Optimizing The Imaging Performance Of The Exist High Energy Telescope

Details Optimizing The Imaging Performance Of The Exist High Energy Telescope Optimizing The Imaging Performance Of The Exist High Energy Telescope

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345308s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #453.08; Bulletin of the American Astronomical Society, Vol. 41, p.349

Computer Science

Performance

1

Scientific paper

The baseline concept for the primary instrument of the EXIST mission, the high energy telescope (HET), is a coded mask instrument with a wide field of view and extremely good sensitivity (Hong et al., this meeting). Achieving the performance goals requires an imaging capability close to the statistical photon limit, minimizing systematic errors even when the total integration time is very long. At the same time there is a requirement to be able to reconstruct images on board in near real time in order to detect and localize gamma-ray bursts. This must be done while the spacecraft is scanning the sky with a motion designed to help reduce systematic errors and to provide all-sky coverage. During the 2008 Advanced Mission Concept Study, the Exist Imaging Technical Working Group has investigated and compared numerous alternative designs for the HET. The selected baseline concept meets all of the scientific requirements, while being compatible with spacecraft and launch constraints and with those imposed by the Infra-Red Telescope that forms the other key part of the mission. The approach adopted depends on a unique annular coded mask with two spatial scales, offering good resolution and low background at low energies, with a lower resolution but enhanced sensitivity in the upper part of the energy band. Monte Carlo simulations and analytic analysis techniques have been used to demonstrate the capabilities of the proposed design.

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