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GW231221_135041 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW231221_135041

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW231221_135041

Both component-mass lower bounds exceed 3 solar masses

Primary mass47 M☉

Secondary mass29 M☉

ObservedDec 21, 2023

Event identity

Classification and release

ID: gwtc:GW231221_135041
Event name: GW231221_135041
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: Thursday, December 21, 2023 at 1:50:41 PM UTC UTC
GPS time: 1,387,201,859.3

Source-frame posterior

Component and remnant masses

Primary mass: 47 (-13, +22) M☉
Secondary mass: 29 (-13, +12) M☉
Remnant mass: 73 (-15, +21) M☉
Effective spin: 0.01
Network SNR: 10

Propagation

Distance and statistical context

Luminosity distance: 4,600 (-2,500, +3,800) Mpc
Redshift: 0.72
Astrophysical probability: 0.96
False-alarm rate: 0.54

Provenance

Official source record

GWOSC · GWTC-4.1

GW231221_135041

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

JSON record GWOSC event page