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arXiv 1801.01550astro-ph.HE
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用HAWC全天搜索甚高能γ射线暴

An All-Sky Search for Bursts of Very High Energy Gamma Rays with HAWC

Joshua Wood

摘要:

一个新的地面宽场广泛的空气簇射阵列被称为高海拔水切伦科夫(HAWC)天文台承诺一个新的窗口,监测$\sim$ 100 GeV的伽马射线天空的潜力,检测高能量的频谱截止伽马射线暴(GRB)。它的灵敏度比上一代宽视场伽马射线空气簇射仪器提高了大约15倍,并且能够在每天的凌日中探测到高度显著的蟹状星云($>$ 5 $σ$)。它的宽视场($\sim$ 2 sr)和$>$ 95%的反射率使它成为探测$\sim$ 100 GeV的GRB发射的理想仪器,根据现有的GRB发射测量,预计每年观测$\sim$ 1 GRB。本文发展了一种全天空、自触发的伽玛暴VHE辐射HAWC搜索方法。我们提出了三个特征伽玛射线暴发射时间尺度,0.2秒,1秒和10秒,在第一年的完全填充HAWC探测器,这是迄今为止最敏感的数据集的搜索结果。没有发现明显的检测,使我们能够把上限的伽玛射线暴含有可观的发射率在$\sim$ 100 GeV带。这些约束排除了先前未检查的参数空间。

英文摘要:

A new ground-based wide-field extensive air shower array known as the High-Altitude Water Cherenkov (HAWC) Observatory promises a new window to monitoring the $\sim$100 GeV gamma-ray sky with the potential for detecting a high energy spectral cutoff in gamma-ray bursts (GRBs). It represents a roughly 15 times sensitivity gain over the previous generation of wide-field gamma-ray air shower instruments and is able to detect the Crab Nebula at high significance ($>$5 $σ$) with each daily transit. Its wide field-of-view ($\sim$2 sr) and $>$95% uptime make it an ideal instrument for detecting GRB emission at $\sim$100 GeV with an expectation for observing $\sim$1 GRB per year based on existing measurements of GRB emission. An all-sky, self-triggered search for VHE emission produced by GRBs with HAWC has been developed. We present the results of this search on three characteristic GRB emission timescales, 0.2 seconds, 1 second, and 10 seconds, in the first year of the fully-populated HAWC detector which is the most sensitive dataset to date. No significant detections were found, allowing us to place upper limits on the rate of GRBs containing appreciable emission in the $\sim$100 GeV band. These constraints exclude previously unexamined parameter space.

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