PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Gamma-Ray Astronomy. GA-instrumentation
The Compton Spectrometer and Imager (COSI)
J.L. Chiu,* S. E. Boggs, C. A. Kierans, A. Lowell, C. Sleator, J. A. Tomsick, A. Zoglauer, M. Amman, H.K. Chang, C.Y. Chu, C.H. Tseng, C.Y. Yang, C.h. Lin, P. Jean, P. von Ballmoos
*corresponding author
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
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 the capability of tracking the photon scattering history with full 3D position resolution of less than 2 $mm^{3}$ for each interaction. With good efficiency, wide-field imaging, and polarization sensitivity, COSI is a powerful observatory in the medium gamma-ray regime. 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 GRB 160530A and detected several sources, including the Crab, Cen A, Cyg X-1, and the 511-keV emission from the galactic center. Here we will present the characteristics and capabilities of this novel instrument and preliminary results from the 2016 flight.
DOI: https://doi.org/10.22323/1.301.0796
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