Gravitational Wave: GW231123, the biggest GW to date!

GW231123 apparently involved the merger of a black hole a 103 times the mass of the Sun with one 137 solar masses to create a giant of 225 solar masses. The missing estimated 15 solar masses was converted into energy, including the gravitational wave that alerted us to the event. The distance to the event is quite uncertain, anything from 700 million to 4.1 billion light years. Currently presented at GR–Amaldi Meeting held 14-18 July 2025, Glasglow.