LIGO scientist did it again! The signal was about 1 second long and they could see about 27 orbits of the two black holes before they merged. This was about 0.25s compared to the first detection.
Due to the many cycles, they could put a better measure of the spin of the black holes. Unfortunately from only one and measured a spin of '0.2'.
With this second detection LIGO is now 'observing' gravitational waves. Currently the machines are undergoing maintenance to improve the sensitivity by about two.
More details:
https://www.ligo.caltech.edu/news/ligo20160615
http://www.aciga.org.au/news/gw151226
PRL publication:
http://link.aps.org/doi/10.1103/PhysRevLett.116.241103