  Very-high energy (VHE) emission has been detected from PKS 0447-439 with the
H.E.S.S. Cherenkov telescope array. This blazar is one of the brightest
hard-spectrum extragalactic objects in the Fermi bright source list. Its
detection with H.E.S.S. triggered Target of Opportunity observations with the
Swift and RXTE telescopes, which show rapid flaring in the X-ray band. The
spectrum and light curve measured by H.E.S.S. are presented. Along with the
Fermi LAT data it is possible to put an upper limit on the redshift of the
source. Implications of the flux evolution are discussed briefly.
