The High Energy Telescopes on EXIST

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The high energy telescopes (HETs) on EXIST will monitor the hard X-ray sky (10-600 keV) with a large field of view (65x154 deg), scanning almost the entire sky in each orbit. The continuous sky coverage with sensitive hard X-ray imaging detectors is essential to increase the possibility of capturing elusive high red-shift GRBs, highly obscured AGNs and interesting transients of various time scales. HETs consist of arrays of coded-aperture telescopes, employing 6m2 of CZT detectors. HETs will provide 0.05 mCrab sensitivity in 10 150 keV band and 0.5 mCrab in 150 keV 600 keV. The fine pixellation (1.2mm) of CZT detectors will allow 5' resolution and 1' localization for 5 sigma source. The technology being developed for HETs will be tested through a balloon borne pathfinder experiment ProtoEXIST. We report the recent progress of CZT detector development.

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