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GW230731_215307 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230731_215307

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230731_215307

Both component-mass lower bounds exceed 3 solar masses

Primary mass10.3 M☉

Secondary mass7.9 M☉

ObservedJul 31, 2023

Event identity

Classification and release

ID: gwtc:GW230731_215307
Event name: GW230731_215307
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: Monday, July 31, 2023 at 9:53:07 PM UTC UTC
GPS time: 1,374,875,605.9

Source-frame posterior

Component and remnant masses

Primary mass: 10.3 (-1.3, +2.8) M☉
Secondary mass: 7.9 (-1.7, +1.2) M☉
Remnant mass: 17.4 (-1, +1.6) M☉
Effective spin: -0.05
Network SNR: 12.2

Propagation

Distance and statistical context

Luminosity distance: 1,100 (-460, +350) Mpc
Redshift: 0.22
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230731_215307

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

JSON record GWOSC event page