HSE) report on behalf of GRB IKI FuN:\n\nWe report photometry of  GRB 210610B  afterglow (Page et al., GCN \n30170; Lipunov et al. GCNs 30173, 30176; Kumar et al. GCN 30174; \nRumyantsev et al., GCN  30175; Hu et al., GCN 30177) obtained with ZTSh \n2.6m telescope of CrAO observatory.\n\nPreliminary photometry of the optical afterglow in R- filter is following\n\nDate       UT start    Filter Exp.   OT    Err.  UL(3sigma)\n                               (s)\n\n2021-06-10 20:19:24    R      1*10  16.11  0.02 21.5\n2021-06-10 20:59:50    R      1*10  16.99  0.02 21.2\n\nThe photometry is based on the nearby USNO-A2.0 star\nUSNO-A2.0_id\n1043-0282589 16:15:36.30 +14:23:18.2 R=16.88\n\nWe continue observations in BVRI filters and will report photometry \nafter data receiving.",
  "circularId": 30178,
  "createdOn": 1623365077000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210610B: CrAO/ZTSh optical afterglow photometry",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210610B"
}