"On 8:41 am EDT August 17, 2017, LIGO detected a new gravitational wave source, dubbed GW170817 to mark its discovery date. Just two seconds later NASA's Fermi satellite detected a weak pulse of gamma rays from the same location of the sky." https://www.cfa.harvard.edu/news/2017-30

"Just two seconds later" and "the same location of the sky" implies that gravitational waves and gamma rays traveled hand in hand: same gravitationally deflected path, same speed, same Shapiro delay, equally blocked by cosmic matter. Unrealistic, isn't it?

The last implication is particularly idiotic. If at some point in space gamma rays are absorbed and don't reach us, the accompanying gravitational waves don't reach us either. Apotheosis of post-truth (post-sanity) science.

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Pentcho Valev