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GW230927_043729 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230927_043729

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230927_043729

Both component-mass lower bounds exceed 3 solar masses

Primary mass35 M☉

Secondary mass27.1 M☉

ObservedSep 27, 2023

Event identity

Classification and release

ID: gwtc:GW230927_043729
Event name: GW230927_043729
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 27, 2023 at 4:37:29 AM UTC UTC
GPS time: 1,379,824,667.1

Source-frame posterior

Component and remnant masses

Primary mass: 35 (-6.2, +8.6) M☉
Secondary mass: 27.1 (-6.5, +7.3) M☉
Remnant mass: 59 (-7.8, +11.8) M☉
Effective spin: 0.01
Network SNR: 12.1

Propagation

Distance and statistical context

Luminosity distance: 3,200 (-1,700, +1,800) Mpc
Redshift: 0.55
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230927_043729

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

JSON record GWOSC event page