GCN Circular 30215
Subject
GRB 210610B: CrAO/ZTSH optical observations and light curve
Event
Date
2021-06-11T23:23:01Z (5 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:
We observed the GRB 210610B (Page et al., GCN 30170) with ZTSH 2.6m
telescope of CrAO observatory starting on June 10 (UT) 20:19:24
(Rumyantsev et al., GCNs 30175, 30178). The optical afterglow first
reported by UVOT (Page et al., GCN 30170) is clearly detected in each
of a single image of 10 exposure in each of BVRI filters on June 10.
Based on our observations on June 10 (B, R - filters) and June 11
(Pankov et al., GCN 30213) we report the light curve (LC) of the
afterglow which can be found in
http://grb.rssi.ru/GRB210610B/GRB210610B_LC.png
Initial phase of the LC from 0.02 days and up to 0.07 days can be
approximated by a single power law with index of -0.9, and after that we
observe plateau phase at least up to 0.18 days after trigger (see figure
above).