I understand that LIGO can detect something, but how do they know where it came from? How can they register a disturbance in the spectra to a a source? Do they really quickly point a ccd at the sky and hope they captured what happened?
To get data, a CMB telescope is scanned across the sky for several months (or years), and the raw time signals are converted into a map of the microwave sky.
LIGO is an entirely different category of scientific instrument; it is looking for the direct influence of present-day gravitational waves on the motion of terrestrial masses.
In parallel, people are also going forward with development for LISA. It had to be scaled back a bit because NASA decided to pull out, but it's still going.
I think that they can point the source because the effects they detected means it could have only come from one place.