Linear and circular polarization in GRB afterglows

@article{Nava2015LinearAC,
  title={Linear and circular polarization in GRB afterglows},
  author={Lara Nava and Ehud Nakar and Tsvi Piran},
  journal={arXiv: High Energy Astrophysical Phenomena},
  year={2015}
}
A certain degree of linear polarization has been measured in several GRB afterglows. More surprisingly, circular polarization has been recently measured in GRB121024A. For synchrotron emission, the polarization level depends on: (i) the local magnetic field orientation (ii) the geometry of the emitting region with respect to the line of sight and (iii) the electron pitch-angle distribution. For this reason, polarization measurements are a valuable tool to probe afterglow micro-physics. We… 

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References

SHOWING 1-8 OF 8 REFERENCES
Circular polarization in the optical afterglow of GRB 121024A
TLDR
It is suggested that new models are required to produce the complex microphysics of realistic shocks in relativistic jets, and the detection of circularly polarized light in the afterglow of GRB 121024A is reported, measured 0.15 days after the burst.
Linear Polarization and Proper Motion in the Afterglow of Beamed Gamma-Ray Bursts
We investigate the polarization and proper motion from a beamed gamma-ray burst's ejecta. We find that even if the magnetic field has well-defined orientation relative to the direction of motion of
LINEAR POLARIZATION IN GAMMA-RAY BURSTS: THE CASE FOR AN ORDERED MAGNETIC FIELD
Linear polarization at the level of ~1%-3% has by now been measured in several gamma-ray burst afterglows. Whereas the degree of polarization, P, was found to vary in some sources, the position
The circular polarization of sources of synchrotron radiation
AbstractThe degree of circular polarizationpc is calculated for two models of a source of synchrotron radiation:(1)A source with an inhomogeneous magnetic field and isotropic angular distribution of
Elliptic Polarization of Synchrotron Radiation
of symmetry between the source components. The elongation of the components in the direction of separation, noted for a few sources by Moffet (1964), is seen in 60% of these sources. In Figure \b the
The Most Probable Cause for the High Gamma-Ray Polarization in GRB 021206
The exciting detection of a very high degree of linear polarization, , in the prompt g-ray P p 80% 20% emission of the recent gamma-ray burst GRB 021206 provides strong evidence that synchrotron
The Polarization of Synchrotron Radiation.
Generation and Transfer of Polarized Synchrotron Radiation.