GCN Circular 31426
Subject
GRB 220107A: further SAO RAS optical observations
Event
Date
2022-01-09T23:40:53Z (5 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
A. Moskvitin (SAO) and A. Medvedev (SAO),
on behalf of larger GRB follow-up team report:
We observed the field of GRB 220107A (The Fermi GBM team, GCN 31399;
Kunzweiler et al. GCN 31400; DeLaunay et al. GCN 31402; Suresh et al.,
GCN 31408) with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer.
6 x 300 sec. images were obtained in Rc band on January 9,
22:27:09 -- 23:10:20 UT (T_mid - T0 = 2.3356 days).
The OT (Hosokawa et al. GCN 31413; Siegel GCN 31415; Zhu et al.
GCN 31416; Pankov et al., GCN 31419; Moskvitin et al., GCN 31422;
Castro-Tirado et al., GCN 31423) is clearly visible in the stacked
frame. Preliminary photometry of the afterglow is R = 21.01 +/- 0.04
(based on nearby SDSS-DR12 stars mentioned in GCN 31422).