The millisecond pulsar PSR B1259-63 and the Be star SS2883 are situated in a highly eccentric binary system , with orbital period \sim 3.4 years .
We report on hard X-ray observations obtained with the INTEGRAL satellite close to the 2004 periastron passage .
These are the first imaging observations of this system in the hard X-ray range ( > 20 keV ) and allow the emission of PSR B1259-63 to be separated from that of a nearby unidentified variable source which may have contaminated previous hard X-ray observations of this system .
Using the IBIS/ISGRI instrument we measured a flux of \sim 2–6 mCrab in the 20–200 keV range , with a power law spectrum of photon index \Gamma = 1.3 \pm 0.5 .