It would have that effect if the energy was in the form of photons, but it is gravity waves.

If you release 5 solar masses of energy in one second, electromagnetically and with the same spectrum as the sun, half way between the Milky Way and Andromeda, every star in both galaxies would see it only a little dimmer as Sol appears on Mars.

https://www.wolframalpha.com/input/?i=%28%28%285+solar+mass%...