[vsnet-grb-info 17574] GRB 160131A: TSHAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19004
SUBJECT: GRB 160131A: TSHAO optical observations
DATE:    16/02/08 22:04:39 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the Swift GRB 160131A (Page et al., GCN 18951) with 
Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. 
We obtained several images in R filter on Feb. 06 and Feb. 07.The 
optical afterglow (Page et al., GCN 18951; Yurkov et al., GCN 18952; 
Guidorzi et al., GCN 18953; Xin et al., GCN 18954; Xin et al., GCN 
18955; Watson et al., GCN 18956) is detected on Feb. 06 and not detected 
on Feb. 07.  Preliminary photometry is following


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


2016-02-06 13:45:54   6.26762 R       21*300 22.40   0.3
2016-02-07 13:30:04   7.25330 R       21*300 >22.40 (3sigma)


Photometry is based on nearby USNO-B1.0 stars

USNO-B.1_id  R2

0829-0078223 15.70
0829-0078147 14.56
0829-0078167 17.71
0829-0078222 18.96
0829-0078226 18.69
0829-0078129 17.62