Balloon program for hard-X-ray astronomy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Balloon-Borne Instruments, Crab Nebula, Pulsars, Scintillation Counters, X Ray Astronomy, X Ray Sources, Power Spectra, X Ray Spectra

Scientific paper

The aims and progress of the program of balloon-borne NaI(Tl)-scintillator-array hard-X-ray (20-200-keV) astronomical observations using the payload described by Frontera et al. (1982) are surveyed, and some sample results from the three flights undertaken since 1980 are presented. The observations of the Crab pulsar in October 1980 are characterized in detail, and a power-law spectrum K(E/100) to the -alpha photons/sq cm s keV is derived, with K = 0.000637 + or - 0.000031 and alpha = 2.27 + or - 0.14.

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