Milagro is a water-Cherenkov detector capable of observing air showers produced by gamma rays with energies of approximately 100 GeV and higher. The wide field of view (~2 sr) and high duty cycle (>90) of Milagro make it ideal for searching for transient emission from GRBs.Measurements have been made of GRB spectra up to a few GeV with no sign of a cutoff, however much is still unknown about the nature and existence of this VHE component. While many models predict VHE emission from GRBs, gamma/gamma absorption from infrared background photons or the optically thick region of the burst source complicate observations.In three years of searching the Milagro data set for GRBs with durations ranging from 250μs to 40s, no significant evidence was found for VHE emission from GRBs. Models for GRB redshift and isotropic energy distributions are used to significantly constrain the VHE spectrum of GRBs.
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机译：MilAgro是一种水Cherenkov探测器，能够观察由伽马射线产生的空气淋浴，其能量约为100 GEV和更高。 MilAgro的广泛视野（〜2 sr）和高占空比（> 90）使其成为搜索Grbs的瞬态排放的理想选择。已经由GRB光谱达到几个GEV，没有截止的迹象，然而，这对该VHE组件的性质和存在仍然是尚不清楚的。虽然许多模型预测来自红外背景光子的GMB，伽马/伽马吸收的VHE发射，或者爆破源的光学厚的区域复杂化观察。在三年内搜索GRB的MilAgro数据集，持续时间从250μs到40s的持续时间，没有显着来自GRBS的VHE排放的证据。 GRB Redshift和各向同性能量分布的模型用于显着限制GRB的VHE谱。
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