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GW230609_064958 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230609_064958

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230609_064958

Both component-mass lower bounds exceed 3 solar masses

Primary mass35.4 M☉

Secondary mass25.2 M☉

ObservedJun 9, 2023

Event identity

Classification and release

ID: gwtc:GW230609_064958
Event name: GW230609_064958
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: Friday, June 9, 2023 at 6:49:58 AM UTC UTC
GPS time: 1,370,328,616.3

Source-frame posterior

Component and remnant masses

Primary mass: 35.4 (-7, +10.7) M☉
Secondary mass: 25.2 (-7.4, +7.6) M☉
Remnant mass: 58 (-7.9, +12.1) M☉
Effective spin: -0.14
Network SNR: 10.6

Propagation

Distance and statistical context

Luminosity distance: 3,400 (-1,800, +1,900) Mpc
Redshift: 0.56
Astrophysical probability: 0.99
False-alarm rate: 0.0001

Provenance

Official source record

GWOSC · GWTC-4.1

GW230609_064958

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

JSON record GWOSC event page