Hard X-ray telescope HAPI-1 and its observation of Crab pulsar

Astronomy and Astrophysics – Astronomy

Scientific paper

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Functional Design Specifications, X Ray Astronomy, X Ray Telescopes, Balloon-Borne Instruments, Pulsars

Scientific paper

A hard X-ray phoswich telescope, HAPI-1, is described that was designed to make observations of high flying balloons. The telescope is comprised of a 145 cm primary crystal of 5 mm thick CsI (T1) actively shielded over the lower 2 steradians by a 5 cm thick NaI (T1) crystal and has a field of view of approximately 4 deg HWHM determined by a graded shield and collimator. The scintillation pulses originating in CsI and NaI crystals are distinguished by pulse shape discrimination. All sub-systems of the telescope are described. The Crab pulsar was observed by HAPI-1 during a balloon flight on 23 May 1984, in the energy range of 20 to 200 KeV, and the observation results are presented.

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