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GW250118_055802 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW250118_055802

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW250118_055802

Both component-mass lower bounds exceed 3 solar masses

Primary mass10.3 M☉

Secondary mass6.9 M☉

ObservedJan 18, 2025

Event identity

Classification and release

ID: gwtc:GW250118_055802
Event name: GW250118_055802
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: Saturday, January 18, 2025 at 5:58:02 AM UTC UTC
GPS time: 1,421,215,100.5

Source-frame posterior

Component and remnant masses

Primary mass: 10.3 (-1.8, +7.5) M☉
Secondary mass: 6.9 (-2.6, +1.5) M☉
Remnant mass: 16.6 (-1.5, +4.9) M☉
Effective spin: 0.11
Network SNR: 10.5

Propagation

Distance and statistical context

Luminosity distance: 940 (-380, +630) Mpc
Redshift: 0.19
Astrophysical probability: 0.99
False-alarm rate: 0.0089

Provenance

Official source record

GWOSC · GWTC-5.0

GW250118_055802

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

JSON record GWOSC event page