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The peculiar GRB 110731A: Lorentz factor, jet composition, central engine, and progenitor by Lü, HouJun; Wang, XiangGao; Lu, RuiJing; Lan, Lin; Gao, He; Liang, EnWei; Graham, Melissa L.; Zheng, WeiKang; Filippenko, Alexei V.; Zhang, Bing is a scholarly article available to read on EtoBox.

What is The peculiar GRB 110731A: Lorentz factor, jet composition, central engine, and progenitor about?

The jet compositions, central engines, and progenitors of gamma-ray bursts (GRBs) remain open questions in GRB physics. Applying broadband observations, including GRB prompt emission and afterglow properties derived from {\em Fermi} and {\em Swift} data, as well as from Keck host-galaxy observations, we address these questions for the peculiar, bright GRB 110731A. By using the pair-opacity method, we derive $\Gamma_{0}>190$ during the prompt emission phase. Alternatively, we derive $\Gamma_{0} \approx 580$ and $\Gamma_{0} \approx 154$ by invoking the early-afterglow phase within the homogeneous density and wind cases, respectively. On the other hand, nondetection of a thermal component in the spectra suggests that the prompt emission is likely powered by dissipation of a Poynting-flux-dominated jet leading to synchrotron radiation in an optically thin region. The nondetection of a jet break in the X-ray and optical bands allows us to place a lower limit on the jet opening angle $\theta_{\rm j}>5.5^{\circ}$. Within a millisecond magnetar central engine scenario, we derive the period $P_{0}$ and polar magnetic field strength $B_{\rm p}$, which have extreme (but still allowed) values.

Author

Lü, HouJun; Wang, XiangGao; Lu, RuiJing; Lan, Lin; Gao, He; Liang, EnWei; Graham, Melissa L.; Zheng, WeiKang; Filippenko, Alexei V.; Zhang, Bing

Published

2017

Language

EN