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GW231026_130704 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231026_130704

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231026_130704

Both component-mass lower bounds exceed 3 solar masses

Primary mass34 M☉

Secondary mass20.8 M☉

ObservedOct 26, 2023

Event identity

Classification and release

ID: gwtc:GW231026_130704
Event name: GW231026_130704
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: Thursday, October 26, 2023 at 1:07:04 PM UTC UTC
GPS time: 1,382,360,842.2

Source-frame posterior

Component and remnant masses

Primary mass: 34 (-11, +27) M☉
Secondary mass: 20.8 (-8.2, +9.8) M☉
Remnant mass: 53 (-13, +28) M☉
Effective spin: 0.03
Network SNR: 8.3

Propagation

Distance and statistical context

Luminosity distance: 4,400 (-2,400, +4,000) Mpc
Redshift: 0.71
Astrophysical probability: 0.95
False-alarm rate: 0.76

Provenance

Official source record

GWOSC · GWTC-4.1

GW231026_130704

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

JSON record GWOSC event page