TITLE:   GCN CIRCULAR
NUMBER:  18971
SUBJECT: GRB 160131A: Mondy optical observations
DATE:    16/02/01 19:53:38 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev 
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up 
collaboration:

We observed the Swift GRB 160131A (Page et al., GCN 18951) with AZT-33IK 
telescope of Sayan observatory (Mondy)  starting on Feb.01 (UT) 
13:01:56. We clearly detect 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). Preliminary 
photometry of the afterglow of the first image is following


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


2016-02-01  13:01:56  1.19543  R        1*120  19.40  0.08