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GW230920_071124 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230920_071124

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230920_071124

Both component-mass lower bounds exceed 3 solar masses

Primary mass32.4 M☉

Secondary mass23.8 M☉

ObservedSep 20, 2023

Event identity

Classification and release

ID: gwtc:GW230920_071124
Event name: GW230920_071124
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, September 20, 2023 at 7:11:24 AM UTC UTC
GPS time: 1,379,229,102.7

Source-frame posterior

Component and remnant masses

Primary mass: 32.4 (-6.2, +9.1) M☉
Secondary mass: 23.8 (-6.8, +6.6) M☉
Remnant mass: 53.8 (-7.6, +9.6) M☉
Effective spin: Not reported by GWOSC
Network SNR: 11.1

Propagation

Distance and statistical context

Luminosity distance: 2,900 (-1,400, +1,800) Mpc
Redshift: 0.49
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230920_071124

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

JSON record GWOSC event page