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GW250118_170523 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW250118_170523

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW250118_170523

Both component-mass lower bounds exceed 3 solar masses

Primary mass38.1 M☉

Secondary mass29.6 M☉

ObservedJan 18, 2025

Event identity

Classification and release

ID: gwtc:GW250118_170523
Event name: GW250118_170523
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 5:05:23 PM UTC UTC
GPS time: 1,421,255,141.2

Source-frame posterior

Component and remnant masses

Primary mass: 38.1 (-5.6, +8.1) M☉
Secondary mass: 29.6 (-6.3, +5.4) M☉
Remnant mass: 64.4 (-6.2, +7.3) M☉
Effective spin: 0.12
Network SNR: 13.9

Propagation

Distance and statistical context

Luminosity distance: 1,910 (-740, +800) Mpc
Redshift: 0.35
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-5.0

GW250118_170523

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

JSON record GWOSC event page