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GW240109_050431 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW240109_050431

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW240109_050431

Both component-mass lower bounds exceed 3 solar masses

Primary mass28.7 M☉

Secondary mass18.1 M☉

ObservedJan 9, 2024

Event identity

Classification and release

ID: gwtc:GW240109_050431
Event name: GW240109_050431
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-4.1
Preferred event version: v2
Observed at: Tuesday, January 9, 2024 at 5:04:31 AM UTC UTC
GPS time: 1,388,811,889.8

Source-frame posterior

Component and remnant masses

Primary mass: 28.7 (-6.1, +7.5) M☉
Secondary mass: 18.1 (-4.1, +4.8) M☉
Remnant mass: 45.2 (-5.5, +6.4) M☉
Effective spin: -0.07
Network SNR: 10.4

Propagation

Distance and statistical context

Luminosity distance: 1,500 (-770, +1,020) Mpc
Redshift: 0.28
Astrophysical probability: 0.99
False-alarm rate: 0.0002

Provenance

Official source record

GWOSC · GWTC-4.1

GW240109_050431

Last synchronized 9/12/2026, 3:20:17 AM UTC.

JSON record GWOSC event page