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GCN Circular 18193

Subject

GRB 150819A: Mondy and TSHAO optical upper limits

Date

2015-08-21T23:11:50Z (9 years ago)

From

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

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

We observed the field of the Swift GRB 150819A (Ukwatta  et al., GCN 
18163Not found
 
 
) with AZT-33IK telescope of Sayan observatory (Mondy) and 
Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical Observatory. 
We obtained several images in R-filter in each telescope. We do not 
detect any source within enhanced XRT error circle (Evans et al., GCN 
18167Not found
 
 
).
Upper limits of the field are  following

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

2015-08-19 19:06:09   0.78197  R        30*120  22.7         AZT-33IK
2015-08-19 21:57:51   0.89889  R        10*300  19.4         Zeiss-1000

Photometry is based on USNO-B1.0 stars:
USNO-B.1_id    R2
0997-0042082 17.56
0997-0042080 18.70