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Black Holes/Gravitational-wave mergers/GW231123_135430

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231123_135430

Both component-mass lower bounds exceed 3 solar masses

Primary mass137 M☉

Secondary mass101 M☉

ObservedNov 23, 2023

Event identity

Classification and release

ID: gwtc:GW231123_135430
Event name: GW231123_135430
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: v3
Observed at: Thursday, November 23, 2023 at 1:54:30 PM UTC UTC
GPS time: 1,384,782,888.7

Source-frame posterior

Component and remnant masses

Primary mass: 137 (-18, +23) M☉
Secondary mass: 101 (-50, +22) M☉
Remnant mass: 222 (-42, +28) M☉
Effective spin: 0.32
Network SNR: 21.8

Propagation

Distance and statistical context

Luminosity distance: 2,200 (-1,500, +1,900) Mpc
Redshift: 0.4
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW231123_135430

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

JSON record GWOSC event page

GW231123_135430 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda