GECAM对高能暂现源的定位及其系统误差
天体物理仪器与方法
2023-03-08 v2 高能天体物理现象
摘要
引力波高能电磁对应体全天监测器（GECAM）是一对专用于监测伽马射线暂现源的微卫星（即GECAM-A和GECAM-B），其监测对象包括引力波高能电磁对应体、伽马射线暴、软伽马射线重复暴、太阳耀斑和地球伽马射线闪。自2020年12月发射以来，GECAM-B已探测到数百个天文和地球事件。对于这些暴发事件，定位是进行暴发识别、分类以及多波段后续观测的关键。本文提出了一种基于泊松数据与高斯背景轮廓似然的贝叶斯定位方法，利用不同指向探测器的暴发计数分布来定位GECAM暴。我们证明该方法适用于所有类型的暴发，尤其是极短暴。此外，我们提出了一种基于置信水平检验的定位系统误差估计新方法，该方法能克服文献中现有方法的一些问题。我们通过蒙特卡洛模拟验证了该方法，并将其应用于一个具有精确位置的暴发样本，发现GECAM-B定位系统误差的平均值约为。通过考虑此系统误差，我们可以获得可靠的GECAM暴发定位概率图。我们的方法可应用于其他伽马射线监测器。
引用
@article{arxiv.2211.15570,
title = {GECAM Localization of High Energy Transients and the Systematic Error},
author = {Yi Zhao and Wang-Chen Xue and Shao-Lin Xiong and Yuan-Hao Wang and Jia-Cong Liu and Qi Liuo and Yan-Qiu Zhang and Jian-Chao Sun and Xiao-Yun Zhao and Ce Cai and Shuo Xiao and Yue Huang and Xiao-Bo Li and Zhen Zhang and Jin-Yuan Liao and Sheng Yang and Rui Qiao and Dong-Ya Guo and Chao Zheng and Qi-Bin Yi and Sheng-Lun Xie and Zhi-Wei Guo and Chao-Yang Li and Chen-Wei Wang and Wen-Jun Tan and Yue Wang and Wen-Xi Peng and Shi-Jie Zheng and Jian-Jian He and Ping Wang and Jin Wang and Xiang Ma and Xin-Ying Song and Hong-Mei Zhang and Bing Li and Peng Zhang and Hong Wu and Yan-Qi Du and Jing Liang and Guo-Ying Zhao and Xin-Qiao Li and Xiang-Yang Wen and Zheng-Hua An and Xi-Lei Sun and Yan-Bing Xu and Fan Zhang and Da-Li Zhang and Ke Gong and Ya-Qing Liu and Xiao-Hua Liang and Xiao-Jing Liu and Min Gao and Jin-Zhou Wang and Li-Ming Song and Gang Chen and Ke-Ke Zhang and Xing-Bo Han and Hai-Yan Wu and Tai Hu and Hao Geng and Fang-Jun Lu and Shu Zhang and Shuang-Nan Zhang and Gao-Peng Lu and Ming Zeng and Heng Yu},
journal= {arXiv preprint arXiv:2211.15570},
year = {2023}
}
备注
The paper has been accepted by Astrophysical Journal Supplement Series