{
  "bibcode": "2021GCN.30440....1P",
  "body": "N. Pankov (HSE, IKI), S. Belkin (IKI), V. Kim (FAI, Pulkovo \nObservatory), A. Pozanenko (IKI), M. Krugov (FAI)  report on behalf of \nGRB IKI FuN:\n\nWe observed GRB 210704A  (Ursi et al., GCN 30372; Berretta et al., GCN \n30375; Prasad et al., GCN 30378; D'Ai et al., GCN 30379; Malacaria et \nal., GCN 30380; Ridnaia et al., GCN 30388)  with AZT-20 telescope of \nAssy-Turgen observatory starting on 2021-07-08 (UT) 16:59:54. We do not \ndetect the optical afterglow (Kim et al., GCN 30384; D'Avanzo et al., \nGCN 30385; Troja et al., GCN 30390; Kann et al., GCN 30391, 30401; Sun \net al., GCN 30411; D'Avanzo et al., GCN 30432; Rastinejad  et al., GCN \n30433;  Watson et al., GCN 30436).\n\nPreliminary photometry of the filed is following\n\nDate       UT start  t-T0       Exp.   Filter  OT    Err.  UL(3sigma)\n                     (mid, days)  (s)\n2021-07-08 16:59:54  3.92014    77*60    r'    n/d   n/d   23.1\n\nThe photometry is based on the nearby PS1 stars.\n\nOur photometry is consistent with observations of (D'Avanzo et al., GCN \n30432; Watson et al., GCN 30436).",
  "circularId": 30440,
  "createdOn": 1625959456000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210704A: Assy optical afterglow upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210704A"
}