I didn't see these areas addressed, my apologies if I missed them. If there was no delay in the detection of the signals at the two sites, would that mean that the location of the event was 'directly overhead' or 'directly below'? Was the delay, compared to the speed of light and distance between the sites, indicative of the angle the the event was off center from a line connecting the two sites? Would a very small delay suggest a very wide angle over which the the event could have originated. Also, what can be inferred about the orientation of the plane of the two BHs as they approached each other, with respect to the earth? Was it a static plane as shown in the simulations, or one that had other rotational components with respect to the earth? Is visualizing it as a plane even accurate? If the rotation of the two BHs as they approached each other were in fact in a plane and we were looking at the rotational plane from 'directly above' rather than on edge, how would that affect the amplitude of the GW? Would we see it at all? Would either of the sites be able to detect an event from a plane 'parallel' to the plane of the site? or an event in the same plane as the mirror(s)? One last question, how does the fact that the two sites are presumably not oriented in the same plane (curvature of the earth) impact the observations?