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GW231018_233037 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231018_233037

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231018_233037

Both component-mass lower bounds exceed 3 solar masses

Primary mass11.6 M☉

Secondary mass7.3 M☉

ObservedOct 18, 2023

Event identity

Classification and release

ID: gwtc:GW231018_233037
Event name: GW231018_233037
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, October 18, 2023 at 11:30:37 PM UTC UTC
GPS time: 1,381,707,055

Source-frame posterior

Component and remnant masses

Primary mass: 11.6 (-2.4, +5.1) M☉
Secondary mass: 7.3 (-2.1, +1.9) M☉
Remnant mass: 18.2 (-1.9, +3.5) M☉
Effective spin: 0.01
Network SNR: 9.1

Propagation

Distance and statistical context

Luminosity distance: 1,540 (-740, +740) Mpc
Redshift: 0.29
Astrophysical probability: 0.93
False-alarm rate: 0.68

Provenance

Official source record

GWOSC · GWTC-4.1

GW231018_233037

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

JSON record GWOSC event page