Linear and circular polarization in GRB afterglows

  title={Linear and circular polarization in GRB afterglows},
  author={Lara Nava and Ehud Nakar and Tsvi Piran},
  journal={arXiv: High Energy Astrophysical Phenomena},
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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