GCN Circular 12729
Subject
GRB 111225A: GRT Optical Observation
Date
2011-12-26T00:16:14Z (12 years ago)
From
Takanori Sakamoto at NASA/GSFC <takanori.sakamoto-1@nasa.gov>
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC),
T. Okajima (GSFC), Y. Urata (NCU)
We observed the field of GRB 111225A detected by Swift
(trigger #510341; Siegel et al., GCN Circ. 12720) with the 14-inch
Goddard Robotic Telescope (GRT) located at the Goddard Geophysical
and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).
A total 20 images of 60 sec (10 images), 180 sec (5 images) and
300 sec (5 images) exposures were taken in the R filter starting
from December 25 03:52:12 (UT) about 94 seconds after the trigger
(50 seconds after the BAT position notice) and stopped on December 25
04:43:53 (UT). We do not detect the optical afterglow both in the
individual images and the stacked image inside the enhanced XRT position
(Evans et al., GCN #12724). The estimated upper limit of the combined
image (total exposure of 3000 sec) is ~18.5 mag using the USNO-B1 catalog.