Gamma-ray variability and correlation properties of blazars observed   with Fermi LAT
  The Fermi Large Area Telescope (Fermi LAT) provides long term systematic monitoring observations of the gamma-ray emission from blazars. The variability properties and the correlation with other wavelength bands are important clues for the evaluation of blazar models. We present results from timing and multiwavelength correlation analysis and discuss differences between blazar classes. 
Stefan Larsson (for the Fermi LAT collaboration)
astro-ph.HE astro-ph.CO