{
  "bibcode": "2021GCN.30494....1P",
  "body": "N. Pankov (HSE, IKI), V. Kim (FAI, Pulkovo Observatory), A. Pozanenko \n(IKI),  M. Krugov (FAI),  S. Belkin (IKI) report on behalf of GRB IKI FuN:\n\nWe continue observations of of the field of GRB 210722A  (D'Avanzo et \nal., GCN 30475;  Page et al., GCN 30483; Barthelmy et al. GCN 30489; \nWood et al., GCN30490)  with AZT-20 telescope of Assy-Turgen \nobservatory. We obtained several frames  in r' - filter starting on \n21-07-23 (UT) 21:34:39. We clearly detect the bright optical afterglow \n(D'Avanzo et al., GCN 30475; Zhu et al., GCN 30476; Pankov et al., GCN \n30478 & 30488; Kumar et al., GCN 30481; Butler et al., GCN 30484; \nThoene et al., GCN 30487; Jelinek et al., GCN 30492).\n\nPreliminary photometry of the afterglow in the stacked image  is following\n\nDate       UT start  t-T0       Exp.    Filter  OT    Err.  UL(3sigma)\n                     (mid, days)  (s)             (AB)\n\n2021-07-23 21:34:39 1.03677    26*60    r'      20.37 0.07  22.5\n\nThe photometry is based on the nearby PS1 stars.\n\nThe light curve can still be approximated by a single power law with a \nan index of -1.1.",
  "circularId": 30494,
  "createdOn": 1627128635000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210722A: continued Assy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210722A"
}