标题： 包括弥散背景光吸收在内的费米和魔法望远镜伽马射线暴观测的建模 显示英文标题

标题： Modeling gamma-ray burst observations by Fermi and MAGIC including attenuation due to diffuse background light

摘要： 来自河外源的伽马射线会因与弥漫河外背景光（EBL）光子的电子对产生相互作用而被衰减。 伽马射线暴（GRBs）是10 GeV以上高红移光子的来源，因此可用作探测随时间演化的紫外背景辐射的探针。 本文中，我们开发了一个简单的经验模型，用于描述在Fermi卫星和MAGIC大气切伦科夫望远镜上以GeV能量观测到的伽马射线暴的数量和红移分布。 我们估计每年观测到的伽马射线数量，并展示当考虑与不同实现形式的演化EBL相互作用时，该结果如何变化。 我们还讨论了在这种模型下亮的Fermi GRB 080916C的情况。 我们发现，Fermi上的LAT每年可以预期从遥远的伽马射线暴中观测到少量超过10 GeV的光子。 地面仪器如MAGIC的年度结果由于望远镜的低占空比和天空覆盖范围而高度可变。 然而，成功地从地面观测到一个明亮或中等亮度的伽马射线暴可能会提供数百个高红移光子，这几乎肯定会非常有用，用于限制伽马射线暴物理以及高红移EBL。 显示英文摘要

摘要： Gamma rays from extragalactic sources are attenuated by pair-production interactions with diffuse photons of the extragalactic background light (EBL). Gamma-ray bursts (GRBs) are a source of high-redshift photons above 10 GeV, and could be therefore useful as a probe of the evolving UV background radiation. In this paper, we develop a simple phenomenological model for the number and redshift distribution of gamma-ray bursts that can be seen at GeV energies with the Fermi satellite and MAGIC atmospheric Cherenkov telescope. We estimate the observed number of gamma rays per year, and show how this result is modified by considering interactions with different realizations of the evolving EBL. We also discuss the bright Fermi GRB 080916C in the context of this model. We find that the LAT on Fermi can be expected to see a small number of photons above 10 GeV each year from distant GRBs. Annual results for ground-based instruments like MAGIC are highly variable due to the low duty cycle and sky coverage of the telescope. However, successfully viewing a bright or intermediate GRB from the ground could provide hundreds of photons from high redshift, which would almost certainly be extremely useful in constraining both GRB physics and the high-redshift EBL.