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A certain degree of linear polarization has been measured in several GRBafterglows. More surprisingly, circular polarization has been recently measuredin GRB121024A. For synchrotron emission, the polarization level depends on: (i)the local magnetic field orientation (ii) the geometry of the emitting regionwith respect to the line of sight and (iii) the electron pitch-angledistribution. For this reason, polarization measurements are a valuable tool toprobe afterglow micro-physics. We present numerical estimates of linear andcircular polarization for different configurations (i.e., magnetic fields,geometries and pitch-angle distributions). For each different scenario, westudy the conditions for reaching the maximum and minimum linear and circularpolarization and provide their values. We discuss the implication of ourresults to the micro-physics of GRB afterglows in view of recent polarizationmeasurements.

Linear and circular polarization in GRB afterglows