Overview of High Energy Astronomical Polarimetry

Joe Hill, J. Kevin Black, Keith Jahoda

Polarimetry promises to be an important tool for discriminating between competing models in many areas of high-energy astrophysics including black holes, pulsars, and gamma-ray bursts. However, limitations in instrumental sensitivity have limited progress since the first measurement of the Crab in the 1970’s.  In recent years there have been numerous efforts to develop instruments with the sensitivity required for astronomical polarimetry between 100 eV to 10 GeV. We will describe the historical measurements, the available techniques, and the missions proposed that will make these measurements a reality.