[vsnet-grb-info 18712] GRB 161108A: TSHAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20160
SUBJECT: GRB 161108A: TSHAO optical observations
DATE:    16/11/09 21:29:59 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the field of GRB 161108A  (Beardmore et al., GCN 20145) 
with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical 
Observatory. We obtained several images in R filter starting on Nov. 08 
(UT) 23:06:16. Within enhanced XRT position (Beardmore et al., GCN 
20147) we detected a source coinciding with the afterglow of GRB 161014A 
(Malesani et al., GCN 20146; Butler et al., GCN 20149). Preliminary 
photometry of the source is following

Date       UT start   t-T0   Filter   Exp.   OT   Err.  UL
                       (mid, days)     (s)
2016-11-08 23:06:16   0.83869  R      28*120 21.8 0.20  22.0

Our photometry of the afterglow might be  affected by nearby galaxy 
mentioned in GCN 20149 (Malesani et al.)

Photometry is based on nearby SDSS-DR9 stars (Lupton transformations):
SDSS-DR9_id         R(Lupton)
J120315.88+245217.4 18.37
J120326.17+245228.7 18.71
J120318.05+245356.7 18.52
J120250.21+245354.3 18.35
J120258.81+245024.2 16.90
J120314.67+244944.0 17.06
J120321.43+244829.2 16.79