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Ultra Efficient Internal Shocks
Shiho Kobayashi, Re'em Sari
Gamma-ray bursts are believed to originate from internal shocks which arise in an irregular relativistic wind. The process has been thought to be inefficient, converting only a few…
Lower Limits on Lorentz Factors in Gamma Ray Bursts
Yoram Lithwick, Re'em Sari
As is well-known, the requirement that gamma ray bursts (GRB's) be optically thin to high energy photons yields a lower limit on the Lorentz factor (γ) of the expansion. In this pa…
On The Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
Re'em Sari, Ann A. Esin
We consider the effects of inverse Compton scattering of synchrotron photons from relativistic electrons in GRB afterglows. We compute the spectrum of the inverse Compton emission…
Impulsive and Varying Injection in GRB Afterglows
Re'em Sari, Peter Meszaros
The standard model of Gamma-Ray Bursts afterglows is based on synchrotron radiation from a blast wave produced when the relativistic ejecta encounters the surrounding medium. We re…
The afterglows of gamma-ray bursts
S. R. Kulkarni, E. Berger, J. S. Bloom +9
Gamma-ray burst astronomy has undergone a revolution in the last three years, spurred by the discovery of fading long-wavelength counterparts. We now know that at least the long du…
Beaming and Jets in GRBs
Re'em Sari
The origin of GRBs have been a mystery for almost 30 years. The afterglow observed in the last few years enabled redshift determination for a handful of bursts, and the cosmologica…
The Synchrotron Spectrum of Fast Cooling Electrons Revisited
Jonathan Granot, Tsvi Piran, Re'em Sari
We discuss the spectrum arising from synchrotron emission by fast cooling (FC) electrons, when fresh electrons are continually accelerated by a strong blast wave, into a power law…