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GCN Circular 16422

Subject

GRB 140610A: TShAO optical upper limit

Date

2014-06-20T09:37:19Z (10 years ago)

From

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

A. Volnova (IKI), W. Mundrzyjewski (Fesenkov Astrophysical Institute), 
A. Kusakin (Fesenkov Astrophysical Institute), A. Pozanenko (IKI) report 
on behalf of larger GRB follow-up collaboration:

We observed the field of the Swift GRB 140610A (Evans  et al., GCN 
16375Not found
 
 
) with Zeiss-1000 (East) telescope of Tien Shan Astronomical 
Observatory starting on June 10, (UT) 16:49:37, i.e. 18 minutes after 
GRB trigger. We took several images in R-filter. Within enhanced XRT 
position (Evans et al., GCN 16388Not found
 
 
) we do not find any new source neither 
in the first image nor in a stacked image.

Details of the photometry are following:

date        UT start   t-T0       Filter  Exp.   UL(3 sigma)
                       (mid, days)          (s)
2014-06-10  16:49:37  0.04487     R       56*60  19.9

The photometry is based on USNO-B1.0 star
USNO-B1.0    RA           Dec        R2
0939-0410021 19:05:04.48 +03:54:23.3 16.75