  The multiwavelength observation of the nearby radio galaxy M87 provides a
unique opportunity to study in detail processes occurring in Active Galactic
Nuclei from radio waves to TeV gamma-rays. Here we report the detection of
gamma-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS
atmospheric Cherenkov telescope array and discuss its correlation with the
X-ray emission. The gamma-ray emission is measured to be point-like with an
intrinsic source radius less than 4.5 arcmin. The differential energy spectrum
is fitted well by a power-law function:
dPhi/dE=(7.4+-1.3_{stat}+-1.5_{sys})(E/TeV)^{-2.31+-0.17_{stat}+-0.2_{sys}}
10^{-9}m^{-2}s^{-1}TeV^{-1}. We show strong evidence for a year-scale
correlation between the gamma-ray flux reported by TeV experiments and the
X-ray emission measured by the ASM/RXTE observatory, and discuss the possible
short-time-scale variability. These results imply that the gamma-ray emission
from M87 is more likely associated with the core of the galaxy than with other
bright X-ray features in the jet.
