{
  "bibcode": "2022GCN.32684....1B",
  "body": "S. Belkin (IKI, HSE), S. Nazarov (CrAO), A. Pozanenko (IKI),  N. Pankov \n(HSE)  report on behalf of IKI GRB FuN:\n\nWe observed GRB 221009A/Swift J1913.1+1946 (Dichiara et al., GCN 32632; \nKennea and Williams, GCN  32635; Veres et al., GCN  32636; Bissaldi et \nal., GCN  32636; Svinkin et al., GCN 32641; Piano et al., GCN 32657; \nPillera et al., GCN 32658;  Gotz et al., GCN 32660;  Frederiks et al., \nGCN 32668)  with Sintez-Newton 350mm f/5 telescope equipped with QHY600M \ncamera and g'r'i'z' filters.  Observation started on 2022-10-10 (UT) \n17:24:54. The series consists of images with an exposure of 120 s in \nr'-filter.\n\nIn the stacked image we clearly detect the optical afterglow (e.g. \nDichiara et al., GCN 32632; Lipunov et al., GCN 32634; Perley GCN 32638; \nHu et al., GCN 32644; Belkin  et al., GCN 32645; Kuin et al., GCN 32656; \nKim et al., GCN 32670). Preliminary photometry of the afterglow is following\n\n\nPreliminary photometry of the stacked images is following\n\nDate       UT start   t-T0    Filter Exp.    OT    err   UL(3)\n                      (mid, days)       (s)\n2022-10-10 17:24:54   1.16293  r'    40*120  18.43 0.10  20.9\n\nThe photometry is based on nearby PS1 stars",
  "circularId": 32684,
  "createdOn": 1665493280000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 221009A: Sintez-Newton/CrAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 221009A"
}