GCN Circular 29689
Subject
GRB 210321A: Mondy optical observations
Event
Date
2021-03-22T11:15:29Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (HSE), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI)
report on behalf of GRB IKI FuN:
We observed the field of GRB 210321A (Dichiara et al., GCN 29677) with
AZT-33IK telescope of Sayan observatory (Mondy) starting on 2021-03-21
(UT) 14:20:37. The optical afterglow (Siegel et al., GCN 29679; Butler
et al., GCN 29680; Lipunov et al., GCN 29683; Heintz et al., GCN
29684; de Ugarte Postigo et al., GCN 29685; Xin et al. GCN 29687) is
clearly detected in a combined image. Preliminary photometry of the
afterglow in the combined image is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-03-21 14:20:37 0.31199 R 45*60 20.1 0.14 20.5
The photometry is based on the nearby USNO-B1.0 stars
USNO-B1.0_id R2
1601-0068003 15.84
1600-0068970 16.18
1601-0068018 16.54
1601-0067995 16.23