An Analysis of Chandra Deep Follow-up GRBs: Implications for Off-Axis Jets
Zhang, Bin-Bin · van Eerten, Hendrik · Burrows, David N. · Ryan, Geoffrey Scott · Evans, Philip A. · Racusin, Judith L. · Troja, Eleonora · MacFadyen, Andrew
Original · EN
We present a sample of 27 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 which 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.
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