GCN Circular 12992
Subject
GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
Date
2012-02-27T22:06:54Z (12 years ago)
From
James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W. T. Vestrand, P. Wozniak, and H. Davis
of Los Alamos National Laboratory report:
The RAPTOR wide-field optical monitor located in Maui was observing the
location of GRB 120227A which occured at 09:22:46 UT (Fermi GBM trigger
352027367, INTEGRAL SPI-ACS trigger 6478). Our system covered the entire
6.33 degree radius statistical error region specified in the Fermi-GBM
Final Position GCN notice. The image that was coincident with the trigger
started at 09:22:40.6 UT with an exposure duration of 10 seconds. This
unfiltered image has a 3-sigma limiting magnitude of approximately 10.3
when compared to the Tycho-2 V-band. A visual inspection of this image
when differenced with one taken 17 minutes later does not show any candidate
optical counterparts within the specified error region.