[vsnet-grb-info 17560] GRB 160203A: TSHAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18990
SUBJECT: GRB 160203A: TSHAO optical observations
DATE:    16/02/05 13:54:34 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the field of the Swift GRB 160203A (D'Avanzo et al., GCN 
18979) with Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical 
Observatory starting on Feb. 03 (UT) 20:31:45.  We obtained several 
images in R filter. We marginally (S/N ~ 2) detect afterglow  (Kruehler 
et al., GCN 18980) in a combined image. Preliminary photometry of the 
afterglow is following

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

2016-02-03 20:31:45    0.80045  R       21*300 23.0   0.5


The photometry is based on nearby USNO-B1.0 stars:

USNO-B1.0_id   R2
0652-0250834   18.04
0651-0249689   18.51