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GW231108_125142 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231108_125142

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231108_125142

Both component-mass lower bounds exceed 3 solar masses

Primary mass23.2 M☉

Secondary mass17.4 M☉

ObservedNov 8, 2023

Event identity

Classification and release

ID: gwtc:GW231108_125142
Event name: GW231108_125142
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 8, 2023 at 12:51:42 PM UTC UTC
GPS time: 1,383,483,120.5

Source-frame posterior

Component and remnant masses

Primary mass: 23.2 (-3.6, +5.5) M☉
Secondary mass: 17.4 (-3.2, +3.2) M☉
Remnant mass: 38.9 (-3.2, +4.9) M☉
Effective spin: -0.08
Network SNR: 12.6

Propagation

Distance and statistical context

Luminosity distance: 2,050 (-890, +750) Mpc
Redshift: 0.37
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW231108_125142

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

JSON record GWOSC event page