What is "pogolite"

PoGOLite (The Polarised Gamma-ray Observer) is a balloon-borne astroparticle physics experiment which is to measure polarisation in hard X-rays and soft gamma-rays. It is sensitive to photons with an energy range of 25-80 keV. PoGOLite contains 217 phoswich detector cells (PDC) which are surrounded by a ring of side anticoincidence shield (SAS) detectors.