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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 F4.

Correction for instrumental effects across varying flux levels. (a)–(f) Verification of the baseline correction under low-flux conditions using six revisiting orbits preceding the burst. Compared to the raw data (red data points), the dead-time-corrected energy spectrum count rate (black data points) shows a linear relationship with the total telemetry count rate, where y = x. (g) Saturation analysis during the main burst phase of GRB 221009A. The conventional dead-time correction (black points) deviates from linearity as telemetry rates exceed ∼4000 counts per second (cps). (h) High-flux signal recovery via the comprehensive DAQ correction (blue points). The black dashed line represents the ideal linear identity (y = x).

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