EXIST’s Gamma-Ray Burst Sensitivity
EXIST’s Gamma-Ray Burst Sensitivity
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DOI：
10.1086/524883
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发表时间：
2007-10
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影响因子：
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通讯作者：
D. Band;J. Grindlay;J. Hong;G. Fishman;D. Hartmann;A. Garson III;H. Krawczynski;S. Barthelmy;N. Gehrels;G. Skinner
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文献类型：
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作者：
D. Band;J. Grindlay;J. Hong;G. Fishman;D. Hartmann;A. Garson III;H. Krawczynski;S. Barthelmy;N. Gehrels;G. Skinner
我们使用半分析技术来评估EXIST硬X射线调查使命的设计的突发灵敏度。将这些技术应用到为Beyond Einstein计划提出的使命设计中，我们发现EXIST具有非常大的视场和微弱的伽马射线爆发检测阈值，每天将检测和定位大约两个爆发，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。在阈值处，爆发将被局部化到优于40英寸，对于强爆发，爆发位置与几角秒一样好。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。
We use semianalytic 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″ at threshold, with a burst position as good as a few arcseconds 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.