[vsnet-grb-info 18499] GRB 160925A/MASTER optical transient: Mondy optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19947
SUBJECT: GRB 160925A/MASTER optical transient: Mondy optical observations
DATE:    16/09/27 12:34:06 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the field of the Fermi GRB 160925A (trigger #496473540) with 
  AZT-33IK telescope of Sayan observatory (Mondy) starting on Sep., 26 
(UT) 14:38:09. We obtained several images in R-filter. We  clearly 
detected optical transient (Lipunov et al., GCN 19938; Guidorzi et al., 
GCN  19939). Preliminary photometry  of the transient is following

Date        UT start   t-T0      Filter Exp.   OT        UpLim (3 sigma)
                        (mid, days)       (s)
2016-09-26  14:38:09   0.88014    R      30*120 16.06+/-0.03  23.0


Photometry is based on nearby USNO-B1.0 stars

USNO-B1.0 R2
0750-0813972 16.86
0750-0813954 17.70
0750-0813947 17.78