12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room E(106/107)

[GA181] The Compton Spectrometer and Imager (COSI)


  • Jeng-Lun CHIU

Primary authors



The Compton Spectrometer and Imager (COSI) is a balloon-borne soft gamma-ray (0.2-5 MeV) telescope designed to study astrophysical sources of nuclear line emission and gamma-ray polarization. The heart of COSI is a compact array of cross-strip germanium detectors (GeDs), providing excellent spectral resolution (0.3% at 662 keV) and capability of tracking photon scattering history with full 3D position resolution of less than 2 mm^3 for each interaction. The most recent balloon flight of COSI was launched from Wanaka, New Zealand, in May 2016 on a Super Pressure Balloon floating for 46 days. During this flight, COSI discovered GRB160530A and detected several sources, including the Crab, Cen A, Cyg X-1, and the 511-keV emission from the galactic center. Here I will present characteristics and capabilities of this novel instrument and preliminary results from the 2016 flight.