A tera-electron volt afterglow from a narrow jet in an extremely bright gamma-ray burst.

Z Cao ,W Zeng,S S Zhang,B Y Pang,H L Dai,H Liu,M L Chen,H Yue,D Bastieri,L P Wang,M Y Liu,M M Ge,Y He,R Wang,K Jiang,J L Liu,Z Y You,W J Long,W J Huang,B Z Dai,H Zhou,L Y Wang,L Shao,X T Huang,R Zhang,D Liu,B Liu,X J Bi,W Wang,H D Liu,H Y Zhang,K Li,Q B Gou,X H You,L X Zhang,D L Xu,K J Zhu,Z H Wang,A Sáiz,J S Liu,Y D Wang,P H T Tam,M Zha,H R Wu,L Q Yin,F Li,J Y He,R X Xu,X X Zhou,S H Chen,S P Zhao,Y J Wang,P H Wang,X T Feng,Z Y Pei,L Xue,V Stepanov,Z G Yao,Y L Feng,Q N Sun,F Aharonian,Y H Yao,Y Zhang,Y J Bi,P F Zhang,Q H Chen,J L Zhang,H H He,C B Wang,P Pattarakijwanich,S B Yang,Y Q Qi,H W Yang,F Zhang,Z C Huang,D X Xiao,W Mitthumsiri,H Y Jia,Q Luo,Y N Liu,Y C Nan,W L Li,F Zheng,C G Zhu,G G Xin,M J Chen,S W Cui,H C Song,K Kurinov,Y M Ye,C Y Wu,J Y Liu,X D Sheng,J Xia,Z Xiong,Y Z Li,Z X Wang,H Y Li,Z K Zeng,X L Ji,Q An,S H Feng,Y A Han,S B Zhang,D Della Volpe,S M Liu,Y Y Guo,G M Xiang,Y K Hor,Y Huang,X P Zhang,E S Chen,G W Wang,S R Zhang,T L Chen,M Y Qi,J C Wang,X Hou,L S Geng,X R Li,S C Hu,J T Cai,D Ruffolo,C Liu,F R Zhu,Y Q Guo,L Zhang,Y Wang,H B Li,Z G Dai,B B Li,P P Zhang,M H Gu,Y H Yu,D Kuleshov,Y F Zhang,K Wang,H C Li,S J Lin,Y J Wei,H H Wang,K Jia,C Wang,M Heller,Jie Zhao ,Lin Chen,Ruo-Yu Liu ,Lixin Bai ,Z Tang ,Ke Tang ,Kai-Kai Duan ,Hongkui Lv ,C Feng ,Ye Chen ,Zhang‐Hua Sun ,Zhe Li,Danzengluobu Danzengluobu,Beiwei Hou ,Fan Yang ,Feng Li ,D Huang ,En‐Wei Liang ,Y Bai ,Kun Fang ,Yang Su ,Ze-Jun Jiang ,Chaowen Yang ,B S Gao ,Jiajun Qin ,L L ,Qi Hu ,Zheng Wang,Houdun Zeng ,Qiang Yuan ,Xian-Zi Dong ,J Mao ,Xinbo He ,Jian Liu ,Mingming Kang ,Jian-Huan Yang ,Sha Sha Wu ,Yaodong Cheng ,Hui Zhu ,Yong Zhang,Tingxuan Zeng ,Xiao-Na Sun ,Rong Zhou ,Ning Cheng ,Xin Li,Jun Fang ,Xiang-Yu Wang ,Xiao Zhang ,Hongbo Hu ,Xiaolei Guo ,Jinhai Zheng ,Qi Gao ,Hong Guang Wang ,Shao-Qiang Xi ,Bin Zhou ,T Q Huang ,Chengyong Gao ,Guanghua Gong ,Bing Zhang ,Chao Hou ,Weiwei Liu ,Xiaohong Cui ,Rui Lü ,Wei Gao ,Qing Cao ,Yuping Wu ,R Yang ,Ping Zhou ,Dahai Yan ,Wen-Jing Cao ,Xue-Feng Wu ,Long Chen,Songzhan Chen ,T Wen ,Cong Li,Fulai Guo ,Ting Yan ,Zhao Liu ,Jianyan Wei ,Jie Liu ,Yu V Stenkin ,Jin Chang ,Zhuo Li,Hao-Ning He ,G C Xiao ,Xiangwei Jiang ,Cheng Li,Yi Liu ,Bing-Qiang Qiao ,Chen Shao ,Liang Chen,O Shchegolev ,Rong Xu ,Jie-Shuang Wang ,Axikegu Axikegu,Jun Yan ,Min Yang ,Yun-Feng Liang ,Bing Zhao ,Hai-Ming Zhang ,Wei Tian ,Jian Li,Zhen Wang,Xiaoyuan Huang ,Na Yin ,Xiang-Gao Wang ,Y Xin ,Ming Jin ,Yudong Cui ,Lili Yang ,Zhe Cao,Bin-Bin Zhang ,Fang Yang ,Zhanpeng Ou ,Jianeng Zhou ,B Q ,Di Li ,Fan Jiang ,Yi Xing ,Huzi Cheng ,Liang Gao ,X H ,Da Ming Wei ,Yi Zhong Fan ,Yiwei Bao ,Xin Zuo

doi:10.1126/science.adg9328

Abstract

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 (LHAASO) of the bright GRB 221009A, which serendipitously occurred within the instrument's 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 and then rose to a peak ~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 of ~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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