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GW250109_010541 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW250109_010541

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW250109_010541

Both component-mass lower bounds exceed 3 solar masses

Primary mass37.5 M☉

Secondary mass27.4 M☉

ObservedJan 9, 2025

Event identity

Classification and release

ID: gwtc:GW250109_010541
Event name: GW250109_010541
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: Thursday, January 9, 2025 at 1:05:41 AM UTC UTC
GPS time: 1,420,419,959.5

Source-frame posterior

Component and remnant masses

Primary mass: 37.5 (-7.1, +14.7) M☉
Secondary mass: 27.4 (-8.9, +8) M☉
Remnant mass: 62.2 (-8.2, +14) M☉
Effective spin: -0.11
Network SNR: 13.1

Propagation

Distance and statistical context

Luminosity distance: 3,400 (-1,700, +1,700) Mpc
Redshift: 0.56
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-5.0

GW250109_010541

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

JSON record GWOSC event page