Very high-energy gamma-ray emission beyond 10 TeV from GRB 221009A.

The highest-energy gamma-rays from gamma-ray bursts (GRBs) have important implications for their radiation mechanism. Here we report the detection of gamma-rays up to 13 teraelectronvolts from the brightest GRB 221009A by the Large High Altitude Air-shower Observatory (LHAASO). The LHAASO-KM2A detector registered more than 140 gamma-rays with energies above 3 teraelectronvolts during 230 to 900 seconds after the trigger. The intrinsic energy spectrum of gamma-rays can be described by a power-law after correcting for extragalactic background light absorption. Such a hard spectrum challenges the synchrotron self-Compton scenario of relativistic electrons for the afterglow emission above several teraelectronvolts. Observations of gamma-rays up to 13 teraelectronvolts from a source with a measured redshift of z = 0.151 hints more transparency in intergalactic space than previously expected. Alternatively, one may invoke new physics such as Lorentz invariance violation or an axion origin of very high-energy signals.

Danzengluobu | Axikegu | L. L. Yang | P. Pattarakijwanich | T. Zeng | M. Chen | Xin Li | Y. Chen | D. Semikoz | H. Wu | H. Zhu | F. Zhang | Cheng Li | G. Gong | Y. Hor | Y. Stenkin | S. Gabici | Q. Gou | D. Bastieri | R. Xu | X. Cui | Y. Xin | P. Tam | H. He | W. Mitthumsiri | H. Zhou | G. Xiao | S. Feng | Cong Li | N. Cheng | H. Zhang | M. Heller | A. Neronov | L. Zhao | C. Hou | B. Gao | M. Chen | H. C. Li | L. X. Zhang | B. Qiao | J. Xia | C. Gao | S. Z. Chen | Z. Huang | Q. Sun | G. Giacinti | X. Ji | L. Yin | K. Duan | W. Li | W. Tian | S. Xi | X. He | X. Zhou | F. Zhu | D. Huang | H. Jia | R. Liu | X. Ma | Q. Tang | R. Yang | Z. Yao | S. Zhang | T. Chen | S. M. Liu | H. He | X. G. Wang | X. You | J. Qin | X. Dong | J. Liu | Y. Bi | L. Gao | Zhen Wang | J. Zhou | E. Chen | Y. Bao | C. Feng | H. Hu | W. Liu | S. Zhao | B. Dai | S. Chen | L. Geng | X. Guo | X. Hou | K. Jiang | D. Kuleshov | H. Li | L. Shao | H. Song | V. Stepanov | Z. Sun | L. Wang | S. Wu | G. Xiang | G. Xin | C. Yang | F. Yang | J. Yang | M. Yang | H. Zeng | S. Zhang | F. Zheng | B. Zhou | K. Zhu | J. Fan | Y. He | H. Dai | X. Feng | D. Li | X. Y. Huang | J. Liu | Long Chen | F. Guo | T. Ke | Jian Li | Jie Li | Zhe Li | J. Wei | R. Wang | Q. Cao | Weicang Wang | J. Yan | M. Kang | Y. Bai | X. Bi | J. Cai | W. Gao | K. Jia | B. Li | H. B. Li | Y. Liang | B. Liu | Q. Luo | B. Ma | Z. Pei | C. Shao | L. Y. Wang | D. Xiao | D. Xu | H. W. Yang | N. Yin | Y. Yu | H. Yue | B. Zhang | S. B. Zhang | Yi. Zhang | J. Zhao | J. Fang | W. Cao | Y. Wu | Y. Yao | Q. Gao | H. Zhang | Q. Chen | Z. X. Wang | S. Hu | Z. H. Wang | J. C. Wang | Z. Jiang | X. N. Sun | Y. J. Wang | S. Lin | M. Zhou | T. Q. Huang | Y. Su | R. Xu | L. Feng | R. Zhou | K. Li | O. Shchegolev | Y. Feng | Y. J. Wei | Y. Han | X. Huang | K. Kurinov | Y. Liu | G. W. Wang | H. Wang | H. H. Wang | P. Wang | W. Xu | T. Yan | R. Zhang | J. L. Zhang | Y. Huang | D. Liu | Y. Z. Fan | A. S'aiz | M. Y. Liu | Q. Hu | Y. Q. Guo | Y. Zhang | R. Lu | X. Zhang | Z. Min | L. Ma | K. Wang | M. Gu | F. Li | Z. You | Zhen Cao | F. Aharonian | Q. An | J. Chang | A. M. Chen | Liang Chen | Lin Chen | Y. D. Cheng | M. Cui | S. Cui | Y. Cui | Z. Dai | D. D. Volpe | K. Fang | M. Ge | Y. Y. Guo | J. Y. He | B. Hou | W. J. Huang | X. W. Jiang | M. Jin | J. Li | X. R. Li | Y. Li | Zhuo Li | E. W. Liang | C. Liu | H. Liu | H. Lv | J. Mao | H. Mu | Y. Nan | Z. Ou | B. Pang | M. Qi | Y. Qi | D. Ruffolo | X. Sheng | F. Shu | Z. Tang | C. Wang | X. Y. Wang | Y. Wang | Zhenghan Wang | D. Wei | T. Wen | C. Y. Wu | X. F. Wu | Y. Xing | Z. Xiong | L. Xue | D. H. Yan | S. B. Yang | Y. Ye | Q. Yuan | W. Zeng | M. Zha | Li Zhang | P. Zhang | P. P. Zhang | Yong Zhang | B. Zhao | P. Zhou | C. G. Zhu | X. Zuo

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