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Proceedings Paper

Andromeda: a mission to determine the gamma-ray burst distance scale
Author(s): Fiona A. Harrison; Walter R. Cook; Thomas A. Prince; Steven M. Schindler; Charles J. Hailey; Stephen E. Thorsett
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Paper Abstract

Andromeda is a wide-field, imaging, hard x-ray/soft gamma-ray instrument capable of detecting gamma-ray bursts (GRBs) a factor approximately 20 times fainter than GRO/BATSE. During one-year of a two-year mission, it could determine whether GRBs are Galactic or cosmological in origin by searching for an excess of bursts towards the nearby Andromeda galaxy (M31). As a pointed, imaging instrument with sensitivity in the 10 - 200 keV band significantly better than previous coded-aperture instruments, Andromeda is capable of carrying out important secondary science objectives: for example, studying the soft-gamma- repeater and x-ray transient populations of M31 and the Galactic bulge. Andromeda is a coded aperture gamma-ray telescope consisting of a hexagonal coded mask coupled to an alkali- halide imaging scintillation detector, a flight-proven technology adapted from the balloon- borne Caltech gamma-ray imaging payload (GRIP). The new instrument is optimized for the 10 - 200 keV band and has 1.5 degree angular resolution over a 17 degree FWHM field of view. Andromeda is designed to be a small, low-cost mission, and draws its design largely from existing instrumentation. Andromeda was submitted to the STEDI program, and will also be proposed as a NASA Small Explorer.

Paper Details

Date Published: 1 September 1995
PDF: 12 pages
Proc. SPIE 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI, (1 September 1995); doi: 10.1117/12.218402
Show Author Affiliations
Fiona A. Harrison, California Institute of Technology (United States)
Walter R. Cook, California Institute of Technology (United States)
Thomas A. Prince, California Institute of Technology (United States)
Steven M. Schindler, California Institute of Technology (United States)
Charles J. Hailey, Columbia Univ. (United States)
Stephen E. Thorsett, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 2518:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI
Oswald H. W. Siegmund; John V. Vallerga, Editor(s)

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