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<p>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&#xa0;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 5<i>σ</i>. 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&#xa0;trigger, with the chance probability value &#xa0;&lt;2.56 × 10<sup>−5</sup> (after accounting for the look-elsewhere effect), corresponding to a Gaussian-equivalent significance&#xa0; &gt;4.20<i>σ</i>. 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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月18日

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  • Lu-Yao Jiang,
  • Yun Wang,
  • Yu-Jia Wei,
  • Da-Ming Wei,
  • Xiang Li,
  • Hao-Ning He,
  • Jia Ren,
  • Zhao-Qiang Shen,
  • Zhi-Ping Jin

摘要

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  <2.56 × 10−5 (after accounting for the look-elsewhere effect), corresponding to a Gaussian-equivalent significance  >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.