They didn't waste any time getting a wiki page up:
https://en.wikipedia.org/wiki/Gravitational_wave_observation Fun quote:
"Analysis of the signal along with the inferred redshift suggested that it was produced
by the merger of two black holes with masses of 36 +5/-4 times and 294 times the mass of
the Sun, resulting in a post-merger black hole of 624 solar masses. The missing 3.00.5
solar masses of energy was radiated away in the form of gravitational waves, in accordance
with massenergy equivalence. The peak radiated gravitational wave power of about 3.610^49
watts was over ten times more than the combined light power radiated by all the stars in the
observable universe,[2][12][n 1] or 0.1% of the Planck power."
So the output was equivalent to annihilating 1.5 solar masses with
an antimatter equivalent, except the energy all went to gravitational
waves rather than electromagnetic. Must have been interesting for
anything in the near vicinity (where near is a few light years)...