  A deep observation campaign carried out by the High Energy Stereoscopic
System (H.E.S.S.) on Centaurus A enabled the discovery of gamma rays from the
blazar 1ES 1312-423, two degrees away from the radio galaxy. With a
differential 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 a
spectral index of 2.9 +/- 0.5 (stat) +/- 0.2 (sys), 1ES 1312-423 is one of the
faintest sources ever detected in the very high energy (E>100 GeV)
extragalactic sky. A careful analysis using three and a half years of Fermi-LAT
data 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 1ES
1312-423. Radio, optical, UV and X-ray observations complete the spectral
energy distribution of this blazar, now covering 16 decades in energy. The
emission is successfully fitted with a synchrotron self Compton model for the
non-thermal component, combined with a black-body spectrum for the optical
emission from the host galaxy.
