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GCN Circular 22093

Subject

GRB 171102B: AbAO optical upper limit

Date

2017-11-03T20:51:02Z (7 years ago)

From

Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

E. Mazaeva (IKI),  R. Inasaridze (AbAO), A. Pozanenko (IKI),   A. 
Volnova  (IKI),   V. Ayvazian (AbAO),  O. Kvaratskhelia (AbAO), G. 
Inasaridze (AbAO), I. Molotov (KIAM) 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 AS-32 (0.7m) telescope of Abastumani Observatory 
starting on Nov., 02 (UT) 15:53:26. We obtained several unfiltered 
images of the field.   Within enhanced XRT error circle  (Osborne et 
al., GCN   22084Not found
 
 
) we do not detect  any  object.  Preliminary photometry 
of the field is following

Date        UT start  t-T0     Filter Exp.   OT   Err UpLim (3 sigma)
                       (mid, days)     (s)

2017-11-02 15:53:26   0.05497  CR     53*60  n/d  n/d 21.7

Photometry is based on nearby USNO-B1.0 stars R2 magnitudes
USNO-B.1_id  R2
1124-0422571 18.10
1124-0422577 17.52
1124-0422572 18.34
1124-0422730 17.80

A finding chart can be found at 
http://grb.rssi.ru/GRB171102B/GRB171102B_AAO_171102.png