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GW230729_082317 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230729_082317

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230729_082317

Both component-mass lower bounds exceed 3 solar masses

Primary mass12.3 M☉

Secondary mass7.6 M☉

ObservedJul 29, 2023

Event identity

Classification and release

ID: gwtc:GW230729_082317
Event name: GW230729_082317
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: Saturday, July 29, 2023 at 8:23:17 AM UTC UTC
GPS time: 1,374,654,215.2

Source-frame posterior

Component and remnant masses

Primary mass: 12.3 (-2.7, +7.6) M☉
Secondary mass: 7.6 (-2.6, +2.1) M☉
Remnant mass: 19.3 (-2.3, +5.1) M☉
Effective spin: 0.12
Network SNR: 9.5

Propagation

Distance and statistical context

Luminosity distance: 1,640 (-770, +820) Mpc
Redshift: 0.31
Astrophysical probability: 0.98
False-alarm rate: 0.17

Provenance

Official source record

GWOSC · GWTC-4.1

GW230729_082317

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

JSON record GWOSC event page