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We present the results of a multiwavelength observational campaign on the TeVbinary system LS I +61 303 with the VERITAS telescope array (>200 GeV),Fermi-LAT (0.3-300 GeV), and Swift-XRT (2-10 keV). The data were taken fromDecember 2011 through January 2012 and show a strong detection in all threewavebands. During this period VERITAS obtained 24.9 hours of quality selectedlivetime data in which LS I +61 303 was detected at a statistical sig-nificance of 11.9 sigma. These TeV observations show evidence for nightlyvariability in the TeV regime at a post-trial significance of 3.6 sigma. Thecombination of the simultaneously obtained TeV and X-ray fluxes do notdemonstrate any evidence for a correlation between emission in the two bands.For the first time since the launch of the Fermi satellite in 2008, this TeVdetection allows the construction of a detailed MeV-TeV spectral energydistribution from LS I +61 303. This spectrum shows a distinct cutoff inemission near 4 GeV, with emission seen by the VERITAS observations following asimple power-law above 200 GeV. This feature in the spectrum of LS I +61 303,obtained from overlapping observations with Fermi-LAT and VERITAS, may indicatethat there are two distinct populations of accelerated particles producing theGeV and TeV emission.

Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst