2024/02/16 by Zhao-Wei Du, Hou-Jun Lü, Du, ZhaoWei +7 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · pdf · doi:10.48550/arxiv.2402.10587
openalex publication_date 2024/02/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recently, a lack of supernova-associated long-duration gamma-ray burst (GRB 230307A) at such a low redshift z=0.065, but associated with a possible kilonova emission, has attracted great attention. Its heavy element nucleosynthesis and the characteristic of soft X-ray emission suggests that the central engine of GRB 230307A is magnetar which is originated from a binary compact star merger. The calculated lower value of ε ∼ 0.05 suggests that the GRB 230307A seems to be with ambiguous progenitor. The lower value of f\rm eff=1.23 implies that the GRB 230307A is not likely to be from the effect of "tip of iceberg". We adopt the magnetar central engine model to fit the observed soft X-ray emission with a varying efficiency and find that the parameters constraints of magnetar fall into a reasonable range, i.e., B<9.4×1015 G and P<2.5 ms for Γ\rm sat = 103, and B<3.6×1015 G and P<1.05 ms for Γ\rm sat = 104. Whether the progenitor of GBR 230307A is from the mergers of neutron star - white dwarf (NS - WD) or neutron star - neutron star (NS - NS) remains unknown.