GCN Circular 31018
Subject
GRB 211023A: continued Mondy optical observations
Event
Date
2021-10-28T13:05:00Z (4 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 GRB IKI FuN:
We observed the GRB 211023A (Fermi GBM team, GCN 30958) with AZT-33IK
telescope of Sayan observatory (Mondy) starting on 2021-10-26 (UT)
14:47:57. We obtained 17 images in R-filter. The afterglow of the GRB
211023A (Lipunov et al., GCN 30977; Kann et al. GCN 30982; Hu et
al. GCN 30990; Belkin et al., GCN 31004) is clearly detected.
Preliminary photometry of the afterglow in a stacked image is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-10-26 14:47:57 3.09182 R 30*120 20.57 0.06 22.7
The photometry is based on the nearby USNO-B1.0 stars
RA DEC R2
04:53:23.10336 +85:19:26.4720 14.09
04:52:47.26344 +85:22:52.1508 15.75