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The very high energy (VHE) \gamma-ray source HESS J0632+057 has recently beenconfirmed to be a \gamma-ray binary. The optical counterpart is the Be star MWC148, and a compact object of unknown nature orbits it every ~321 d with a higheccentricity of ~0.8. We monitored HESS J0632+057 with the stereoscopic MAGICtelescopes from 2010 October to 2011 March and detected significant VHE\gamma-ray emission during 2011 February, when the system exhibited an X-rayoutburst. We find no \gamma-ray signal in the other observation periods whenthe system did not show increased X-ray flux. Thus HESS J0632+057 exhibits\gamma-ray variability on timescales of the order of one to two months possiblylinked to the X-ray outburst that takes place about 100 days after theperiastron passage. Furthermore our measurements provide for the first time the\gamma-ray spectrum down to about 140 GeV and indicate no turnover of thespectrum at low energies. We compare the properties of HESS J0632+057 with thesimilar \gamma-ray binary LS I +61 303, and discuss on the possible origin ofthe multi-wavelength emission of the source

Detection of VHE \gamma-rays from HESS J0632+057 during the 2011 February X-ray outburst with the MAGIC Telescopes