GCN Circular 28856
Subject
GRB 201104B: Kitab optical observations
Event
Date
2020-11-06T17:01:34Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Zhornichenko (KIAM), A. Pozanenko (IKI), V.
Agletdinov (KIAM), Sh. Ehgamberdiev (UBAI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 201104B (Sbarufatti et al., GCN 28825)
with Kitab-ISON RC-36 telescope in Clear filter. Observation started
on Nov. 4 (UT) 18:44:28, i.e. 77 minutes after trigger.
The optical afterglow (Marshall et al., GCN 28827; Vielfaure et al.,
GCN 28840; Oates et al., GCN 28851) at redshift z = 1.954 (Vielfaure et
al., GCN 28840) is marginally (S/N = 1.8) detected in stacked image.
Preliminary photometry of the afterglow is following.
Date, UT start, t-T0, Exp., Filter, OT, S/N UL(3 sigma)
(mid, days)
2020-11-04 18:44:28 0.0741 72*60 CR 20.4 1.8 20.0
The photometry is based on nearby USNO-B1.0 stars, R magnitude.
USNO-B1.0_id R2
0979-0003163 17.51
0979-0003223 17.47