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GW230928_215827 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230928_215827

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230928_215827

Both component-mass lower bounds exceed 3 solar masses

Primary mass54 M☉

Secondary mass29 M☉

ObservedSep 28, 2023

Event identity

Classification and release

ID: gwtc:GW230928_215827
Event name: GW230928_215827
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, September 28, 2023 at 9:58:27 PM UTC UTC
GPS time: 1,379,973,525.1

Source-frame posterior

Component and remnant masses

Primary mass: 54 (-16, +19) M☉
Secondary mass: 29 (-11, +13) M☉
Remnant mass: 79 (-17, +21) M☉
Effective spin: 0.4
Network SNR: 10.5

Propagation

Distance and statistical context

Luminosity distance: 4,900 (-2,500, +4,000) Mpc
Redshift: 0.77
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230928_215827

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

JSON record GWOSC event page