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A delayed 400 GeV photon from GRB 221009A and implication on the intergalactic magnetic field

Author

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  • Zi-Qing Xia

    (Chinese Academy of Sciences)

  • Yun Wang

    (Chinese Academy of Sciences)

  • Qiang Yuan

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Yi-Zhong Fan

    (Chinese Academy of Sciences
    University of Science and Technology of China)

Abstract

Large High Altitude Air Shower Observatory has detected 0.2 − 13 TeV emission of GRB 221009A within 2000 s since the trigger. Here we report the detection of a 400 GeV photon, without accompanying prominent low-energy emission, by Fermi Large Area Telescope in this direction with a 0.4 days’ delay. Given an intergalactic magnetic field strength of about 4 × 10−17 G, which is comparable to limits from TeV blazars, the delayed 400 GeV photon can be explained as the cascade emission of about 10 TeV gamma rays. We estimate the probabilities of the cascade emission that can result in one detectable photon beyond 100 GeV by Fermi Large Area Telescope within 0.3 − 1 days is about 2% whereas it is about 20.5% within 0.3 − 250 days. Our results show that Synchrotron Self-Compton explanation is less favored with probabilities lower by a factor of about 3 − 30 than the cascade scenario.

Suggested Citation

  • Zi-Qing Xia & Yun Wang & Qiang Yuan & Yi-Zhong Fan, 2024. "A delayed 400 GeV photon from GRB 221009A and implication on the intergalactic magnetic field," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48668-5
    DOI: 10.1038/s41467-024-48668-5
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    1. H. Abdalla & R. Adam & F. Aharonian & F. Ait Benkhali & E. O. Angüner & M. Arakawa & C. Arcaro & C. Armand & H. Ashkar & M. Backes & V. Barbosa Martins & M. Barnard & Y. Becherini & D. Berge & K. Bern, 2019. "A very-high-energy component deep in the γ-ray burst afterglow," Nature, Nature, vol. 575(7783), pages 464-467, November.
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