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GW231223_202619 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231223_202619

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231223_202619

Both component-mass lower bounds exceed 3 solar masses

Primary mass11.1 M☉

Secondary mass8.3 M☉

ObservedDec 23, 2023

Event identity

Classification and release

ID: gwtc:GW231223_202619
Event name: GW231223_202619
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: Saturday, December 23, 2023 at 8:26:19 PM UTC UTC
GPS time: 1,387,398,397

Source-frame posterior

Component and remnant masses

Primary mass: 11.1 (-1.6, +3.9) M☉
Secondary mass: 8.3 (-2, +1.4) M☉
Remnant mass: 18.7 (-1.5, +2.3) M☉
Effective spin: 0.1
Network SNR: 10.1

Propagation

Distance and statistical context

Luminosity distance: 890 (-440, +480) Mpc
Redshift: 0.18
Astrophysical probability: 0.99
False-alarm rate: 0.002

Provenance

Official source record

GWOSC · GWTC-4.1

GW231223_202619

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

JSON record GWOSC event page