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HESS J0632+057 is one of only two unidentified very-high-energy gamma-raysources which appear to be point-like within experimental resolution. It ispossibly associated with the massive Be star MWC 148 and has been suggested toresemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057was observed by VERITAS for 31 hours in 2006, 2008 and 2009. During theseobservations, no significant signal in gamma rays with energies above 1 TeV wasdetected from the direction of HESS J0632+057. A flux upper limit correspondingto 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data.The non-detection by VERITAS excludes with a probability of 99.993% that HESSJ0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observationswith Swift XRT reveal a factor of 1.8+-0.4 higher flux in the 1-10 keV rangethan earlier X-ray observations of HESS J0632+057. The variability in thegamma-ray and X-ray fluxes supports interpretation of the ob ject as agamma-ray emitting binary.

Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057