Thermal and nonthermal emission from a peculiar long-duration GRB 211211A
Xue-Zhao Chang, Hou-Jun L\"u, Xing Yang, Jia-Ming Chen, and En-Wei, Liang

TL;DR
This study analyzes the spectral and physical properties of long-duration GRB 211211A, revealing evidence for a hybrid jet model with both thermal and nonthermal emissions likely powered by a black hole central engine.
Contribution
It provides a detailed spectral analysis fitting a combined model and infers jet Lorentz factors and magnetization, supporting a hybrid jet origin involving both neutrino annihilation and Blandford-Znajek mechanisms.
Findings
Spectra fit well with a 2SBPL+BB model.
Jet Lorentz factors track with the light curve.
Evidence for Poynting-flux component in the outflow.
Abstract
Long-duration GRB 211211A that lacks a supernova emission even down to very stringent limits at such a low redshift and is associated with kilonova emission, suggests that its physical origin is from a binary compact star merger. By reanalyzing its data observed with the Gamma-Ray Burst Monitor on board the Fermi mission, we find that both time-integrated and time-resolved spectra can be fitted well by using a 2SBPL plus blackbody (2SBPL+BB) model in the prompt emission. The bulk Lorentz factors () of the outflow can be inferred by invoking the observed thermal emission at the photosphere radius within a pure fireball model, and we find out that the temporal evolution of seems to be tracking with the light curve. The derived values of are also consistent with the -/…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astronomy and Astrophysical Research · Astrophysical Phenomena and Observations
