[vsnet-grb-info 10791] INTEGRAL Weak trigger #6331: GRT Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12213
SUBJECT: INTEGRAL Weak trigger #6331: GRT Optical Observation
DATE:    11/07/30 05:05:52 GMT
FROM:    Takanori Sakamoto at NASA/GSFC  <takanori.sakamoto-1 at nasa.gov>

T. Sakamoto (UMBC/GSFC), D. Donato (UMD/GSFC), N. Gehrels (GSFC),
T. Okajima (GSFC), Y. Urata (NCU)

We observed the field of INTEGRAL Weak trigger #6331 with the
14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical
and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).

A total 204 good quality images of 5 sec (146 images), 30 sec (31 images) 
and 60 sec (27 images) exposures were taken in the R filter starting from
July 27 04:05:04 (UT), about 102 seconds after the trigger (92 seconds after
the notice), and stopped on July 27 06:57:47 (UT).  We do not detect the 
optical afterglow both in the individual images and the stacked image inside
the 3.63 arcmin error circle.  The estimated five sigma upper limit of the 
combined image (total exposure of 3280 sec) is ~19.8 mag using the USNO-B1 
catalog.