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GW200308_173609 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW200308_173609

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW200308_173609

Both component-mass lower bounds exceed 3 solar masses

Primary mass60 M☉

Secondary mass24 M☉

ObservedMar 8, 2020

Event identity

Classification and release

ID: gwtc:GW200308_173609
Event name: GW200308_173609
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-3-confident
Preferred event version: v1
Observed at: Sunday, March 8, 2020 at 5:36:09 PM UTC UTC
GPS time: 1,267,724,187.7

Source-frame posterior

Component and remnant masses

Primary mass: 60 (-29, +166) M☉
Secondary mass: 24 (-13, +36) M☉
Remnant mass: 88 (-47, +169) M☉
Effective spin: 0.16
Network SNR: 4.7

Propagation

Distance and statistical context

Luminosity distance: 7,100 (-4,400, +13,900) Mpc
Redshift: 1.04
Astrophysical probability: 0.8566
False-alarm rate: 2.4

Provenance

Official source record

GWOSC · GWTC-3-confident

GW200308_173609

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

JSON record GWOSC event page