Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 19947

GRB 160925A/MASTER optical transient: Mondy optical observations
2016-09-27T12:34:06Z (8 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova 
(IKI), I. Korobtsev (ISTP)  report on behalf of larger GRB follow-up 

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
Looking for U.S. government information and services? Visit