We detected a third binary black hole merger with the LIGO gravitational wave detectors. The black holes merged about 3 billion years ago and travelled through earth on 4 January 2017.

The detection is published in Physical Review Letters, a science summary can be found on the LIGO website. Members of the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) are part of the LIGO Scientific Collaboration.

• ANU news article 
• PRL publication
• Summary
• LIGO Scientific Collaboration
• OzGrav