GCN Circular 19936
Subject
GRB 160917A: Mondy afterglow confirmation
Event
Date
2016-09-19T20:12:31Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva
(IKI), I. Korobtsev (ISTP) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the GRB 160917A (Racusin et al. GCN 19926) with
AZT-33IK telescope of Sayan observatory (Mondy) starting on Sep., 18
(UT) 15:25:21. We obtained several images in R-filter. We do not detect
the optical source reported as afterglow candidate (Volnova et al. GCN
19929; Kuin et al. GCN 19931). Preliminary photometry of the field is
following
Date UT start t-T0 Filter Exp. OT UL (3 sigma)
(mid, days) (s)
2016-09-18 15:25:21 1.18522 R 60*60 n/d 22.0
Photometry is based on nearby USNO-B1.0 stars used in GCN circ. 19929.
In comparison with our previous observation (Volnova et al. GCN 19929)
the source is not visible up to 22.0 mag. The source faded between two
epochs on at least 1.4 magnitudes and it is most probably the afterglow
of GRB 160917A. Our observation is compatible with more deep RATIR
observation in r-filter (Butler et al. GCN 19933).