GCN Circular 28768
Subject
GRB 201020B: continued Mondy optical observations
Event
Date
2020-10-24T09:51:25Z (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)
report on behalf of IKI GRB FuN:
We continued observations of the 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) on Oct. 22, 23. The optical afterglow (Lipunov et
al., GCN 28718; Xu et al., GCN 28719; Belkin et al., GCN 28725; Breeveld
& Lien, GCN 28743; Vinko et al., GCN 28750; Kumar et al., GCN 28753)
with redshift of z= 0.804 (Kann et al., GCN 28765) is detected in our
stacked 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)
2020-10-22 17:35:31 2.02195 R 60*60 20.40 0.05 23.0
2020-10-23 14:33:52 2.89719 R 32*120 20.99 0.26 21.1
The photometry is based on the nearby USNO-B1.0 stars
USNO-B1.0_id R2
1670-0037414 16.74
1670-0037586 16.16