The high pressure gas scintillation proportional counter, HPGSPC, was launched on April 30, 1996, as part of the narrow field instruments package of the satellite for x-ray astronomy BeppoSAX. Sensitive in the 4 - 100 keV band it fills the gap between the LECS, MECS and PDS instruments, making BeppoSAX a real wide band satellite. In the following paper we present performance and calibration results on in-flight energy response, spectral and timing capabilities, in-orbit background.
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