[vsnet-grb-info 20006] GRB 171102B: AbAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22093
SUBJECT: GRB 171102B: AbAO optical upper limit
DATE:    17/11/03 20:51:02 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at 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  22082) 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   22084) 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