A flash of X-rays was discovered by NASA’s Chandra X-ray Observatory, and is the deepest X-ray image ever obtained. The flash was located in the Chandra Deep Field-South (CDF-S) region of the sky, which was determined to be from a small, faint galaxy 10.7 billion light years away.The flash is believed to be caused by some sort of destructive event, though the cause is still unknown.
There are some theories that partially explain the explosion. Two explanations point to Gamma Ray Bursts (GRBs), which may have been caused by the collapse of a giant star or by neutron star merging with either another neutron star or a black hole. The third possibility is a medium-sized black hole tearing apart a white dwarf. The problem with these explanations is that there would have also been gravitational waves detected, but there were none.
This X-ray source in the CDF-S is similar to other unexplained variable x-ray sources, which are being compiled into greater data in order to explain these occurrences. All together this could mean that a completely new type of cataclysmic event has been observed.