LIGO: 2 Seconds behind the oscillating gravity signals, the Gamma burst came along. Is it by the difference in speed between both gravity photons and Gamma photons, as suggested ?
However, Q-FFF Theory says: NO according to Q-FFF Theory, it seems to be the Merging effect of the both Schwarzschield horizons ( the trapped surface) producing gamma rays by the annihilation of positrons and electrons. Also: Black Holes have NO mass, SO they do not rotate around each other, they wiggle short ( 0.5 sec) during the merging process.