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" ... But not, perhaps, from all neutron star mergers; perhaps it’s only the ones that don’t immediately form a black hole. Either ejected material or reactions in the neutron star’s interior is required to produce these elements, and hence, the light associated with a kilonova explosion. That light is only produced after the gravitational wave signal has ended, and may further be delayed by having to pass through the circumstellar material. This is why, even though light and gravity both travel exactly at the speed of light in a vacuum, the light we saw didn’t arrive until nearly 2 seconds after the gravitational wave signal ceased. As we collect and observe more of these events, we’ll be able to confirm and refine this picture once and for all! ... "
" ... The reason? For the first merger, the masses of the initial two neutron stars were relatively low, and the post-merger object they produced was initially a neutron star. Spinning rapidly, it formed an event horizon and collapsed into a black hole in less than a second, but that was enough time for light and matter to get out in copious amounts, producing a special type of explosion known as a kilonova. ... "
" ... There's another piece of evidence, too. The kilonova event of 2017, where we observed the merging of two neutron stars in both gravitational waves and in electromagnetic light, had these two signals arrive nearly simultaneously: with less than a 2.0 second difference between them. Traveling from a distance of over 100 million light years (and given that there are over 30 million seconds in a year), we can state that the speed of light and the speed of gravity are equal to within better than 1 part in a quadrillion (1015). ... "