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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2198
DTSTART:20111026T193000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T231858Z
LAST-MODIFIED:20111006T164505Z
LOCATION:4274 Chamberlin Hall
SUMMARY:GRB Observations with Fermi Large Area Telescope\, NPAC (Nucle
 ar/Particle/Astro/Cosmo) Forum\, Vlasios Vasileiou\, LUPM\, Universite
  de Montpellier\, Montpellier\, France
DESCRIPTION:During its first three years of operations\, since August 
 2008\, the Large Area Telescope on board the Fermi spacecraft (Fermi-L
 AT) has detected more than 30 GRBs in the ~30 MeV - 300 GeV energy ran
 ge\, and has set upper limits on the E>100 MeV emission on hundreds of
  GRBs occurring in its field of view. These results revealed new and p
 uzzling features in the temporal and spectral behavior of GRBs\, such 
 as a delayed onset of the high-energy (E>100 MeV) emission with respec
 t to the lower-energy (keV/MeV) signal detected by the Gamma-Ray Burst
  Monitor (Fermi-GBM)\, the presence of an extra spectral component in 
 addition to the Band function\, an extended emission lasting significa
 ntly longer than the lower-energy keV/MeV prompt emission\, and the pr
 esence of spectral cutoffs at tens-of-MeV energies. We will present th
 ese discoveries and their theoretical implications\, focusing both on 
 individual cases and also in the context of a systematic and unbiased 
 study performed towards the first Fermi-LAT GRB catalog. In addition\,
  constraints on any energy dependence of the speed of light placed wit
 h GRB observations will be presented.
URL:https://www.physics.wisc.edu/events/?id=2198
END:VEVENT
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