TITLE:   GCN CIRCULAR
NUMBER:  14861
SUBJECT: GRB 130608A: ISON-Kislovodsk optical upper limit
DATE:    13/06/10 20:01:43 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Volnova (IKI), V. Linkov (ISON), M.Suvorov (ISON), V. Nevskiy (ISON), 
D. Ivanov (ISON),  I. Molotov (KIAM), A. Pozanenko (IKI),  report on 
behalf of larger collaboration:

We observed the field of  GRB 130608A (Krimm  et al., GCN 14827) with
SANTEL-400AN (0.4-m f/3)  telescope of ISON-Kislovodsk observatory.
Observations started on  Jun. 09 (UT) 00:01:42.   We obtained  several
unfiltered images  of 60 s exposure. We do not detect any source within 
enhanced XRT error circle (Beardmore et al., GCN 14832). Preliminary 
photometry of combined image is based on USNO-B1.0 (R2) nearby  stars:

T_start,             T0+,      Exp,   Filter,  UL (3 sigma)
(UT)                 mid (d)   (s)

2013-06-09T00:01:42  0.04170   960    none     >18.1