  We present the results of a multiwavelength observational campaign on the TeV
binary 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 from
December 2011 through January 2012 and show a strong detection in all three
wavebands. During this period VERITAS obtained 24.9 hours of quality selected
livetime data in which LS I +61 303 was detected at a statistical sig-
nificance of 11.9 sigma. These TeV observations show evidence for nightly
variability in the TeV regime at a post-trial significance of 3.6 sigma. The
combination of the simultaneously obtained TeV and X-ray fluxes do not
demonstrate 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 TeV
detection allows the construction of a detailed MeV-TeV spectral energy
distribution from LS I +61 303. This spectrum shows a distinct cutoff in
emission near 4 GeV, with emission seen by the VERITAS observations following a
simple 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 indicate
that there are two distinct populations of accelerated particles producing the
GeV and TeV emission.
