{
  "bibcode": "2021GCN.30505....1K",
  "body": "V. Kim (FAI, Pulkovo Observatory), A. Pozanenko (IKI), N. Pankov (HSE, \nIKI),   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 \n21-07-24 (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, 30494; Kumar et al., GCN 30481; Butler et al., GCN 30484; \nThoene et al., GCN 30487; Jelinek et al., GCN 30492; Fu et al., GCN  30504).\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\n2021-07-24 20:56:07   n/d       42*60    r'     21.3  0.2   21.7\n\nThe photometry is based on the nearby PS1 stars.\n\nThe photometry is  still compatible with the single power law of the \nafterglow light curve.",
  "circularId": 30505,
  "createdOn": 1627200828000,
  "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"
}