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GAMMA-RAY BURST AFTERGLOW WITH CONTINUOUS ENERGY INJECTION: SIGNATURE OF A HIGHLY MAGNETIZED MILLISECOND PULSAR
We investigate the consequences of a continuously injecting central engine on the gamma-ray burst afterglow emission, focusing more specifically on a highly magnetized millisecond pulsar engine. For… Expand
The Internal-collision-induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-ray Bursts
The recent Fermi observation of GRB 080916C shows that the bright photosphere emission associated with a putative fireball is missing, which suggests that the central engine likely launches a… Expand
Low-Luminosity Gamma-Ray Bursts as a Unique Population: Luminosity Function, Local Rate, and Beaming Factor
Swift BAT has detected ~200 long-duration GRBs, with redshift measurements for ~50 of them. We derive the luminosity function (?HL) and the local event rate (?) of the conventional high-luminosity… Expand
A Comprehensive Analysis of Swift XRT Data. II. Diverse Physical Origins of the Shallow Decay Segment
The origin of the shallow decay segment in Swift XRT light curves remains a puzzle. We analyze the properties of this segment with a sample of 53 long Swift GRBs detected before 2007 February. We… Expand
Early Optical Afterglows from Wind-Type Gamma-Ray Bursts
We study prompt optical emission from reverse shocks in wind-type gamma-ray bursts. The emission is evaluated in both the thick- and thin-shell regimes. We discuss the angular time delay effect and… Expand
GAMMA-RAY BURST EARLY AFTERGLOWS: REVERSE SHOCK EMISSION FROM AN ARBITRARILY MAGNETIZED EJECTA
Evidencesuggeststhatgamma-ray burst(GRB) ejectaarelikelymagnetized,althoughthedegreeof magnetization is unknown. When such magnetized ejecta are decelerated by the ambient medium, the characteristics… Expand
GAMMA-RAY BURST BEAMING: A UNIVERSAL CONFIGURATION WITH A STANDARD ENERGY RESERVOIR?
We consider a gamma-ray burst (GRB) model based on an anisotropic fireball with an axisymmetric energy distribution of the form (θ) θ-k and allow for the observer's viewing direction being at an… Expand
MODEL-INDEPENDENT MULTIVARIABLE GAMMA-RAY BURST LUMINOSITY INDICATOR AND ITS POSSIBLE COSMOLOGICAL IMPLICATIONS
Without imposing any theoretical models and assumptions, we present a multivariable regression analysis to several observable quantities for a sample of 15 gamma-ray bursts (GRBs). The observables… Expand
A Comprehensive Analysis of Swift XRT Data. I. Apparent Spectral Evolution of Gamma-Ray Burst X-Ray Tails
An early steep decay component following the prompt GRBs is commonly observed in Swift XRT light curves, which is regarded as the tail emission of the prompt gamma rays. Prompted by the observed… Expand
Variabilities of Gamma-Ray Burst Afterglows: Long-acting Engine, Anisotropic Jet, or Many Fluctuating Regions?
We show that simple kinematic arguments can give limits on the timescale and amplitude of variabilities in gamma-ray burst (GRB) afterglows, especially when the variability timescale is shorter than… Expand