COSI is a balloon-borne soft gamma-ray (0.2-10 MeV) telescope designed to study astrophysical sources of nuclear line emission and gamma-ray polarization. NASA successfully launched this super pressure balloon (SPB) from Wanaka Airport, New Zealand, at 11:35 a.m. Tuesday, May 17, (7:35 p.m. EDT Monday, May 16) on a potentially record-breaking, around-the-world test flight.
See the video in Youtube: https://www.youtube.com/watch?v=BfvMS76whEU
Live trajectory: http://www.csbf.nasa.gov/newzealand/wanaka.htm
A post in the NASA-Wallops-Flight-Facility webpage: https://www.nasa.gov/centers/wallops/home
COSI official web-page: http://cosi.ssl.berkeley.edu