A tera-electron volt afterglow from a narrow jet in an extremely bright gamma-ray burst.
Zhen Cao, F Aharonian, Q An, Axikegu, L X Bai, Y X Bai, Y W Bao, D Bastieri, X J Bi, Y J Bi, J T Cai, Q Cao, W Y Cao, Zhe Cao, J Chang, J F Chang, E S Chen, Liang Chen, Lin Chen, Long Chen, M J Chen, M L Chen, Q H Chen, S H Chen, S Z Chen, T L Chen, Y Chen, H L Cheng, N Cheng, Y D Cheng, S W Cui, X H Cui, Y D Cui, B Z Dai, H L Dai, Z G Dai, Danzengluobu, D Della Volpe, X Q Dong, K K Duan, J H Fan, Y Z Fan, J Fang, K Fang, C F Feng, L Feng, S H Feng, X T Feng, Y L Feng, B Gao, C D Gao, L Q Gao, Q Gao, W Gao, W K Gao, M M Ge, L S Geng, G H Gong, Q B Gou, M H Gu, F L Guo, X L Guo, Y Q Guo, Y Y Guo, Y A Han, H H He, H N He, J Y He, X B He, Y He, M Heller, Y K Hor, B W Hou, C Hou, X Hou, H B Hu, Q Hu, S C Hu, D H Huang, T Q Huang, W J Huang, X T Huang, X Y Huang, Y Huang, Z C Huang, X L Ji, H Y Jia, K Jia, K Jiang, X W Jiang, Z J Jiang, M Jin, M M Kang, T Ke, D Kuleshov, K Kurinov, B B Li, Cheng Li, Cong Li, D Li, F Li, H B Li, H C Li, H Y Li, J Li, Jian Li, Jie Li, K Li, W L Li, W L Li, X R Li, Xin Li, Y Z Li, Zhe Li, Zhuo Li, E W Liang, Y F Liang, S J Lin, B Liu, C Liu, D Liu, H Liu, H D Liu, J Liu, J L Liu, J L Liu, J S Liu, J Y Liu, M Y Liu, R Y Liu, S M Liu, W Liu, Y Liu, Y N Liu, W J Long, R Lu, Q Luo, H K Lv, B Q Ma, L L Ma, X H Ma, J R Mao, Z Min, W Mitthumsiri, Y C Nan, Z W Ou, B Y Pang, P Pattarakijwanich, Z Y Pei, M Y Qi, Y Q Qi, B Q Qiao, J J Qin, D Ruffolo, A Sáiz, C Y Shao, L Shao, O Shchegolev, X D Sheng, H C Song, Y V Stenkin, V Stepanov, Y Su, Q N Sun, X N Sun, Z B Sun, P H T Tam, Z B Tang, W W Tian, C Wang, C B Wang, G W Wang, H G Wang, H H Wang, J C Wang, J S Wang, K Wang, L P Wang, L Y Wang, P H Wang, R Wang, W Wang, X G Wang, X Y Wang, Y Wang, Y D Wang, Y J Wang, Z H Wang, Z X Wang, Zhen Wang, Zheng Wang, D M Wei, J J Wei, Y J Wei, T Wen, C Y Wu, H R Wu, S Wu, X F Wu, Y S Wu, S Q Xi, J Xia, J J Xia, G M Xiang, D X Xiao, G Xiao, G G Xin, Y L Xin, Y Xing, Z Xiong, D L Xu, R F Xu, R X Xu, L Xue, D H Yan, J Z Yan, T Yan, C W Yang, F Yang, F F Yang, H W Yang, J Y Yang, L L Yang, M J Yang, R Z Yang, S B Yang, Y H Yao, Z G Yao, Y M Ye, L Q Yin, N Yin, X H You, Z Y You, Y H Yu, Q Yuan, H Yue, H D Zeng, T X Zeng, W Zeng, Z K Zeng, M Zha, B Zhang, B B Zhang, F Zhang, H M Zhang, H Y Zhang, J L Zhang, L X Zhang, L Zhang, P F Zhang, P P Zhang, R Zhang, S B Zhang, S R Zhang, S S Zhang, X Zhang, X P Zhang, Y F Zhang, Y Zhang, Yong Zhang, B Zhao, J Zhao, L Zhao, L Z Zhao, S P Zhao, F Zheng, J H Zheng, B Zhou, H Zhou, J N Zhou, P Zhou, R Zhou, X X Zhou, C G Zhu, F R Zhu, H Zhu, K J Zhu, X Zuo
Some gamma-ray bursts (GRBs) have a tera-electron volt (TeV) afterglow, but the early onset of this has not been observed. We report observations with the Large High Altitude Air Shower Observatory of the bright GRB 221009A, which serendipitously occurred within the instrument field of view. More than 64,000 photons >0.2 TeV were detected within the first 3000 seconds. The TeV flux began several minutes after the GRB trigger, then rose to a peak about 10 seconds later. This was followed by a decay phase, which became more rapid ~650 seconds after the peak. We interpret the emission using a model of a relativistic jet with half-opening angle ~0.8°. This is consistent with the core of a structured jet and could explain the high isotropic energy of this GRB.
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