Question

where do short gamma - ray bursts come from?

Explanation:

Short gamma - ray bursts are thought to be produced by the merger of two compact objects such as neutron - star pairs or a neutron - star and a black - hole. These mergers release an enormous amount of energy in the form of gamma - rays.

Answer:

They are likely from the merger of compact objects like neutron - star pairs or a neutron - star and a black - hole.