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GCN Circular 30215

GRB 210610B: CrAO/ZTSH optical observations and light curve
2021-06-11T23:23:01Z (3 years ago)
Alexei Pozanenko at IKI, Moscow <>
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

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 
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