{
  "bibcode": "2020GCN.28768....1B",
  "body": "S. Belkin (IKI),  A. Pozanenko (IKI),  E. Klunko (ISTP), N. Pankov (HSE) \nreport  on behalf of IKI GRB FuN:\n\nWe continued observations of the GRB 201020B (Fermi GBM team, GCN 28702; \nMalacaria et al., GCN 28710; Arimoto et al., GCN 28716; Ursi et al., GCN \n28714; Ridnaia et al., GCN 28723) with AZT-33IK telescope of Sayan \nobservatory (Mondy)  on Oct. 22, 23. The optical afterglow (Lipunov et \nal., GCN 28718; Xu et al., GCN 28719; Belkin et al., GCN 28725; Breeveld \n& Lien, GCN 28743; Vinko et al., GCN 28750; Kumar et al., GCN 28753) \nwith redshift of z= 0.804 (Kann  et al., GCN 28765) is  detected in our \nstacked images in R-filter.\n\nPreliminary photometry of the optical transient in a combined image is \nfollowing\n\nDate       UT start   t-T0       Filter Exp.    OT    Err.  UL(3sigma)\n                       (mid, days)        (s)\n\n2020-10-22 17:35:31   2.02195    R      60*60   20.40 0.05   23.0\n2020-10-23 14:33:52   2.89719    R      32*120  20.99 0.26   21.1\n\n\nThe photometry is based on the nearby USNO-B1.0 stars\nUSNO-B1.0_id R2\n1670-0037414 16.74\n1670-0037586 16.16",
  "circularId": 28768,
  "createdOn": 1603533085000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 201020B: continued Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 201020B"
}