GCN Circular 28725
Subject
GRB 201020B: Mondy optical observations
Event
Date
2020-10-21T17:09:41Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov
(HSE), A. Volnova (IKI) report on behalf of IKI GRB FuN:
We observed the field of GRB 201020B (Fermi GBM team, GCN 28702;
Malacaria et al., GCN 28710; Arimoto et al., GCN 28716; Ursi et al., GCN
28714; Ridnaia et al., GCN 28723) with AZT-33IK telescope of Sayan
observatory (Mondy) starting on Oct. 21 (UT) 14:20:10. The optical
transient (Lipunov et al. GCN 28718; Xu et al. GCN 28719) is well
detected in our images in R-filter.
Preliminary photometry of the optical transient in a combined image is
following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2020-10-21 14:20:10 0.88629 R 60*60 18.99 0.03 22.7
The photometry is based on the nearby USNO-B1.0 stars
USNO-B1.0_id R2
1670-0037414 16.74
1670-0037586 16.16