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GW231005_091549 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231005_091549

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231005_091549

Both component-mass lower bounds exceed 3 solar masses

Primary mass28.8 M☉

Secondary mass21.2 M☉

ObservedOct 5, 2023

Event identity

Classification and release

ID: gwtc:GW231005_091549
Event name: GW231005_091549
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: Thursday, October 5, 2023 at 9:15:49 AM UTC UTC
GPS time: 1,380,532,567.5

Source-frame posterior

Component and remnant masses

Primary mass: 28.8 (-6.1, +10.1) M☉
Secondary mass: 21.2 (-6.2, +6.3) M☉
Remnant mass: 48 (-7.9, +10.8) M☉
Effective spin: -0.03
Network SNR: 11

Propagation

Distance and statistical context

Luminosity distance: 3,800 (-1,900, +2,500) Mpc
Redshift: 0.62
Astrophysical probability: 0.99
False-alarm rate: 0.04

Provenance

Official source record

GWOSC · GWTC-4.1

GW231005_091549

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

JSON record GWOSC event page