GCN Circular 31020
Subject
GRB 211023A: Terskol optical observations
Event
Date
2021-10-28T18:01:05Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI, HSE), I. Sokolov (INASAN, KIAM), D. Berezin (IC AMER
NASU), A. Pozanenko (IKI), N. Pankov (IKI, HSE), G. Butenko (IC AMER
NASU) report on behalf of GRB IKI FuN:
We observed the GRB 211023A (Fermi GBM team, GCN 30958) with Zeiss-2000
telescope and Zeiss-600 telescope of Terskol observatory. 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 31004,31018) is
clearly detected with Zeiss-2000 and marginally detected with
Zeiss-600. Preliminary photometry of the afterglow is following.
Date UT start t-T0 Filter Exp. OT Err. UL. Telescope
(mid, days) (s)
2021-10-26 15:08:26 3.11542 R 29*180 20.59 0.16 21.8 Zeiss-2000
2021-10-28 01:06:22 4.51191 R 11*180 20.91 0.10 22.5 Zeiss-2000
2021-10-28 00:15:55 4.47895 R 39*60 20.80 0.40 20.7 Zeiss-600
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
The updated light curve can be found in
http://grb.rssi.ru/GRB211023A/GRB211023A_LC.png