Skip to content

Missions Planets Black Holes 3D Map Agencies Blog About Sign in

Menu

Missions Planets Black Holes 3D Map Agencies Blog About Sign in

Acquiring mission data

Missions Planets Black Holes 3D Map Agencies Blog About apexandromeda.com

This is an independent informational project and is not affiliated with, endorsed by, or sponsored by NASA, ESA, JAXA, Roscosmos, CNSA, ISRO, CSA, or any other space agency. Agency names, logos, and other marks are used for identification where permitted by their respective usage policies.

A passion project from the team behind Apex Rental Pro.

GW230628_231200 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW230628_231200

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW230628_231200

Both component-mass lower bounds exceed 3 solar masses

Primary mass32.5 M☉

Secondary mass27 M☉

ObservedJun 28, 2023

Event identity

Classification and release

ID: gwtc:GW230628_231200
Event name: GW230628_231200
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: Wednesday, June 28, 2023 at 11:12:00 PM UTC UTC
GPS time: 1,372,029,138.4

Source-frame posterior

Component and remnant masses

Primary mass: 32.5 (-3.9, +6.1) M☉
Secondary mass: 27 (-5.2, +4.9) M☉
Remnant mass: 56.4 (-4.5, +8) M☉
Effective spin: -0.01
Network SNR: 16.4

Propagation

Distance and statistical context

Luminosity distance: 2,260 (-1,080, +790) Mpc
Redshift: 0.4
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-4.1

GW230628_231200

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

JSON record GWOSC event page