منابع مشابه
Gamma-Ray Burst Afterglows
Extended, fading emissions in multi-wavelength are observed following Gamma-ray bursts (GRBs). Recent broadband observational campaigns led by the Swift Observatory reveal rich features of these GRB afterglows. Here we review the latest observational progress and discuss the theoretical implications for understanding the central engine, composition, and geometric configuration of GRB jets, as w...
متن کاملGamma-Ray Burst Early Afterglows
The successful launch and operation of NASA’s Swift Gamma-Ray Burst Explorer open a new era for the multi-wavelength study of the very early afterglow phase of gamma-ray bursts (GRBs). GRB early afterglow information is essential to explore the unknown physical composition of GRB jets, the link between the prompt γ-ray emission and the afterglow emission, the GRB central engine activity, as wel...
متن کاملPulsed Gamma-Ray-Burst Afterglows
The bipolarity of Supernova 1987A can be understood in terms of its very early light curve as observed from the CTIO 0.4-m telescope, as well as the IUE FES, and the slightly later speckle observations of the “Mystery Spot” by two groups. These observations imply a highly directional beam of light and jet of particles, with initial collimation factors in excess of 104, velocities in excess of 0...
متن کاملRadio scintillation of gamma-ray-burst afterglows ?
Stars twinkle to the eye through atmospheric turbulence, but planets, because of their larger angular size, do not. Similarly, scintillation due to the local interstellar medium will modulate the radio flux of gamma-ray-burst afterglows and may permit indirect measurements of their angular sizes. The amplitude of refractive scintillation is of order ten percent at ten gigahertz unless the sourc...
متن کاملGamma-Ray Burst afterglows: theory and observations
I discuss some theoretical expectations for the synchrotron emission from a relativistic blast-wave interacting with the ambient medium, as a model for GRB afterglows, and compare them with observations. An afterglow flux evolving as a power-law in time, a bright optical flash during and after the burst, and light-curve breaks owing to a tight ejecta collimation are the major predictions that w...
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ژورنال
عنوان ژورنال: Advances in Space Research
سال: 2007
ISSN: 0273-1177
DOI: 10.1016/j.asr.2007.01.016