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Special AT seminar by Fabian Kislat 7.7.2017

X-ray and gamma-ray imaging, spectroscopy and timing missions have 
revolutionized our understanding of compact astrophysical objects in the last
few decades. Polarimetry promises qualitatively new insights by providing two
new observables: the polarization fraction and angle. These new observables
carry geometrical information about regions that are only pico-arcseconds
across in the sky, too small to be imaged by any current or planned telescope,
at any wavelength.
In this talk, I will review the scientific potential of X-ray and gamma-ray
polarimetry from sub-keV to MeV energies and provide an overview of the 
technical approaches covering this broad energy range. I will report on the 
2016 flight of the balloon-borne hard X-ray polarimeter X-Calibur. Finally, I 
will conclude by giving an outlook to future funded and planned missions: the 
Imaging X-ray Polarimetry Explorer (IXPE), the X-ray Polarimetry Probe (XPP)
concept, and the All-Sky Medium Energy Gamma-ray Observatory (AMEGO).
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