[vsnet-grb-info 18765] GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20215
SUBJECT: GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy
DATE:    16/11/29 16:41:01 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin 
(Fesenkov Astrophysical Institute),  A. Volnova (IKI), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of 161129A  (Kocevski et al., GCN 20210)  with 
Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. 
We obtained several images in R filter starting on 2016-11-29 (UT) 
12:51:12.  Within enhanced XRT position (Beardmore et al. GCN 20211)  we 
detected  optical source which is absent in USNO-B1.0 but barely visible 
in DSS2 (red). At the moment we can not say anything about the source 
variability. The source might be a superposition of the afterglow and a 
host galaxy.  Preliminary photometry of the source  is following

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

2016-11-29 12:51:12 0.25949  R       13*300 20.60  0.06  22.4

Photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id    R2
1221-0612083 17.30
1221-0612140 19.02