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GW230704_021211 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230704_021211

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230704_021211

Both component-mass lower bounds exceed 3 solar masses

Primary mass32.6 M☉

Secondary mass20 M☉

ObservedJul 4, 2023

Event identity

Classification and release

ID: gwtc:GW230704_021211
Event name: GW230704_021211
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: Tuesday, July 4, 2023 at 2:12:11 AM UTC UTC
GPS time: 1,372,471,949.2

Source-frame posterior

Component and remnant masses

Primary mass: 32.6 (-8, +11.8) M☉
Secondary mass: 20 (-5.9, +6.6) M☉
Remnant mass: 50.7 (-7.9, +10.6) M☉
Effective spin: -0.01
Network SNR: 9.4

Propagation

Distance and statistical context

Luminosity distance: 2,700 (-1,500, +1,900) Mpc
Redshift: 0.47
Astrophysical probability: 0.99
False-alarm rate: 0.037

Provenance

Official source record

GWOSC · GWTC-4.1

GW230704_021211

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

JSON record GWOSC event page