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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 1.

Temporal evolution of GRB 221009A observed by GECAM-C (HEBS) and CSES-01. (a) The light curve from GECAM-C in the 400 keV–6 MeV range, showing the primary gamma-ray emission. The GECAM-C data are shown starting from approximately T_ref + 180 s because the preceding interval was contaminated by high background due to the high-latitude effect (Z.-H. An et al. 2023). Panels (a) and (c) show the energy-time spectrogram and integrated light curve (250 keV–3 MeV) of the secondary particles detected by HEPP-L, respectively. Panels (d) and (e) show the corresponding spectrogram and integrated light curve (1–255 MeV) from HEPP-H, respectively. The vertical red line marks the time of the main emission peak.

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