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GW240428_225440 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW240428_225440

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW240428_225440

Both component-mass lower bounds exceed 3 solar masses

Primary mass19.8 M☉

Secondary mass14.7 M☉

ObservedApr 28, 2024

Event identity

Classification and release

ID: gwtc:GW240428_225440
Event name: GW240428_225440
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-5.0
Preferred event version: v1
Observed at: Sunday, April 28, 2024 at 10:54:40 PM UTC UTC
GPS time: 1,398,380,098.1

Source-frame posterior

Component and remnant masses

Primary mass: 19.8 (-2.6, +4.9) M☉
Secondary mass: 14.7 (-2.9, +2.2) M☉
Remnant mass: 33 (-1.4, +2.3) M☉
Effective spin: 0.03
Network SNR: 15.6

Propagation

Distance and statistical context

Luminosity distance: 840 (-280, +200) Mpc
Redshift: 0.17
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-5.0

GW240428_225440

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

JSON record GWOSC event page