GCN Circular 22169
Subject
GRB 171123A: TShAO optical upper limit
Date
2017-11-24T23:05:11Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I.
Reva (Fesenkov Astrophysical Institute), E. Mazaeva (IKI), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 171123A (Evans et al.,
GCN 22148) with Zeiss-1000 1-m telescope of Tien Shan Astronomical
Observatory starting on Nov., 23 (UT) 23:31:56. We took several images
in R-filter. Within enhanced XRT error circle (Goad et al., GCN 22150)
we do not detect any object. Preliminary photometry of the afterglow
is following
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s) (3 sigma)
2017-11-23 23:31:56 0.41294 R 38*120 n/d n/d 22.2
Photometry is based on nearby USNO-B1.0 stars, R2 magnitude.