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

Bin Bin Zhang, Hendrik Van Eerten, David N. Burrows, Geoffrey Scott Ryan, Philip A. Evans, Judith L. Racusin, Eleonora Troja, Andrew Macfadyen

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    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.

    Original languageEnglish (US)
    Article number15
    JournalAstrophysical Journal
    Volume806
    Issue number1
    DOIs
    StatePublished - Jun 10 2015

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    Keywords

    • gamma-ray burst: general
    • methods: numerical

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Zhang, B. B., Eerten, H. V., Burrows, D. N., Ryan, G. S., Evans, P. A., Racusin, J. L., Troja, E., & Macfadyen, A. (2015). AN ANALYSIS of CHANDRA DEEP FOLLOW-UP GAMMA-RAY BURSTS: IMPLICATIONS for OFF-AXIS JETS. Astrophysical Journal, 806(1), [15]. https://doi.org/10.1088/0004-637X/806/1/15