AN ANALYSIS of CHANDRA DEEP FOLLOW-UP GAMMA-RAY BURSTS: IMPLICATIONS for OFF-AXIS JETS

DOI: 
10.1088/0004-637X/806/1/15
Publication date: 
10/06/2015
Main author: 
Zhang B.-B.
IAA authors: 
Zhang B.-B.
Authors: 
Zhang B.-B., Eerten H.V., Burrows D.N., Ryan G.S., Evans P.A., Racusin J.L., Troja E., Macfadyen A.
Journal: 
Astrophysical Journal
Publication type: 
Article
Volume: 
806
Pages: 
Number: 
15
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.
Database: 
SCOPUS
WOK
SCOPUS
Keywords: 
gamma-ray burst: general; methods: numerical