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GW250108_152221 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW250108_152221

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW250108_152221

Both component-mass lower bounds exceed 3 solar masses

Primary mass54 M☉

Secondary mass36 M☉

ObservedJan 8, 2025

Event identity

Classification and release

ID: gwtc:GW250108_152221
Event name: GW250108_152221
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: Wednesday, January 8, 2025 at 3:22:21 PM UTC UTC
GPS time: 1,420,384,959.7

Source-frame posterior

Component and remnant masses

Primary mass: 54 (-12, +15) M☉
Secondary mass: 36 (-10, +10) M☉
Remnant mass: 86 (-12, +17) M☉
Effective spin: 0.05
Network SNR: 11.8

Propagation

Distance and statistical context

Luminosity distance: 3,800 (-1,900, +2,400) Mpc
Redshift: 0.63
Astrophysical probability: 0.99
False-alarm rate: 0.0002

Provenance

Official source record

GWOSC · GWTC-5.0

GW250108_152221

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

JSON record GWOSC event page