November 11, 2025The Astrophysical JournalOpen Access

Fermi-GBM Observations of GRB 230307A: An Exceptionally Bright Long-duration Gamma-ray Burst with an Associated Kilonova

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Observational analysis highlights a gamma-ray burst with high fluence and a kilonova, suggesting new insights into long-duration GRBs.

GRB 230307A demonstrated exceptionally high brightness, an important metric in gamma-ray burst analysis.
The gamma-ray burst had a fluence of about 6.02 × 10 −3 erg cm −2, indicating its significant intensity.
Spectral analysis focused on three temporal regions, guiding understanding of synchrotron radiation dynamics.
Insights from GRB 230307A's characteristics may inform our understanding of emerging classes of gamma-ray bursts.

D'Alessi et al. (2025) studied this question.

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