Although GRB 211211A is one of the closest gamma-ray bursts (GRBs), its classification is challenging because of its 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 describing these scenarios and priors to investigate which astrophysical scenarios and processes might be 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 350Mpc, namely the distance of the possible host galaxy SDSS J140910.47+275320.8, we find a statistical preference for a binary neutron-star merger scenario.
@article{arxiv.2301.02049,
title = {Bayesian model selection for GRB 211211A through multi-wavelength analyses},
author = {Nina Kunert and Sarah Antier and Vsevolod Nedora and Mattia Bulla and Peter T. H. Pang and Shreya Anand and Michael Coughlin and Ingo Tews and Jennifer Barnes and Thomas Hussenot-Desenonges and Brian Healy and Theophile Jegou du Laz and Meili Pilloix and Weizmann Kiendrebeogo and Tim Dietrich},
journal= {arXiv preprint arXiv:2301.02049},
year = {2023}
}