GCN Circular 30230
Subject
GRB 210610B: Further SAO RAS optical observations
Date
2021-06-13T14:58:18Z (3 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
A. S. Moskvitin and O. A. Maslennikova (SAO RAS),
report on behalf of the GRB follow-up team.
We observed the field of the GRB 210610B (Page et al., GCN #30170)
with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer in BVRc
Johnson-Cousins filters on June 11 and 12.
The GRB OT is clearly detected in the stacked frames
with the following brightness.
Date UT_start UT_end Exp., s T_mid-T0, d R mag
June 11 18:54:36--20:03:45 4 x 300 0.98453 19.33 +/- 0.01
June 11 23:14:36--23:49:13 5 x 300 1.15309 19.62 +/- 0.02
June 12 21:28:37--22:47:50 6 x 300 2.09498 20.67 +/- 0.06
The preliminary photometry is based on the USNO-A2.0 star
from GCN #30178 (Rumyantsev et al.) and previous GCN #30187.
Magnitudes were not corrected for MW extinction.