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GW190503_185404 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW190503_185404

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW190503_185404

Both component-mass lower bounds exceed 3 solar masses

Primary mass41.3 M☉

Secondary mass28.3 M☉

ObservedMay 3, 2019

Event identity

Classification and release

ID: gwtc:GW190503_185404
Event name: GW190503_185404
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: Friday, May 3, 2019 at 6:54:04 PM UTC UTC
GPS time: 1,240,944,862.2

Source-frame posterior

Component and remnant masses

Primary mass: 41.3 (-7.7, +10.3) M☉
Secondary mass: 28.3 (-9.2, +7.5) M☉
Remnant mass: 66.5 (-7.9, +9.4) M☉
Effective spin: -0.05
Network SNR: 12.2

Propagation

Distance and statistical context

Luminosity distance: 1,520 (-600, +630) Mpc
Redshift: 0.29
Astrophysical probability: 1
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-2.1-confident

GW190503_185404

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

JSON record GWOSC event page