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A deep observation campaign carried out by the High Energy StereoscopicSystem (H.E.S.S.) on Centaurus A enabled the discovery of gamma rays from theblazar 1ES 1312-423, two degrees away from the radio galaxy. With adifferential flux at 1 TeV of (1.9 +/-0.6(stat) +/-0.4(sys)) x 10^{-13} /cm^2/s /TeV corresponding to 0.5% of the Crab nebula differential flux and aspectral index of 2.9 +/- 0.5 (stat) +/- 0.2 (sys), 1ES 1312-423 is one of thefaintest sources ever detected in the very high energy (E>100 GeV)extragalactic sky. A careful analysis using three and a half years of Fermi-LATdata allows the discovery at high energies (E>100 MeV) of a hard spectrum(index of 1.4 +/- 0.4 (stat) +/- 0.2 (sys)) source coincident with 1ES1312-423. Radio, optical, UV and X-ray observations complete the spectralenergy distribution of this blazar, now covering 16 decades in energy. Theemission is successfully fitted with a synchrotron self Compton model for thenon-thermal component, combined with a black-body spectrum for the opticalemission from the host galaxy.

H.E.S.S and Fermi-LAT discovery of gamma rays from the blazar 1ES 1312-423