DOI:
10.1088/0004-637X/806/1/15
Authors:
Zhang B.-B., Eerten H.V., Burrows D.N., Ryan G.S., Evans P.A., Racusin J.L., Troja E., Macfadyen A.
Abstract:
We present a sample of 27 gamma-ray bursts (GRBs) with detailed Swift light curves supplemented by late-time Chandra observations. To answer the missing jet-break problem in general, we develop a numerical-simulation-based model that can be directly fit to the data using Monte Carlo methods. Our numerical model takes into account all the factors that can shape a jet break: (i) lateral expansion, (ii) edge effects, and (iii) off-axis effects. Our results provide improved fits to the light curves and constraints on physical parameters. More importantly, our results suggest that off-axis effects are important and must be included in interpretations of GRB jet breaks. © 2015. The American Astronomical Society. All rights reserved.
Keywords:
gamma-ray burst: general; methods: numerical