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arXiv 1111.1326astro-ph.HE
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Fermi和Swift探测到的伽玛暴的甚高能跟踪观测

Very high energy follow-up observations of GRBs detected by Fermi and Swift

Taylor Aune

摘要:

在许多关于伽马射线暴及其余辉的理论模型中,都预言了100 GeV以上的光子辐射。费米伽马射线太空望远镜上的大面积望远镜(LAT)探测到了延迟的高能辐射(在爆发静止坐标系中高达90 GeV),在爆发的早期余辉阶段没有发现高能光谱截止的证据。一个地面望远镜阵列,对费米和雨燕卫星探测到的100 GeV以上的伽马射线敏感。这些观测并没有得出结论性的探测结果,而且从这些观测中获得的极高能(VHE,E>100 GeV)伽马射线通量的上限是迄今为止最受限制的。

英文摘要:

In many theoretical models of gamma-ray bursts (GRBs) and their afterglows, the emission of photons above 100 GeV is predicted. The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope has detected delayed, high-energy emission (up to 90 GeV in the burst rest-frame) from several GRBs and no evidence of a high-energy spectral cutoff during the early afterglow phase of the burst has been found. Presented here are the results of follow-up observations with VERITAS, a ground-based telescope array sensitive to gamma-rays above 100 GeV, of GRBs detected by the Fermi and Swift satellites. These observations have not yielded a conclusive detection and the upper limits on very high energy (VHE, E>100 GeV) gamma-ray flux obtained from these observations are among the most constraining to date.

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