  The High Energy Stereoscopic System (HESS) survey of the Galactic plane has
established the existence of a substantial number (~40) of Galactic TeV
gamma-ray sources, a large fraction of which remain unidentified. HESS
J0632+057 is one of a small fraction of these objects which is point-like in
nature(<2' rms), and is one of only two point-like sources that remain
unidentified. Follow-up observations of this object with XMM-Newton have
revealed an X-ray source coincident with the TeV source and with the massive
star MWC 148, of the spectral type B0pe. This source exhibits a hard spectrum,
consistent with an absorbed power law with Gamma = 1.26 +/- 0.04, and shows
significant variability on hour timescales. We discuss this spatial coincidence
and the implied spectral energy distribution of this object and argue that it
is likely a new gamma-ray binary system with a close resemblance to the three
known members of this class, and in particular to LS I +61 303. Further X-ray,
radio and optical observations of this system are needed to firmly establish
HESS J0632+057 as a new member of this rare class of Galactic objects.
