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GW230820_212515 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230820_212515

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230820_212515

Both component-mass lower bounds exceed 3 solar masses

Primary mass62 M☉

Secondary mass34 M☉

ObservedAug 20, 2023

Event identity

Classification and release

ID: gwtc:GW230820_212515
Event name: GW230820_212515
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: Sunday, August 20, 2023 at 9:25:16 PM UTC UTC
GPS time: 1,376,601,934

Source-frame posterior

Component and remnant masses

Primary mass: 62 (-16, +23) M☉
Secondary mass: 34 (-18, +18) M☉
Remnant mass: 92 (-16, +20) M☉
Effective spin: 0.21
Network SNR: 9.3

Propagation

Distance and statistical context

Luminosity distance: 4,000 (-2,100, +3,000) Mpc
Redshift: 0.65
Astrophysical probability: 0.98
False-alarm rate: 0.24

Provenance

Official source record

GWOSC · GWTC-4.1

GW230820_212515

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

JSON record GWOSC event page