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First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical Source

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arxiv 1906.05521 v1 pith:RH32MCX6 submitted 2019-06-13 astro-ph.HE

M. Amenomori , Y. W. Bao , X. J. Bi , D. Chen , T. L. Chen , W. Y. Chen , Xu Chen , Y. Chen
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Cirennima S. W. Cui Danzengluobu L. K. Ding J. H. Fang K. Fang C. F. Feng Zhaoyang Feng Z. Y. Feng Qi Gao Q. B. Gou Y. Q. Guo H. H. He Z. T. He K. Hibino N. Hotta Haibing Hu H. B. Hu J. Huang H. Y. Jia L. Jiang H. B. Jin F. Kajino K. Kasahara Y. Katayose C. Kato S. Kato K. Kawata M. Kozai Labaciren G. M. Le A. F. Li H. J. Li W. J. Li Y. H. Lin B. Liu C. Liu J. S. Liu M. Y. Liu Y.-Q. Lou H. Lu X. R. Meng H. Mitsui K. Munakata Y. Nakamura H. Nanjo M. Nishizawa M. Ohnishi I. Ohta S. Ozawa X. L. Qian X. B. Qu T. Saito M. Sakata T. K. Sako Y. Sengoku J. Shao M. Shibata A. Shiomi H. Sugimoto M. Takita Y. H. Tan N. Tateyama S. Torii H. Tsuchiya S. Udo H. Wang H. R. Wu L. Xue K. Yagisawa Y. Yamamoto Z. Yang A. F. Yuan L. M. Zhai H. M. Zhang J. L. Zhang X. Zhang X. Y. Zhang Y. Zhang Yi Zhang Ying Zhang Zhaxisangzhu X. X. Zhou (The Tibet ASgamma ollaboration)
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abstract

We report on the highest energy photons from the Crab Nebula observed by the Tibet air shower array with the underground water-Cherenkov-type muon detector array. Based on the criterion of muon number measured in an air shower, we successfully suppress 99.92% of the cosmic-ray background events with energies $E>100$ TeV. As a result, we observed 24 photon-like events with $E>100$ TeV against 5.5 background events, which corresponds to 5.6$\sigma$ statistical significance. This is the first detection of photons with $E>100$ TeV from an astrophysical source.

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  1. Carpet-3 detection of a photon-like air shower with estimated primary energy above 100 TeV in a spatial and temporal coincidence with GRB 221009A

    astro-ph.HE 2025-02 conditional novelty 6.0 of 10

    Carpet-3 reports a photon-like air shower with estimated energy around 300 TeV arriving from the direction of GRB 221009A about 75 minutes after the trigger, with a coincidence probability of about 0.9 percent.

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