GCN Circular 12044
Subject
LAT Observations of GRB110529A
Date
2011-05-29T21:31:17Z (14 years ago)
From
Julie McEnery at NASA/GSFC <julie.e.mcenery@nasa.gov>
Julie McEnery (NASA/GSFC), Johan Bregeon (INFN Pisa) and
Dan Kocevski (SLAC) report on behalf of the Fermi-LAT collaboration.
The Fermi Large Area Telescope (LAT) detected emission from GRB
110529A also detected by GBM (trigger 328322924) at 00:48:42.87 UT
on May 29, 2011.
The GBM location was inside the LAT field of view at an angle of
~30 degrees to the LAT boresight; no significant excess is seen
using standard analysis procedures.
Using a non-standard data selection, over 30 counts above background
were detected within a 0.1 s interval coinciding with the time of the
GBM emission. This data selection has insufficient spatial resolution
to provide a reliable LAT localization.
Since an excess of events were not seen using the standard analysis
selection, this detection is likely due to low energy gamma-rays
(below 100 MeV).
Further analysis is ongoing.