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GW231231_154016 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231231_154016

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231231_154016

Both component-mass lower bounds exceed 3 solar masses

Primary mass22.5 M☉

Secondary mass17.2 M☉

ObservedDec 31, 2023

Event identity

Classification and release

ID: gwtc:GW231231_154016
Event name: GW231231_154016
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-4.1
Preferred event version: v2
Observed at: Sunday, December 31, 2023 at 3:40:16 PM UTC UTC
GPS time: 1,388,072,434.7

Source-frame posterior

Component and remnant masses

Primary mass: 22.5 (-3.2, +5.5) M☉
Secondary mass: 17.2 (-3.2, +2.9) M☉
Remnant mass: 38.1 (-3.3, +4) M☉
Effective spin: -0.03
Network SNR: 13.4

Propagation

Distance and statistical context

Luminosity distance: 1,070 (-530, +590) Mpc
Redshift: 0.21
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW231231_154016

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

JSON record GWOSC event page