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We have measured the linear polarisation of hard X-ray emission from the Crabin a previously unexplored energy interval, 20-120 keV. The introduction of twonew observational parameters, the polarisation fraction and angle stands todisentangle geometrical and physical effects, thereby providing information onthe pulsar wind geometry and magnetic field environment. Measurements areconducted using the PoGOLite Pathfinder - a balloon-borne polarimeter.Polarisation is determined by measuring the azimuthal Compton scattering angleof incident X-rays in an array of plastic scintillators housed in ananticoincidence well. The polarimetric response has been characterised prior toflight using both polarised and unpolarised calibration sources. We addresspossible systematic effects through observations of a background field. Themeasured polarisation fraction for the integrated Crab light-curve is($18.4^{+9.8}_{-10.6}$)%, corresponding to an upper limit (99% credibility) of42.4%, for a polarisation angle of ($149.2\pm16.0)^\circ$.

Observation of polarised hard X-ray emission from the Crab by the PoGOLite Pathfinder