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GW230911_195324 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230911_195324

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230911_195324

Both component-mass lower bounds exceed 3 solar masses

Primary mass33.9 M☉

Secondary mass21.6 M☉

ObservedSep 11, 2023

Event identity

Classification and release

ID: gwtc:GW230911_195324
Event name: GW230911_195324
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, September 11, 2023 at 7:53:24 PM UTC UTC
GPS time: 1,378,497,222.2

Source-frame posterior

Component and remnant masses

Primary mass: 33.9 (-7.2, +8.2) M☉
Secondary mass: 21.6 (-5.6, +5.7) M☉
Remnant mass: 53.1 (-6.8, +7.5) M☉
Effective spin: -0.02
Network SNR: 11.1

Propagation

Distance and statistical context

Luminosity distance: 1,350 (-710, +1,170) Mpc
Redshift: 0.26
Astrophysical probability: 0.99
False-alarm rate: 0.001

Provenance

Official source record

GWOSC · GWTC-4.1

GW230911_195324

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

JSON record GWOSC event page