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GW190828_065509 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW190828_065509

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW190828_065509

Both component-mass lower bounds exceed 3 solar masses

Primary mass23.7 M☉

Secondary mass10.4 M☉

ObservedAug 28, 2019

Event identity

Classification and release

ID: gwtc:GW190828_065509
Event name: GW190828_065509
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-2.1-confident
Preferred event version: v2
Observed at: Wednesday, August 28, 2019 at 6:55:09 AM UTC UTC
GPS time: 1,251,010,527.8

Source-frame posterior

Component and remnant masses

Primary mass: 23.7 (-6.7, +6.8) M☉
Secondary mass: 10.4 (-2.2, +3.8) M☉
Remnant mass: 33 (-4.3, +5.3) M☉
Effective spin: 0.05
Network SNR: 10.2

Propagation

Distance and statistical context

Luminosity distance: 1,540 (-650, +690) Mpc
Redshift: 0.29
Astrophysical probability: 1
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-2.1-confident

GW190828_065509

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

JSON record GWOSC event page