GCN Circular 29265
Subject
GRB 210104A: Assy continued optical observations
Date
2021-01-05T22:12:02Z (3 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), Y. Aimuratov (FAI) report on behalf of GRB IKI FuN:
We continued observations of the GRB 210104A (Fermi GBM team, GCN 29232;
Troja et al., GCN 29233; Frederiks et al., GCN 29258) with AZT-20
telescope of Assy-Turgen observatory starting on Jan. 05 (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; Kim et al., GCN 29238; Lipunov et al., GCN 29239; Horiuchi et
al., GCN 29241; Breeveld et al., GCN 29247; Zhu et al., GCN 29252; Paek
et al., GCN 29254; Kumar et al., GCN 29257; Smartt et al., GCN 29262).
Preliminary photometry obtained in images in the beginning of
observations on Jan. 05 is following
Date UT start Filter Exp. OT Err.
(s)
2021-01-04 15:35:27 r'(AB) 20*60 20.85 0.07
2021-01-04 16:20:20 r'(AB) 20*60 21.23 0.10
2021-01-04 17:05:11 r'(AB) 20*60 21.19 0.06
The photometry is based on nearby stars of PanSTARRS-PS1.
Observations are continuing.