Gamma rays are gravitationally deflected or blocked by cosmic matter. Gravitational waves are not, Einsteinians teach. Therefore, gamma rays and gravitational waves CANNOT arrive "from the same location of the sky", almost simultaneously:

"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

LIGO's "discoveries" are obviously fake.

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Pentcho Valev