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Probable evidence for a transient mega-electron volt emission line in the GRB 221023A

Author

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  • Lu-Yao Jiang

    (Purple Mountain Observatory, Chinese Academy of Sciences
    University of Science and Technology of China)

  • Yun Wang

    (Purple Mountain Observatory, Chinese Academy of Sciences)

  • Yu-Jia Wei

    (Purple Mountain Observatory, Chinese Academy of Sciences
    University of Science and Technology of China
    525 Davey Laboratory
    The Pennsylvania State University)

  • Da-Ming Wei

    (Purple Mountain Observatory, Chinese Academy of Sciences
    University of Science and Technology of China)

  • Xiang Li

    (Purple Mountain Observatory, Chinese Academy of Sciences
    University of Science and Technology of China)

  • Hao-Ning He

    (Purple Mountain Observatory, Chinese Academy of Sciences
    University of Science and Technology of China)

  • Jia Ren

    (Purple Mountain Observatory, Chinese Academy of Sciences)

  • Zhao-Qiang Shen

    (Purple Mountain Observatory, Chinese Academy of Sciences)

  • Zhi-Ping Jin

    (Purple Mountain Observatory, Chinese Academy of Sciences
    University of Science and Technology of China)

Abstract

Detection of spectral line in gamma-ray bursts (GRBs) is importance for studying GRB physics, as it provides insights into the composition and physical conditions of the GRB environment. However, progress in detecting X-ray or gamma-ray emission and absorption lines in GRB spectra has been relatively slow, only the narrow emission line feature of about 10 MeV found in GRB 221009A has exhibited a significance exceeding 5σ. Here, we report the probable evidence of a narrow emission feature at about 2.1 mega-electron volts (MeV) in the spectrum of GRB 221023A. The highest statistical significance of this feature is observed in the time interval between 8 and 30 seconds after Fermi Gamma-Ray Burst Monito trigger, with the chance probability value 4.20σ. We interpret this festure as being generated through the de-excitation of excited electrons in the relativistic hydrogen-like high-atomic-number ions entrained in the GRB jet.

Suggested Citation

  • Lu-Yao Jiang & Yun Wang & Yu-Jia Wei & Da-Ming Wei & Xiang Li & Hao-Ning He & Jia Ren & Zhao-Qiang Shen & Zhi-Ping Jin, 2025. "Probable evidence for a transient mega-electron volt emission line in the GRB 221023A," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57791-w
    DOI: 10.1038/s41467-025-57791-w
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