GCN Circular 30243
N. Pankov (HSE, IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), S. Belkin (IKI), V. R. Ayvazian (AbAO), G. V. Kapanadze (AbAO) report on behalf of IKI GRB FuN: We observed the GRB 210610B (Page et al., GCN 30170) with AS-32 telescope of Abastumani observatory (AbAO) in R-filter on June, 13. The optical afterglow first reported by UVOT (Page et al., GCN 30170) is clearly detected is detected in stacked image. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err. UL(3sigma) (mid, days) (s) 2021-06-13 17:06:46 2.88564 R 72*60 21.25 0.14 22.6 The photometry is based on calibrations stars reported in (Pankov et al., GCN 30213).