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GW230919_215712 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230919_215712

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230919_215712

Both component-mass lower bounds exceed 3 solar masses

Primary mass27.3 M☉

Secondary mass21.4 M☉

ObservedSep 19, 2023

Event identity

Classification and release

ID: gwtc:GW230919_215712
Event name: GW230919_215712
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: Tuesday, September 19, 2023 at 9:57:12 PM UTC UTC
GPS time: 1,379,195,850

Source-frame posterior

Component and remnant masses

Primary mass: 27.3 (-3.7, +5.5) M☉
Secondary mass: 21.4 (-4.2, +3.5) M☉
Remnant mass: 46.5 (-4.3, +4) M☉
Effective spin: 0.18
Network SNR: 16.8

Propagation

Distance and statistical context

Luminosity distance: 1,330 (-510, +790) Mpc
Redshift: 0.25
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230919_215712

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

JSON record GWOSC event page