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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  22082Not found
 
 
) 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 
22084Not found
 
 
) 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