[vsnet-grb-info 15130] GRB 140610A: TShAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16422
SUBJECT: GRB 140610A: TShAO optical upper limit
DATE:    14/06/20 09:37:19 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at 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 
16375) 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 16388) 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