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GW240531_040326 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW240531_040326

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW240531_040326

Both component-mass lower bounds exceed 3 solar masses

Primary mass19.5 M☉

Secondary mass14.3 M☉

ObservedMay 31, 2024

Event identity

Classification and release

ID: gwtc:GW240531_040326
Event name: GW240531_040326
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-5.0
Preferred event version: v1
Observed at: Friday, May 31, 2024 at 4:03:26 AM UTC UTC
GPS time: 1,401,163,424.6

Source-frame posterior

Component and remnant masses

Primary mass: 19.5 (-3.7, +7.4) M☉
Secondary mass: 14.3 (-4.3, +3.5) M☉
Remnant mass: 32.3 (-4.1, +6.1) M☉
Effective spin: 0.14
Network SNR: 9.1

Propagation

Distance and statistical context

Luminosity distance: 3,000 (-1,500, +1,600) Mpc
Redshift: 0.52
Astrophysical probability: 0.95
False-alarm rate: 0.87

Provenance

Official source record

GWOSC · GWTC-5.0

GW240531_040326

Last synchronized 9/12/2026, 1:40:20 AM UTC.

JSON record GWOSC event page