Description of the payload
The Gamma-RAy Polarimeter Experiment (GRAPE) is a Compton polarimeter designed to measure the polarization of astronomical sources in the soft gamma-ray band (50 - 500 keV) from a high-altitude balloon platform. Although designed primarily for studies of gamma-ray bursts over the entire sky, the instrument can also be combined with a collimator for pointed observations.
Details of the balloon flight and scientific outcome
External references and bibliographical sources