A. Bouvier (SLAC), D. Band (GSFC), J. Bregeon (INFN Pisa), J. Chiang
(SLAC), S. Cutini (ASDC), B. Dingus (LANL), N. Gehrels (GSFC), Y.
Fukazawa (Hiroshima U), M. Hayashida (SLAC), F. Longo (INFN Trieste),
J. McEnery (GSFC), M. Ohno (JAXA), N. Omodei (INFN Pisa), V. Pelassa
(LPTA), F. Piron (LPTA), D. Sanchez (LLR), J. Scargle (NASA Ames), H.
Tajima (SLAC), T. Tanaka (SLAC), G. Thayer (SLAC) on behalf of the
Fermi LAT team:
We report a detection by the Fermi Large Area Telescope (LAT) of
emission from GRB080825C, which was triggered by the Fermi Gamma-ray
Burst Monitor (GBM) at 14:13:48 UT on August 25th 2008 (GCN 8141 by
Van der Horst et al.). The angle of the GBM best localization (ra,
dec=232.2,-4.6) with the LAT boresight was 60 deg at the time of the
trigger which is on the edge of our field of view.
The data from the Fermi LAT shows a significant increase in the event
rate within 10 degree of the GBM localization and up to 35 seconds
after the GBM trigger that is spatially and temporally correlated
with the GBM emission with a significance of more than 5 sigma. All
the LAT events detected during the GBM emission have energies below 1
The best LAT on-ground localization is found to be
RA,DEC=233.96,-4.72 deg with a 90% containment radius of 1.5 deg
(statistical+systematics; 68% containment radius: 0.95 deg) which is
consistent with the GBM localization.
This circular is an official product of the Fermi LAT team.