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GW231020_142947 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231020_142947

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231020_142947

Both component-mass lower bounds exceed 3 solar masses

Primary mass12 M☉

Secondary mass7.4 M☉

ObservedOct 20, 2023

Event identity

Classification and release

ID: gwtc:GW231020_142947
Event name: GW231020_142947
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: Friday, October 20, 2023 at 2:29:47 PM UTC UTC
GPS time: 1,381,847,405.6

Source-frame posterior

Component and remnant masses

Primary mass: 12 (-2.6, +8.4) M☉
Secondary mass: 7.4 (-2.8, +2) M☉
Remnant mass: 18.8 (-2, +5.6) M☉
Effective spin: 0.14
Network SNR: 12

Propagation

Distance and statistical context

Luminosity distance: 1,230 (-640, +510) Mpc
Redshift: 0.24
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW231020_142947

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

JSON record GWOSC event page