I do enjoy weird astronomical phenomena. We certainly see plenty of unexpected things whenever we get a new look at a planet, and odd phenomena sure don’t seem rare. I don’t know much about gravity waves, but this article says:
On Jan. 14, astronomers detected a split-second burst of gravitational waves, distortions in space-time … but researchers don’t know where this burst came from. … Gravitational waves can be caused by the collision of massive objects, such as two black holes or two neutron stars. Astronomers detected such gravitational waves from a neutron star collision in 2017 and from one in April of 2019 … But gravitational waves from collisions of such massive objects typically last longer and manifest in the data as a series of waves that change in frequency over time as the two orbiting objects move closer to each other.
I think this was obviously some alien species using wormhole technology relatively near Earth. Wormhole opens and shuts nearly instantaneously, and there you go, a split-second burst of distortions in space-time.
Keep an eye out for flying saucers this week!