GCN Circular 29286
Subject
GRB 210104A: Mondy optical observations, light curve
Event
Date
2021-01-10T22:34:47Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), V. Kim (FAI,
Pulkovo Observatory), Y. Aimuratov (FAI), M. Krugov (FAI) report on
behalf of GRB IKI FuN:
We observed GRB 210104A (Fermi GBM team, GCN 29232; Troja et al., GCN
29233; Frederiks et al., GCN 29258; Cherry et al., GCN 29268) with
AZT-33IK telescope of Sayan observatory (Mondy). 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, 29265;
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; Romanov, GCN 29269; Anandagoda et
al., GCN 29273; Gokuldass, GCN 29274; Mao et al., GCN 29275; Moskvitin
et al., GCN 29277).
Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT Err. UL(3 sigma)
(mid, days) (s)
2021-01-07 15:10:23 3.19681 R 80*90 n/d n/d 22.1
2021-01-08 15:22:18 4.20438 R 59*120 22.2 0.2 22.9
2021-01-09 11:51:54 5.07980 R 90*120 22.7 0.3 22.7
The photometry is based on nearby stars of USNO-B1.0
USNO-B1.0_id R2
1546-0139059 15.53
1546-0139029 14.82
A light curve of the afterglow based on our observations including
reported early (Kim et al., GCN 29238, 29265, 29283) can be found in
http://grb.rssi.ru/GRB210104A/GRB210104A_LC.png