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Discovery of Very High Energy gamma-rays from the blazar S5 0716+714

The MAGIC collaboration reports the detection of the blazar S5 0716+714 (z=0.31+-0.08) in very high energy gamma-rays. The observations were performed in November 2007 and in April 2008, and were triggered by the KVA telescope due to the high optical state of the object. An overall significance of the signal accounts to S =5.8 sigma for 13.1 hours of data. Most of the signal comes from the April 2008 data sample during a higher optical state of the object suggesting a possible correlation between the VHE gamma-ray and optical emissions. The differential energy spectrum of the 2008 data sample follows a power law with a photon index of Gamma = 3.45+-0.54_(stat)+-0.2_(sys), and the integral flux above 400 GeV is at the level of (7.5+-2.2_(stat)+-2.3_(sys))* 10^-12 cm^-2 s^-1. Modeling of the broad band spectral energy distribution indicates that a simple one zone synchrotron self-Compton model cannot describe the available data well whereas the structured jet model can.

gamma-rays:Observations; BL Lacs:individual:S5 0716+714

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