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GW231223_075055 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231223_075055

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231223_075055

Both component-mass lower bounds exceed 3 solar masses

Primary mass11.9 M☉

Secondary mass6.8 M☉

ObservedDec 23, 2023

Event identity

Classification and release

ID: gwtc:GW231223_075055
Event name: GW231223_075055
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 7:50:55 AM UTC UTC
GPS time: 1,387,353,073.3

Source-frame posterior

Component and remnant masses

Primary mass: 11.9 (-2.8, +7) M☉
Secondary mass: 6.8 (-2.2, +2) M☉
Remnant mass: 18.1 (-1.9, +4.9) M☉
Effective spin: 0.07
Network SNR: 9.4

Propagation

Distance and statistical context

Luminosity distance: 970 (-430, +580) Mpc
Redshift: 0.19
Astrophysical probability: 0.98
False-alarm rate: 0.23

Provenance

Official source record

GWOSC · GWTC-4.1

GW231223_075055

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

JSON record GWOSC event page