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GW231226_101520 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231226_101520

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231226_101520

Both component-mass lower bounds exceed 3 solar masses

Primary mass40.2 M☉

Secondary mass35.1 M☉

ObservedDec 26, 2023

Event identity

Classification and release

ID: gwtc:GW231226_101520
Event name: GW231226_101520
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: Tuesday, December 26, 2023 at 10:15:20 AM UTC UTC
GPS time: 1,387,620,938.3

Source-frame posterior

Component and remnant masses

Primary mass: 40.2 (-2.9, +4.4) M☉
Secondary mass: 35.1 (-4.9, +3.2) M☉
Remnant mass: 71.6 (-2.8, +3.7) M☉
Effective spin: -0.08
Network SNR: 34.7

Propagation

Distance and statistical context

Luminosity distance: 1,180 (-360, +240) Mpc
Redshift: 0.23
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW231226_101520

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

JSON record GWOSC event page