Band 2007 EXIST on GRB sensitivity

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EXIST's Gamma-Ray Burst Sensitivity

Authors: D. L. Band, J. E. Grindlay, J. Hong, G. Fishman, D. H. Hartmann, A. Garson III, H. Krawczynski, S. Barthelmy, N. Gehrels, G. Skinner

(Submitted on 25 Oct 2007)

Abstract: We use semi-analytic techniques to evaluate the burst sensitivity of designs for the EXIST hard X-ray survey mission. Applying these techniques to the mission design proposed for the Beyond Einstein program, we find that with its very large field-of-view and faint gamma-ray burst detection threshold, EXIST will detect and localize approximately two bursts per day, a large fraction of which may be at high redshift. We estimate that EXIST's maximum sensitivity will be ~4 times greater than that of Swift's Burst Alert Telescope. Bursts will be localized to better than 40 arcsec at threshold, with a burst position as good as a few arcsec for strong bursts. EXIST's combination of three different detector systems will provide spectra from 3 keV to more than 10 MeV. Thus, EXIST will enable a major leap in the understanding of bursts, their evolution, environment, and utility as cosmological probes.

Comments:	25 pages, 10 figures, accepted by ApJ
Subjects:	Astrophysics (astro-ph)
Cite as:	arXiv:0710.4602v1 [astro-ph]