SVOM-GRM trigger performance study and verification

Jiang He

doi:10.1007/s10686-025-09983-x

2025-02-07

PRE

DOI：10.1007/s10686-025-09983-x

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摘要

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空间多波段天文变体天体监测卫星（SVOM）是中法两国合作开发的卫星，专门设计用于观测和研究伽马射线暴（GRBs）以及其他变体源。在其四个有效载荷中，伽马射线监测器（GRM）负责探测能量范围为15 keV至5 MeV的高能光子，并配备实时触发和定位能力。本文主要聚焦于研究GRM的触发性能。首先，通过使用Geant4模拟工具包获得每个探测器的能量响应矩阵。基于背景模拟结果和给定的GRB样本，估算了仪器对不同方向GRB的探测灵敏度和探测效率。结果表明，GRM对具有较硬能谱的GRB表现出优异的灵敏度，能够使其视场内的超过80%的GRB被触发。通过考虑卫星轨道和姿态，进行了为期3年的GRB观测模拟，结果显示GRM在50-300 keV能量范围内每年可探测约106个GRB。此外，观察到最佳触发能量范围与GRB的硬度指数值相关。最后，我们讨论了GRM已实施的在轨触发算法，并开发了一种基于地面的多时间尺度搜索算法，用于识别潜在的GRB事件。我们的工作有助于理解GRM在轨触发性能特征，同时也为优化地面检测新GRB实例的策略提供了基准，从而增强了利用GRM能力所获得科学产出。

Keyword:

SVOM

GRM

Gamma-ray burst

Sensitivity

Trigger efficiency

期刊

Experimental Astronomy

IF:

2.2

论文数:

111

被引数:

1.9K

机构

chinese acad sci

学者数:

1.8W

论文数: 1.1W

被引数: 4.6K

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