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ALT The front cover of LIGO Magazine issue 24. The main image shows a snowy scene at the LIGO Hanford Observatory looking along the beam tube, which stretches to the horizon (credit Corey Gray). The top inset image shows a artistic representation of a binary black hole system (credit Laurence Datrier). The bottom inset image shows an illustration of cosmology with gravitational waves (credit: Storm Colloms). The bottom-left diagonal inset shows a photo of a LISA test mass cube (credit: ESA, CC BY-SA 3.0).

ALT The image shows a flow chart for a gravitational wave candidate in observing run 4 and the processes followed by the LIGO-Virgo-KAGRA Rapid Response Team. The signals go through many checks to determine if they are significant observations. E.g. what was is the false alarm rate for the signal, and how likely is it that the signal has an electromagnetic counterpart. The most High Profile gravitational wave signals are those that might also produce electromagnetic light. These signals are possible multi-messenger events which are of interest to electromagnetic astronomers to follow up with other facilities and telescopes around the world. Credit: Storm Colloms.