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GCN Circular 19078

Subject

GRB 160225A: TSHAO optical upper limit

Date

2016-02-25T17:37:58Z (8 years ago)

From

Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

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 19075Not found
 
 
) 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 19077Not found
 
 
). 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