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The extragalactic VHE gamma-ray sky is rich in blazars. These are jettedactive galactic nuclei viewed at a small angle to the line-of-sight. Only ahandful of objects viewed at a larger angle are known so far to emit above 100GeV. Multi-wavelength studies of such objects up to the highest energiesprovide new insights into the particle and radiation processes of activegalactic nuclei. We report the results from the first multi-wavelength campaignobserving the TeV detected nucleus of the active galaxy IC 310, whose jet isobserved at a moderate viewing angle of 10 deg - 20 deg. The multi-instrumentcampaign was conducted between 2012 Nov. and 2013 Jan., and involvedobservations with MAGIC, Fermi, INTEGRAL, Swift, OVRO, MOJAVE and EVN. Theseobservations were complemented with archival data from the AllWISE and 2MASScatalogs. A one-zone synchrotron self-Compton model was applied to describe thebroad-band spectral energy distribution. IC 310 showed an extraordinary TeVflare at the beginning of the campaign, followed by a low, but still detectableTeV flux. Compared to previous measurements, the spectral shape was found to besteeper during the low emission state. Simultaneous observations in the softX-ray band showed an enhanced energy flux state and a harder-when-brighterspectral shape behaviour. No strong correlated flux variability was found inother frequency regimes. The broad-band spectral energy distribution obtainedfrom these observations supports the hypothesis of a double-hump structure. Theharder-when-brighter trend in the X-ray and VHE emission is consistent with thebehaviour expected from a synchrotron self-Compton scenario. Thecontemporaneous broad-band spectral energy distribution is well described witha one-zone synchrotron self-Compton model using parameters that are comparableto those found for other gamma-ray-emitting misaligned blazars.

First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310