[This is the fourth announced detection of a binary black hole system](https://www.ligo.caltech.edu/news/ligo20170927) and the first to show the scientific potential of a three-detector network of gravitational-wave detectors. [cWB was used to confirm its significance](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.141101) Note: In order to generate a skymap over the full sky area, this CED has been produced by setting the netCC=0.