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Detection of 2 MeV Spectral Bump and ∼40 MeV Emission Line from GRB 221009A

Authors: Zhi-Qiang Ding, Zhenxia Zhang, Yanqiu Zhang, Rui-Ze Shi, Xinqiao Li, Zhuo Li, Zhenghua An, Shaolin Xiong, Roberto Battiston, Shuangnan Zhang, Hua Feng, Dali Zhang, Yanbing Xu, Ping Wang, Xiaoyun Zhao, Yuqian Ma, Hong Lu, Xiangyang Wen, Yongjie Zhang, Xuhui Shen, Shigeng Yuan, Siquan Yang, Rongxue Kang, Chao Zheng, Yan Huang, Wen Su, Shengli Liu, Hui Wang, Xiaohua Liang, Jinzhou Wang, Ke Gong, Xiaojing Liu, Yaqing Liu, Sheng Yang, Zeren Zhima, Jianping Huang, Wei Chu, Na Zhou, Roberto Iuppa, Francesco Maria Follega, Marco Cristoforetti, Wangchen Xue, Lu Wang, Jiaqi Zheng, Jiacong Liu, Chenwei Wang, Wenjun Tan, Zhenghang Yu, Shujie Li, Hao Hong

Zhi-Qiang Ding et al 2026 The Astrophysical Journal Letters 1012 .

Provider: AAS Journals

Caption: Figure F11.

Satellite orbit and flux distribution during GRB occurrence. The figure shows the ground track of the CSES-01 satellite during orbit 259770 on 2022 October 9. The color scale along the track indicates the electron flux measured by HEPP-L. The green rectangular box highlights the segment of the orbit over Europe where electron pulses corresponding to the transient emission from GRB 221009A were detected. This specific location corresponds to a stable region within the inner radiation belt.

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