GCN Circular 22092
Subject
GRB 171102B: TShAO optical upper limit
Date
2017-11-03T20:49:21Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), A.
Pozanenko (IKI), I. Reva (Fesenkov Astrophysical Institute), A.
Volnova (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 170822A (Ukwatta et al.,
GCN 22082) with Zeiss-1000 1-m telescope of Tien Shan Astronomical
Observatory starting on Nov., 02 (UT) 15:47:45. We took several images
in R-filter. Within enhanced XRT error circle (Osborne et al., GCN
22084) 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)
2017-11-02 15:47:45 0.04377 R 30*120 n/d n/d 20.1
Photometry is based on nearby USNO-B1.0 stars R2 magnitudes
USNO-B.1_id R2
1124-0422739 16.70
1124-0422527 16.20
1124-0422440 15.76