{
  "bibcode": "2022GCN.32088....1N",
  "body": "S. Nazarov (CrAO), A. Pozanenko (IKI), S. Belkin (IKI, HSE), N. Pankov \n(HSE)  report on behalf of IKI GRB FuN:\n\nWe observed  the GRB 220521A (Dichiara et al., GCN 32076; Fermi GBM \nTeam, GCN 32075) with Sintesz-Newton 350mm f/5 telescope of CrAO \nobservatory. Observation started on 2022-05-22 (UT) 01:05:40. The series \nconsists of images with an exposure of 60 s in a Clear filter.\n\nThe optical afterglow  (Malesani et al., GCN 32078; Fynbo et al., GCN \n32079; Goranskij et al., GCN 32082) is not detected in the stacked image.\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)\n\n2022-05-22 01:05:40   0.07626  Clear 9*60    n/d  n/d   18.2\n\n\nThe photometry is based on nearby USNO-B1.0 (R2) stars\nRA DEC R2\n18:21:04.76880 +10:21:04.7232 16.26\n18:21:07.39800 +10:20:37.5000 16.73",
  "circularId": 32088,
  "createdOn": 1653232642000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 220521A: Sintesz-Newton/CrAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 220521A"
}