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arXiv 0710.2350astro-ph
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用Milagro搜索卫星探测的伽马射线暴的瞬发甚高能辐射

A Search for Prompt Very High Energy Emission from Satellite-detected Gamma-ray Bursts using Milagro

Milagro Collaboration, P. M. Saz Parkinson, B. L. Dingus

摘要:

伽马射线暴(GRB)已被探测到高达GeV的能量,并被许多模型预测发射在非常高的能量(VHE,> 100 GeV)制度了。探测到这种辐射将使我们能够约束伽玛暴模型。自2004年底发射以来,雨燕卫星一直以每年约100个伽玛暴的速度定位伽玛暴。在许多波长的快速定位和跟踪揭示了新的和意想不到的现象,如明亮的X射线耀斑形式的延迟发射。米拉格罗伽马射线天文台是一个宽视场(2 sr)仪器,采用水切伦科夫探测器,在100 GeV至100 TeV的能量范围内连续($>$ 90%占空比)观测头顶天空。自2000年1月以来,已知有超过100个伽玛暴出现在米拉格罗的视野中,其中包括自斯威夫特发射以来(至2007年5月)的57个伽玛暴。我们讨论的搜索结果,从这些突发的即时发射,以及延迟发射的X射线耀斑中观察到的一些雨燕爆发。

英文摘要:

Gamma-ray bursts (GRBs) have been detected up to GeV energies and are predicted by many models to emit in the very high energy (VHE, > 100 GeV) regime too. Detection of such emission would allow us to constrain GRB models. Since its launch, in late 2004, the Swift satellite has been locating GRBs at a rate of approximately 100 per year. The rapid localization and follow-up in many wavelengths has revealed new and unexpected phenomena, such as delayed emission in the form of bright X-ray flares. The Milagro gamma-ray observatory is a wide field of view (2 sr) instrument employing a water Cherenkov detector to continuously ($>$ 90% duty cycle) observe the overhead sky in the 100 GeV to 100 TeV energy range. Over 100 GRBs are known to have been in the field of view of Milagro since January 2000, including 57 since the launch of Swift (through May 2007). We discuss the results of the searches for prompt emission from these bursts, as well as for delayed emission from the X-ray flares observed in some of the Swift bursts.

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