# Constraining the magnetic field in GRB relativistic collisionless shocks using radio data

@article{Duran2014ConstrainingTM,
title={Constraining the magnetic field in GRB relativistic collisionless shocks using radio data},
author={Rodolfo Barniol Duran},
journal={Monthly Notices of the Royal Astronomical Society},
year={2014},
volume={442},
pages={3147-3154}
}
• R. Duran
• Published 5 November 2013
• Physics
• Monthly Notices of the Royal Astronomical Society
Using GRB radio afterglow observations, we calculate the fraction of shocked plasma energy in the magnetic field in relativistic collisionless shocks ($\epsilon_B$). We obtained $\epsilon_B$ for 38 bursts by assuming that the radio afterglow light curve originates in the external forward shock and that its peak at a few to tens of days is due to the passage of the minimum (injection) frequency through the radio band. This allows for the determination of the peak synchrotron flux of the external…

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## References

SHOWING 1-10 OF 54 REFERENCES
Production of Magnetic Energy by Macroscopic Turbulence in GRB Afterglows
• Physics
• 2007
Afterglows of gamma-ray bursts are believed to require magnetic fields much stronger than that of the compressed preshock medium. As an alternative to microscopic plasma instabilities, we propose
The Cosmic-Ray Precursor of Relativistic Collisionless Shocks: A Missing Link in Gamma-Ray Burst Afterglows
• Physics
• 2005
Collisionless shocks are commonly argued to be the sites of cosmic-ray (CR) acceleration. We study the influence of CRs on weakly magnetized relativistic collisionless shocks and apply our results to
On the magnetization of gamma-ray burst blast waves
• Physics
• 2013
The origin of magnetic fields that permeate the blast waves of gamma-ray bursts (GRBs) is a long-standing problem. The present paper argues that in four GRBs revealing extended emission at > 100 MeV,
Evidence for mild deviation from power-law distribution of electrons in relativistic shocks: GRB 090902B
• Physics
• 2011
Many previous studies have determined that the long lasting emission at X-ray, optical and radio wavelengths from gamma-ray bursts (GRBs), called the afterglow, is likely produced by the external
Magnetic Fields in Relativistic Collisionless Shocks
• Physics
• 2013
We present a systematic study on magnetic fields in gamma-ray burst (GRB) external forward shocks (FSs). There are 60 (35) GRBs in our X-ray (optical) sample, mostly from Swift. We use two methods to
A Study of the Afterglows of Four Gamma-Ray Bursts: Constraining the Explosion and Fireball Model
• Physics
• 2003
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, GRB
THE DYNAMICS AND AFTERGLOW RADIATION OF GAMMA-RAY BURSTS. I. CONSTANT DENSITY MEDIUM
• Physics
• 2009
Direct multidimensional numerical simulation is the most reliable approach for calculating the fluid dynamics and observational signatures of relativistic jets in gamma-ray bursts (GRBs). We present
The physics of gamma-ray bursts
Gamma-ray bursts (GRB's), short and intense pulses of low-energy $\ensuremath{\gamma}$ rays, have fascinated astronomers and astrophysicists since their unexpected discovery in the late sixties.
On the Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
• Physics
• 2001
We consider the effects of inverse Compton scattering of synchrotron photons from relativistic electrons in γ-ray burst (GRB) afterglows. We compute the spectrum of the inverse Compton emission and
The Shape of Spectral Breaks in Gamma-Ray Burst Afterglows
• Physics
• 2001
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 and