The LIGO Scientific Collaboration has announced the second detection of gravitational waves that originated from the merging of two stellar mass black holes. The detection, GW151226, has been made on December 26, 2015 at 3:38:53 UTC. The article is published in the Physical Review Letters: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.241103. For the GT press release: http://www.news.gatech.edu/2016/06/15/gravitational-waves-detected-again.
For more information about this event see: https://www.ligo.caltech.edu/news/ligo20160615