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GW170809 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW170809

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW170809

Both component-mass lower bounds exceed 3 solar masses

Primary mass34.1 M☉

Secondary mass24.2 M☉

ObservedAug 9, 2017

Event identity

Classification and release

ID: gwtc:GW170809
Event name: GW170809
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 9, 2017 at 8:28:21 AM UTC UTC
GPS time: 1,186,302,519.8

Source-frame posterior

Component and remnant masses

Primary mass: 34.1 (-5.3, +8) M☉
Secondary mass: 24.2 (-5.3, +4.8) M☉
Remnant mass: 55.7 (-3.6, +5) M☉
Effective spin: 0.07
Network SNR: 12.8

Propagation

Distance and statistical context

Luminosity distance: 1,070 (-380, +310) Mpc
Redshift: 0.21
Astrophysical probability: Not reported by GWOSC
False-alarm rate: Not reported by GWOSC

Provenance

Official source record

GWOSC · GWTC-2.1-confident

GW170809

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

JSON record GWOSC event page