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2020天文年會
中研院天文所 國際會議廳

論文摘要

On the jet structure of GRBs through X-ray light curve modeling

[ Oral ]

En-Tzu Lin(NTHU), Fergus Hayes(University of Glasgow), Gavin P. Lamb(University of Leicester), Albert K. H. Kong(NTHU), Ik Siong Heng(University of Glasgow)

Mergers of binary neutron stars have been long considered as progenitors of short gamma-ray bursts (GRBs). This idea is confirmed by the detection of the gravitational wave event GW170817 associated with the short GRB 170817A observed by the Fermi gamma-ray telescope at around 2s post-merger (Goldstein et al. 2017). The interaction between the relativistic jet launched by the binary neutron star (BNS) merger and the surrounding medium can produce an after shine across the electromagnetic spectrum. For the case of GRB170817A, a structured jet seen off-axis can explain its afterglow light curve. With the expected increasing number of detections of BNS events in the future, observing GRB afterglow light curves as well as adopting the constraints from gravitational wave observations should help us resolve the structure of these jets. In this work, we performed an analysis with different structured jet models on simulated GRB X-ray light curves for model comparison. The goal of this project is to perform a statistical study to examine how future multi-messenger observations can resolve the intrinsic structure of GRB jets.