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GW230708_053705 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230708_053705

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230708_053705

Both component-mass lower bounds exceed 3 solar masses

Primary mass29.1 M☉

Secondary mass22.7 M☉

ObservedJul 8, 2023

Event identity

Classification and release

ID: gwtc:GW230708_053705
Event name: GW230708_053705
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: Saturday, July 8, 2023 at 5:37:05 AM UTC UTC
GPS time: 1,372,829,843.1

Source-frame posterior

Component and remnant masses

Primary mass: 29.1 (-5.4, +8.2) M☉
Secondary mass: 22.7 (-5.3, +5.6) M☉
Remnant mass: 49.4 (-7.3, +9.6) M☉
Effective spin: 0.06
Network SNR: 8.9

Propagation

Distance and statistical context

Luminosity distance: 3,300 (-1,700, +2,100) Mpc
Redshift: 0.55
Astrophysical probability: 0.99
False-alarm rate: 0.028

Provenance

Official source record

GWOSC · GWTC-4.1

GW230708_053705

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

JSON record GWOSC event page