October 19, 2025Open Access

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

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Fermi-GBM captured GRB 230307A, an exceptionally luminous gamma-ray burst with a kilonova, suggesting novel spectral traits.

GRB 230307A is noted for its high fluence and complexity in spectral analysis, revealing distinct temporal characteristics.
The event exhibited a fluence of (6.02 ± 0.02)×10^-3 erg cm^-2, indicating one of the brightest gamma-ray bursts observed to date.
Fine time-resolution analysis identified key emission phases, suggesting synchrotron radiation behaviors and a notable decay in late intervals.
Inferred parameters, including a bulk Lorentz factor of Γ= 1600, provide valuable data for understanding long-duration gamma-ray bursts.

Dalessi et al. (2025) studied this question.

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