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- W4386416560 abstract "Abstract GRB 230307A is an extremely bright long-duration GRB with an observed gamma-ray fluence of ≳3 × 10 −3 erg cm −2 (10–1000 keV), second only to GRB 221009A. Despite its long duration, it is possibly associated with a kilonova, thus resembling the case of GRB 211211A. In analogy with GRB 211211A, we distinguish three phases in the prompt gamma-ray emission of GRB 230307A: an initial short duration, spectrally soft emission; a main long duration, spectrally hard burst; and a temporally extended and spectrally soft tail. We interpret the initial soft pulse as a bright precursor to the main burst and compare its properties with models of precursors from compact binary mergers. We find that to explain the brightness of GRB 230307A, a magnetar-like (≳10 15 G) magnetic field should be retained by the progenitor neutron star. Alternatively, in the postmerger scenario, the luminous precursor could point to the formation of a rapidly rotating massive neutron star." @default.
- W4386416560 created "2023-09-05" @default.
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- W4386416560 date "2023-09-01" @default.
- W4386416560 modified "2023-09-27" @default.
- W4386416560 title "A Luminous Precursor in the Extremely Bright GRB 230307A" @default.
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- W4386416560 doi "https://doi.org/10.3847/2041-8213/acf21d" @default.
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