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 19078

GRB 160225A: TSHAO optical upper limit
2016-02-25T17:37:58Z (8 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI),  A. Kusakin (Fesenkov Astrophysical Institute), I. 
Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI),  A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the Swift GRB 160225A (Siegel  et al., GCN 19075) with 
Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical Observatory. 
We obtained several images in R filter starting on  Feb. 25 (UT) 
14:46:05. In the first images we do not detect any optical source within 
enhanced Swift-XRT position (Goad et al., GCN 19077). Preliminary 
photometry of one of  single 90 s image is following

Date        UT start   t-T0    Filter  Exp.   UL (3sigma)
                       (mid, days)     (s)

2016-02-25 14:47:35   0.01903  R      1*90    18.90
Looking for U.S. government information and services? Visit