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

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