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The \psr system containing a young pulsar and a Be star was observed near periastron by the Compton Gamma-Ray Observatory in January 1994. We report here the detection by the \osse instrument of hard X-ray emission between 50 and 200~keV in the direction of the \psr system. Possible background sources of emission (diffuse galactic background and nearby X-ray binaries) are unlikely to contribute significantly to the detected emission. The emission detected by \osse is consistent with a power-law extrapolation of the X-ray emission detected by \asca from the \psr system. The detection by \osse of the \psr system near periastron is in agreement with shock-powered emission from a pulsar wind termination shock, and it can be used to set important constraints on the shock acceleration mechanism.
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