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We report on the detection with the MAGIC telescopes of very high energygamma-rays from IC 310, a head-tail radio galaxy in the Perseus galaxy cluster,observed during the interval November 2008 to February 2010. The Fermisatellite has also detected this galaxy. The source is detected by MAGIC at ahigh statistical significance of 7.6sigma in 20.6 hr of stereo data. Theobserved spectral energy distribution is flat with a differential spectralindex of -2.00 \pm 0.14. The mean flux above 300 GeV, between October 2009 andFebruary 2010, (3.1 \pm 0.5)x10^{-12} cm^{-2} s^{-1}, corresponds to (2.5 \pm0.4)% of Crab Nebula units. Only an upper limit, of 1.9% of Crab Nebula unitsabove 300 GeV, was obtained with the 2008 data. This, together with stronghints (>3sigma) of flares in the middle of October and November 2009, impliesthat the emission is variable. The MAGIC results favour a scenario with thevery high energy emission originating from the inner jet close to the centralengine. More complicated models than a simple one-zone SSC scenario, e.g.multi-zone SSC, external Compton or hadronic, may be required to explain thevery flat spectrum and its extension over more than three orders of magnitudein energy.

Detection of very high energy gamma-ray emission from the Perseus cluster head-tail galaxy IC 310 by the MAGIC telescopes