GW230529 represents a landmark gravitational wave detection by the LIGO-Virgo-KAGRA Collaboration during the O4 run. The primary component was determined to be 2.5 to 4.5 solar masses—placing it squarely in the elusive lower "mass gap" between known neutron stars and stellar-mass black holes. The secondary object was a 1.2 to 2.0 solar mass neutron star.
| Observatory / Instrument | Spectral Regime | Observational Detection & Counterpart Findings |
|---|---|---|
|
ZTF / DECam
|
Optical
|
Rapid tiling of 90% sky map; no optical kilonova detected due to large error volume.
|
|
Fermi GBM
|
Gamma-ray
|
No contemporaneous sub-threshold gamma-ray burst identified within ±10s.
|
|
Swift XRT
|
X-ray
|
Target of Opportunity pointed at high-probability galaxy clusters.
|