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GW230811_032116 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230811_032116

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230811_032116

Both component-mass lower bounds exceed 3 solar masses

Primary mass35.4 M☉

Secondary mass22.3 M☉

ObservedAug 11, 2023

Event identity

Classification and release

ID: gwtc:GW230811_032116
Event name: GW230811_032116
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: Friday, August 11, 2023 at 3:21:16 AM UTC UTC
GPS time: 1,375,759,294.3

Source-frame posterior

Component and remnant masses

Primary mass: 35.4 (-7.3, +8.6) M☉
Secondary mass: 22.3 (-5.2, +6.7) M☉
Remnant mass: 55.3 (-6.5, +8.4) M☉
Effective spin: 0.03
Network SNR: 13.6

Propagation

Distance and statistical context

Luminosity distance: 2,100 (-1,100, +1,200) Mpc
Redshift: 0.38
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230811_032116

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

JSON record GWOSC event page