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GW231029_111508 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231029_111508

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231029_111508

Both component-mass lower bounds exceed 3 solar masses

Primary mass65 M☉

Secondary mass42 M☉

ObservedOct 29, 2023

Event identity

Classification and release

ID: gwtc:GW231029_111508
Event name: GW231029_111508
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: Sunday, October 29, 2023 at 11:15:08 AM UTC UTC
GPS time: 1,382,613,326.8

Source-frame posterior

Component and remnant masses

Primary mass: 65 (-14, +18) M☉
Secondary mass: 42 (-15, +15) M☉
Remnant mass: 101 (-16, +21) M☉
Effective spin: 0.14
Network SNR: 10.8

Propagation

Distance and statistical context

Luminosity distance: 3,100 (-1,700, +2,400) Mpc
Redshift: 0.53
Astrophysical probability: 0.99
False-alarm rate: 0.0001

Provenance

Official source record

GWOSC · GWTC-4.1

GW231029_111508

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

JSON record GWOSC event page