The high-mass X-ray binary system LS I +61 303 is well known as a rare example of a variable Galactic GeV and TeV gamma-ray emitter. Despite years of study, many aspects of the system remain unclear; the nature of the compact object, the particle acceleration mechanisms and the gamma-ray emission and absorption processes can all be modelled in a variety of different scenarios. Here we report on a deep exposure of LS I +61 303 made with the VERITAS array during the 2008-2009 observing season. These are the first TeV observations made with contemporaneous coverage at lower energies by the LAT onboard Fermi, and as such provide a new set of constraints for system models.
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- VERITAS Observations of LS I +61 303 in the Fermi Era