[vsnet-grb-info 18968] GRB 170112A : AbAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20472
SUBJECT: GRB 170112A : AbAO optical observations
DATE:    17/01/16 19:35:42 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), 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 short GRB 170112A (Mingo  et al., GCN 20436) 
with AS-32 (0.7m) telescope of Abastumani Observatory  on Jan., 12 (UT) 
15:35:30. We obtained several unfiltered images of the field. Within BAT 
error circle (Mingo  et al., GCN 2043) we found the source which is 
absent in USNO-B1.0 at coordinates (J2000) 01:00:49.80  -17:10:17.5 with 
uncertainty of 0.9 arcsec in both coordinates.
Finding chart can be found at 
http://grb.rssi.ru/GRB170112A/GRB170112A_AAO_170112.png
The source is  barely visible in DSS2 (R). Preliminary photometry  of 
the source is following

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

2017-01-12  15:35:30   0.61446   CR     47*60  17.50 0.25  17.7

Photometry is based on nearby USNO-B1.0 stars
USNO-B.1_id  R2
0727-0016063 14.46
0728-0016765 15.73
0728-0016759 12.78
0728-0016802 14.33

The source above does not match any source of XRT observation (D'Ai   et 
al., GCN 20440), see also http://www.swift.ac.uk/ToO_GRBs/00732188/