In-flight performances of grazing incidence x-ray optics on board the x-ray astronomy satellite BeppoSAX

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Abstract
The scientific instrumentation on board the x-ray astronomy satellite BeppoSAX, launched at the end of April 1996, includes four identical mirror units, each composed of 30 nested grazing incidence mirrors. The focal plane detectors are 3 identical position sensitive medium energy gas scintillation proportional counters, operating in the energy range 1.3 - 10 keV and 1 low energy gas scintillation proportional counter in the range 0.1 - 10 keV. During the science verification phase (July-November 96) a selected number of x-ray targets has been observed in order to have an in-flight calibration of the instrument. This paper describes some results with particular emphasis to the on axis and off axis behavior of the optical systems.

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