GRATIS: a hard x-ray telescope with arcminute resolution

Details GRATIS: a hard x-ray telescope with arcminute resolution GRATIS: a hard x-ray telescope with arcminute resolution

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4605h&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #46.05; Bulletin of the American Astronomical Society, Vol. 24, p.1195

Physics

Optics

Scientific paper

The Gamma-Ray Arcminute Telescope Imaging System (GRATIS) is a balloon-borne coded aperture experiment sensitive in the energy range 20 - 200 keV. This is the first experiment in this energy band capable of resolving sources on arcminute scales. The design incorporates an array of thirty-six imaging scintillation detectors coupled to one-dimensional coded masks which collectively yield a two-dimensional map over a field of view of 0.75 degrees. The payload is fully constructed and calibrated and will be launched for the first time this coming Spring. In this poster we present an overview of the conceptual design of the instrument optics and detector system as well as laboratory data demonstrating the imaging performance of the telescope. We also discuss our proposed observing plan and present calculations of our expected sensitivity. A companion paper will discuss the telesope guidance and pointing system.

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