GCN Circular 29238
Subject
GRB 210104A: Assy optical observations
Event
Date
2021-01-04T14:22:05Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Kim (FAI, Pulkovo Observatory), A. Pozanenko (IKI), M. Krugov (FAI),
S. Belkin (IKI) report on behalf of GRB-IKI-FuN:
We observed the GRB 210104A (Fermi GBM team, GCN 29232; Troja et al.,
GCN 29233) with AZT-20 telescope of Assy-Turgen observatory starting on
Jan. 04 (UT) 12:55:33 in r'-filter. We detect the optical afterglow
(Troja et al., GCN 29233; Xin et al., GCN 29235; Hu et al., GCN 29236;
Hosokawa et al., GCN 29237).
Preliminary photometry of the afterglow obtained in a few initial
imaging is following
Date UT start t-T0 Filter Exp. OT Err. UL (3sigma)
(mid, days) (s)
2021-04-01 12:55:33 0.0632 r'(AB) 5*60 17.97 0.06 22.7
The photometry is based on nearby stars of PanSTARRS-PS1.
Observations is continuing.