GCN Circular 29809
Subject
GRB 210411C: Chilescope optical observations
Date
2021-04-12T20:40:48Z (3 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), M. Krugov (AFIF), N. Pankov (HSE)
report on behalf of IKI-FuN follow-up collaboration:
We observed the Swift GRB 210411C (Sbarrato et al., GCN 29794) with
Chilescope RC-1000 started on April 12 (UT) 07:43:39 in r'-filter. We
clearly detected optical afterglow (Sbarrato et al., GCN 29794;
Strausbaugh et al., GCN 29802; Hu et al., GCN 29803; Lipunov et al., GCN
29804; de Ugarte Postigo et al., GCN 29806; Pessi et al., GCN 29808) in
a stacked image with a total exposure of 3*600 seconds.
Preliminary photometry is following.
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-04-12 07:43:39 0.70333 r' 3*600 21.76 0.16 22.4
The photometry is based on nearby stars from the SkyMapper catalog
SMSS-DR1.1_id r
194633.88-392221.5 17.428
194648.73-392400.2 16.180