Swift X-ray Afterglows and the Missing Jet Break Problem
J. L. Racusin (1), E.-W. Liang (2,3), D. N. Burrows (1), D. C. Morris, (1), B. B. Zhang (2), B. Zhang (2) ((1) Pennsylvania State University, (2), University of Nevada, Las Vegas, (3) Guangxi University)
TL;DR
This paper systematically analyzes Swift-XRT X-ray afterglows of GRBs to investigate the absence of expected jet breaks, comparing observations with forward shock models to understand their physical origin.
Contribution
It provides a comprehensive catalog and analysis of GRB X-ray afterglows, addressing the missing jet break problem through systematic comparison with theoretical models.
Findings
Identification of light curve segments consistent with forward shock models
Evidence for the absence of expected jet breaks in many afterglows
Insights into the physical mechanisms behind missing jet breaks
Abstract
We present a systematic survey of the temporal and spectral properties of all GRB X-ray afterglows observed by Swift-XRT between January 2005 and July 2007. We have constructed a catalog of all light curves and spectra and investigate the physical origin of each afterglow segment in the framework of the forward shock models by comparing the data with the closure relations. We search for possible jet-like breaks in the lightcurves and try to explain some of the "missing" X-ray jet breaks in the lightcurves.
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