2005/08/31 by Rui-Jing Lu, Yi-Ping Qin, Ting-Feng Yi · 1 citation
Physics and Astronomy · #Astrophysics #Detector #Diagram #Full width at half maximum #Gamma-ray burst #Gamma-ray bursts and supernovae #Gaussian #Lorentz factor #Lorentz transformation #Optics #Physics #Pulsars and Gravitational Waves Research #Pulse (music) #Pulse-width modulation #Quantum mechanics #RADIUS #Rise time #Statistics #astro-ph
paper · pdf · doi:10.1088/1009-9271/6/1/006
published as Chin.J.Astron.Astrophys.6:52-60,2006 · 13 pages, 5 figures, 1 table, 2005, ChjAA, in press
arxiv created 2005/10/11 · openalex publication_date 2006/02/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the relationship between the rise width and the full width of gamma-ray burst pulses. Theoretical analysis shows that either width is proportional to Γ −2 Δτ θ,FWHM R c / c (Γ the Lorentz factor of the bulk motion, Δτ θ,FWHM a local pulse's width, R c the radius of fireballs and c the velocity of light). We study the relationship for four samples of observed pulses. We find: (1) merely the curvature effect could reproduce the relationship between the rise and full widths with the same slope as derived from the model of Qin et al.; (2) gamma-ray burst pulses, selected from both the short and long GRBs, follow the same sequence in the rise width vs. full width diagram, with the shorter pulses at one end; (3) all GRBs may intrinsically result from local Gaussian pulses. These features place constraints on the physical mechanism(s) for producing long and short GRBs.