GCN Circular 30213
Subject
GRB 210610B: CrAO/ZTSH optical observations (correction to the GCN circ. 30212)
Date
2021-06-11T21:35:58Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (IKI, HSE), A. Pozanenko (IKI), V. Rumyantsev (CrAO), S.
Belkin (IKI, HSE) report on behalf of IKI GRB FuN:
In the GCN circ. 30212 we we incorrectly reported GRB 210610A instead of
GRB 210610B. The circular should be read as follows.
We observed the GRB 210610B (Page et al., GCN 30170) with ZTSH 2.6m
telescope of CrAO observatory starting on June 11 (UT) 19:46:53. The
optical afterglow first reported by UVOT (Page et al., GCN 30170) is
clearly detected in each of a single image of 120 exposure in R filter.
Preliminary photometry of the afterglow in the first image is following
Date UT start t-T0 Filter Exp. OT err
(mid, days) (s)
2021-06-11 19:46:53 0.99683 R 1*120 19.50 0.12
The photometry is based on nearby USNO-B1.0 (R2) stars
USNO-B1.0 id
USNO_B10-1043-00282648
USNO_B10-1043-00282621