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The Gas Pixel Detector (GPD) is a new generation device which, thanks to its50 um pixels, is capable of imaging the photoelectrons tracks produced byphotoelectric absorption in a gas. Since the direction of emission of thephotoelectrons is strongly correlated with the direction of polarization of theabsorbed photons, this device has been proposed as a polarimeter for the studyof astrophysical sources, with a sensitivity far higher than the instrumentsflown to date. The GPD has been always regarded as a focal plane instrument andthen it has been proposed to be included on the next generation space-bornemissions together with a grazing incidence optics. Instead in this paper weexplore the feasibility of a new kind of application of the GPD and of thephotoelectric polarimeters in general, i.e. an instrument with a large field ofview. By means of an analytical treatment and measurements, we verify if it ispossible to preserve the sensitivity to the polarization for inclined beams,opening the way for the measurement of X-ray polarization for transientastrophysical sources. While severe systematic effects arise for inclinationgreater than about 20 degrees, methods and algorithms to control them arediscussed.

The Gas Pixel Detector as an X-ray photoelectric polarimeter with a large field of view