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Spectra and light curves of gamma-ray burst afterglows
The recently discovered gamma-ray burst afterglow is believed to be described reasonably well by synchrotron emission from a decelerating relativistic shell that collides with an external medium. ToExpand
BEAMING IN GAMMA-RAY BURSTS: EVIDENCE FOR A STANDARD ENERGY RESERVOIR
We present a comprehensive sample of all gamma-ray burst (GRB) afterglows with known distances, and we derive their conical opening angles based on observed broadband breaks in their light curves.Expand
The Shape of Spectral Breaks in Gamma-Ray Burst Afterglows
Gamma-ray burst afterglows are well described by synchrotron emission from relativistic blast waves expanding into an external medium. The blast wave is believed to amplify the magnetic field andExpand
On the Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
We consider the effects of inverse Compton scattering of synchrotron photons from relativistic electrons in ?-ray burst (GRB) afterglows. We compute the spectrum of the inverse Compton emission andExpand
Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks, and Compact Spheroids
We present a simple theoretical framework for massive galaxies at high redshift, where the main assembly and star formation occurred, and report on the first cosmological simulations that revealExpand
Predictions for the Very Early Afterglow and the Optical Flash
According to the internal-external shocks model for gamma-ray bursts (GRBs), the GRB is produced by internal shocks within a relativistic flow while the afterglow is produced by external shocks withExpand
Jets in Gamma-Ray Bursts
In the afterglows of several gamma-ray bursts (GRBs), rapid temporal decay, which is inconsistent with spherical (isotropic) blast-wave models, is observed. In particular, GRB 980519 had the mostExpand
A Study of the Afterglows of Four Gamma-Ray Bursts: Constraining the Explosion and Fireball Model
We employ a fireball model of the gamma-ray burst (GRB) explosion to constrain intrinsic and environmental parameters of four events with good broadband afterglow data: GRB 970508, GRB 980329, GRBExpand
The afterglow, redshift and extreme energetics of the γ-ray burst of 23 January 1999
Long-lived emission, known as afterglow, has now been detected from about a dozen γ-ray bursts. Distance determinations place the bursts at cosmological distances, with redshifts, z, ranging from ∼1Expand
Lower Limits on Lorentz Factors in Gamma-Ray Bursts
As is well known, the requirement that gamma-ray bursts be optically thin to high-energy photons yields a lower limit on the Lorentz factor (γ) of the expansion. In this paper, we provide a simpleExpand
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