AN ANALYSIS OF CHANDRA DEEP FOLLOW-UP GAMMA-RAY BURSTS: IMPLICATIONS FOR OFF-AXIS JETS

作者：Zhang Bin Bin^*; van Eerten Hendrik; Burrows David N; Ryan Geoffrey Scott; Evans Philip A; Racusin Judith L; Troja Eleonora; MacFadyen Andrew

来源：Astrophysical Journal, 2015, 806(1): 15.

DOI：10.1088/0004-637X/806/1/15

• gamma-ray burst: general
• methods: numerical

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-simulationbased 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.

• 出版日期2015-6-10