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Spectra and Light Curves of Gamma-Ray Burst Afterglows
Re'em Sari, Tsvi Piran, Ramesh Narayan
The recently discovered GRB afterglow is believed to be described reasonably well by synchrotron emission from a slowing down relativistic shell that collides with an external medi…
The Observed Size and Shape of GRB Afterglow
Re'em Sari
The detection of delayed emission in X-ray, optical and radio wave length, ``afterglow'', following a gamma-ray burst can be described by the emission of a relativistic shell decel…
Hydrodynamics of GRB After-Glow
Re'em Sari
The detection of delayed emission at X-ray optical and radio wavelengths, ``after-glow'', suggests that the relativistic shell which emitted the initial GRB due to internal shocks…
Can internal shocks produce the variability in GRBs?
Shiho Kobayashi, Tsvi Piran, Re'em Sari
We discuss the possibility that gamma-ray bursts result from internal shocks in an ultra-relativistic matter. Using a simple model we calculate the temporal structure and we estima…
Implication of Temporal Structure in GRB
Tsvi Piran, Re'em Sari
The highly variable temporal structure observed in most GRBs provides us with unexpected clues. We show that variable GRBs cannot be produced by external shocks models and conseque…
Variability in GRBs - A Clue
Re'em Sari, Tsvi Piran
We show that external shocks cannot produce a variable GRB, unless they are produced by an extremely narrow jets (angular opening of < ~10^{-4}) or if only a small fraction of the…