[vsnet-grb-info 15440] GRB 140817A: Khureltogot optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16729
SUBJECT: GRB 140817A:  Khureltogot optical upper limit
DATE:    14/08/20 17:29:16 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Pozanenko (IKI),  N. Tungalag (Research Center of Astronomy and 
Geophysics MAS),  S. Schmalz (AIP), A. Volnova (IKI), I.Molotov (KIAM) 
report on behalf of larger GRB follow-up collaboration:

We observed the  field of GRB 140817A (Sbarufatti et al., GCN 16695) 
with ORI-40 telescope of Khureltogot observatory.  We started 
observation on Aug. 17 (UT) 14:20:48 and obtained 60 unfiltered images 
of 60 s exposure. Within enhanced XRT error circle  (Osborne et al., GCN 
16697) we do not detect any new object and in particular the afterglow 
candidate (Marshall et al., GCN 16710). Details of a photometry of the 
stacked image is following

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

2014-08-17 14:20:48  0.3269   None    60*60   18.2

The photometry is based on USNO-B1.0 star 1481-0233222 assuming 
R=15.43.