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GW190731_140936 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW190731_140936

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW190731_140936

Both component-mass lower bounds exceed 3 solar masses

Primary mass41.8 M☉

Secondary mass29 M☉

ObservedJul 31, 2019

Event identity

Classification and release

ID: gwtc:GW190731_140936
Event name: GW190731_140936
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, July 31, 2019 at 2:09:36 PM UTC UTC
GPS time: 1,248,617,394.6

Source-frame posterior

Component and remnant masses

Primary mass: 41.8 (-9.1, +12.7) M☉
Secondary mass: 29 (-9.9, +10.2) M☉
Remnant mass: 67.4 (-10.8, +15.3) M☉
Effective spin: 0.07
Network SNR: 8.8

Propagation

Distance and statistical context

Luminosity distance: 3,330 (-1,770, +2,350) Mpc
Redshift: 0.56
Astrophysical probability: 0.8343
False-alarm rate: 0.33

Provenance

Official source record

GWOSC · GWTC-2.1-confident

GW190731_140936

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

JSON record GWOSC event page