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GW231129_081745 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231129_081745

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231129_081745

Both component-mass lower bounds exceed 3 solar masses

Primary mass45 M☉

Secondary mass23.8 M☉

ObservedNov 29, 2023

Event identity

Classification and release

ID: gwtc:GW231129_081745
Event name: GW231129_081745
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: Wednesday, November 29, 2023 at 8:17:45 AM UTC UTC
GPS time: 1,385,281,083.6

Source-frame posterior

Component and remnant masses

Primary mass: 45 (-13, +15) M☉
Secondary mass: 23.8 (-8.2, +10.3) M☉
Remnant mass: 66 (-14, +17) M☉
Effective spin: 0.03
Network SNR: 9.4

Propagation

Distance and statistical context

Luminosity distance: 3,800 (-2,100, +3,600) Mpc
Redshift: 0.62
Astrophysical probability: 0.99
False-alarm rate: 0.056

Provenance

Official source record

GWOSC · GWTC-4.1

GW231129_081745

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

JSON record GWOSC event page