An illustration showing some of the component masses of gravitational wave events that lie within or around the 3-5 solar mass region, also referred to as the "lower mass gap". The light blue circles represent sources that are neutron stars, the black circles represent sources that are black holes, and the black circles with question marks indicate that the source is likely a black hole, but there is also a possibility it could be a neutron star. The primary mass of GW230529 is located in this mass gap.

For a news story about GW230529, see www.ligo.caltech.edu/news/ligo20240405