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GW240420_175625 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW240420_175625

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW240420_175625

Both component-mass lower bounds exceed 3 solar masses

Primary mass34.6 M☉

Secondary mass23.8 M☉

ObservedApr 20, 2024

Event identity

Classification and release

ID: gwtc:GW240420_175625
Event name: GW240420_175625
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: Saturday, April 20, 2024 at 5:56:25 PM UTC UTC
GPS time: 1,397,671,003.5

Source-frame posterior

Component and remnant masses

Primary mass: 34.6 (-7.2, +10) M☉
Secondary mass: 23.8 (-7.1, +7.2) M☉
Remnant mass: 56 (-8.3, +9.8) M☉
Effective spin: Not reported by GWOSC
Network SNR: 10

Propagation

Distance and statistical context

Luminosity distance: 2,000 (-1,100, +1,600) Mpc
Redshift: 0.37
Astrophysical probability: 0.98
False-alarm rate: 0.078

Provenance

Official source record

GWOSC · GWTC-5.0

GW240420_175625

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

JSON record GWOSC event page