They've been observing gravitational waves between neutron stars for a while now, that's why I'm a little confused as to why this is a big deal. Now those were... I want to say low-frequency and these might be high frequency. I mean, there was a scientist who was getting mostly ignored who was trying to pitch the idea of a gravitational wave transmitter (it would allow us to map the core of the Earth without doubt or speculation).
Astrophysicists have accepted that gravitational waves happen out there, naturally all the time.
EDIT: I did a little more paper reading and this was a direct observation, kudos, Science!