GCN Circular 32684
Subject
GRB 221009A: Sintez-Newton/CrAO optical observations
Event
Date
2022-10-11T13:01:20Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI, HSE), S. Nazarov (CrAO), A. Pozanenko (IKI), N. Pankov
(HSE) report on behalf of IKI GRB FuN:
We observed GRB 221009A/Swift J1913.1+1946 (Dichiara et al., GCN 32632;
Kennea and Williams, GCN 32635; Veres et al., GCN 32636; Bissaldi et
al., GCN 32636; Svinkin et al., GCN 32641; Piano et al., GCN 32657;
Pillera et al., GCN 32658; Gotz et al., GCN 32660; Frederiks et al.,
GCN 32668) with Sintez-Newton 350mm f/5 telescope equipped with QHY600M
camera and g'r'i'z' filters. Observation started on 2022-10-10 (UT)
17:24:54. The series consists of images with an exposure of 120 s in
r'-filter.
In the stacked image we clearly detect the optical afterglow (e.g.
Dichiara et al., GCN 32632; Lipunov et al., GCN 32634; Perley GCN 32638;
Hu et al., GCN 32644; Belkin et al., GCN 32645; Kuin et al., GCN 32656;
Kim et al., GCN 32670). Preliminary photometry of the afterglow is following
Preliminary photometry of the stacked images is following
Date UT start t-T0 Filter Exp. OT err UL(3)
(mid, days) (s)
2022-10-10 17:24:54 1.16293 r' 40*120 18.43 0.10 20.9
The photometry is based on nearby PS1 stars