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

Nat Commun · 2025 · PMC11920065 · PMID 40102382

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highly significantno p-value reported

More recently, a highly significant (>5 σ ) narrow emission feature around 10 MeV has been detected in the Fermi data of GRB 221009A 22 , 23 .

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marginally significantno p-value reported

We find a marginally significant narrow emission feature around 2.1 MeV.

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marginally statistically significantno p-value reported

Comparison with GRB 221009A The spectral analysis of GRB 221023A reveals a marginally statistically significant narrow emission feature at around 2.1 MeV.

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