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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2024

Model selection for GRB 211211A through multi-wavelength analyses

Abstract

Although being among the closest gamma-ray bursts, GRB 211211A poses challenges for its classification with partially inconclusive electromagnetic signatures. In this paper, we investigate four different astrophysical scenarios as possible progenitors for GRB 211211A: a binary neutron-star merger, a black-hole--neutron-star merger, a core-collapse supernova, and an r-process enriched core collapse of a rapidly rotating massive star (a collapsar). We perform a large set of Bayesian multi-wavelength analyses based on different models and priors to investigate which astrophysical scenarios and processes might have been related to GRB 211211A. Our analysis supports previous studies in which the presence of an additional component, likely related to $r$-process nucleosynthesis, is required to explain the observed light curves of GRB 211211A, as it can not solely be explained as a GRB afterglow. Fixing the distance to about $350~\rm Mpc$, i.e., the distance of the possible host galaxy SDSS J140910.47+275320.8, we find a statistical preference for the binary neutron-star merger scenario and estimate the component masses to be $1.55^{+0.54}_{-0.42} M_{\odot}$ and $1.34^{+0.25}_{-0.40} M_{\odot}$.
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Dates and versions

hal-03960034 , version 1 (03-01-2024)

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Nina Kunert, Sarah Antier, Vsevolod Nedora, Mattia Bulla, Peter T.H. Pang, et al.. Model selection for GRB 211211A through multi-wavelength analyses. Monthly Notices of the Royal Astronomical Society, 2024, 527 (2), pp.3900-3911. ⟨10.1093/mnras/stad3463⟩. ⟨hal-03960034⟩
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