GWTC-4.0: O4a Search Sensitivity Estimates

LIGO-Virgo-KAGRA (LVK) search sensitivity estimates are provided for quasi-circular compact binary coalescences (CBCs) during O4a. These are represented as tabular data containing the parameters of simulated CBCs along with the significance assigned to each simulated signal by a number of searches. Details of individual files can be found in gwtc-4_o4a_sensitivity-estimates.md and Essick et al (2025) arXiv:2508.10638 Additional information about cumulative sensitivity estimates spanning O1, O2, O3, and O4 injections is available here: zenodo:16740128