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arXiv 0710.4602astro-ph
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EXIST的伽马射线暴灵敏度

EXIST's Gamma-Ray Burst Sensitivity

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

摘要:

我们使用半分析技术来评估EXIST硬X射线调查任务的设计的突发灵敏度。将这些技术应用到为Beyond Einstein计划提出的任务设计中,我们发现EXIST具有非常大的视场和微弱的伽马射线暴检测阈值,每天将检测和定位大约两次爆发,其中很大一部分可能处于高红移。我们估计EXIST的最大灵敏度将是Swift的Burst Alert望远镜的4倍。在阈值时,爆发将被定位到优于40弧秒的位置,对于强爆发,爆发位置与几弧秒一样好。EXIST的三种不同探测器系统的组合将提供从3 keV到10 MeV以上的光谱。因此,EXIST将在理解爆发、它们的演化、环境和作为宇宙学探测器的效用方面实现重大飞跃。

英文摘要:

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.

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