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Context. Recently, the high-energy (HE, 0.1-100 GeV) $\gamma$-ray emissionfrom the object LMC P3 in the Large Magellanic Cloud (LMC) has been discoveredto be modulated with a 10.3-day period, making it the first extra-galactic$\gamma$-ray binary.  Aims. This work aims at the detection of very-high-energy (VHE, >100 GeV)$\gamma$-ray emission and the search for modulation of the VHE signal with theorbital period of the binary system.  Methods. LMC P3 has been observed with the High Energy Stereoscopic System(H.E.S.S.); the acceptance-corrected exposure time is 100 h. The data set hasbeen folded with the known orbital period of the system in order to test forvariability of the emission. Energy spectra are obtained for the orbit-averageddata set, and for the orbital phase bin around the VHE maximum.  Results. VHE $\gamma$-ray emission is detected with a statisticalsignificance of 6.4 $\sigma$. The data clearly show variability which isphase-locked to the orbital period of the system. Periodicity cannot be deducedfrom the H.E.S.S. data set alone. The orbit-averaged luminosity in the $1-10$TeV energy range is $(1.4 \pm 0.2) \times 10^{35}$ erg/s. A luminosity of $(5\pm 1) \times 10^{35}$ erg/s is reached during 20% of the orbit. HE and VHE$\gamma$-ray emissions are anti-correlated. LMC P3 is the most luminous$\gamma$-ray binary known so far.

Detection of variable VHE gamma-ray emission from the extra-galactic gamma-ray binary LMC P3