Okay guys, from what I've been reading lately, there's NO REASON why a gravity wave cannot be faster than light. As a matter of fact, that seems to be the norm.
A new Electrostatic antenna also shows Faster Than Light capability. http://www.wbabin.net/erdmann/erdmann.htm
(Be sure to look at their experimental verification of FTL transmission. Very interesting experiment that is easily reproduced.)
Tesla wrote about the superluminal velocities of longitudinal waves when he DISCOVERED them.
The Hodowanec "Gravity Wave Detector" circuit detected gravity waves which correspond with the solstice event, but arrive exactly 8.3 minutes ahead of the observed visual event. In other words, gravity travled at near REALTIME compared to light.
An excellent article on observed FTL phenomenon here: http://home.gwi.net/~erichard/fastlit.htm
Several Scalar detector designs reveiwed here http://www.amasci.com/freenrg/bark.html
After looking at the links above, I don't think you'll have a such a hard time with a gravitational pulse arriving ahead of it's corresponding Gamma pulse. The antenna experiment alone is enough to call "light speed" into question as the absolute maximum universal speed limit.
:')