J. L. Racusin (NASA/GSFC), S. Zhu (NASA/GSFC/UMD), D. Kocevski (NASA/GSFC/ORAU), M. Ohno (Hiroshima),
N. Omodei (Stanford), E. Troja (NASA/GSFC/CRESST) and G. Vianello (Stanford), report on behalf of the Fermi LAT
At 20:41:55.76 UTC on November 8, 2013, Fermi LAT triggered onboard on high energy emission from GRB 131108A.
The burst was also detected by GBM (trigger 131108863/405636118), and triggered an autonomous repoint of the
spacecraft. This is the first onboard trigger since 2009, indicating a potentially rare and exciting event.
The onboard location is R.A., Dec. 156.47, +9.90 (J2000) with an approximate error radius of 0.5 deg, seeded by the
GBM detected position. This was 27 deg from the LAT boresight at the time of the trigger. We anticipate providing a
refined location within the next 12-15 hours when the LAT science data for this burst is downlinked and processed.
The Fermi LAT point of contact for this burst is Masanori Ohno (email@example.com).
A Swift TOO request has been approved.
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300
GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific
institutions across France, Italy, Japan and Sweden.