We present the results of a search for gravitational-wave transients associated with core-collapse supernova SN 2023ixf, which was observed in the galaxy Messier 1.1.via optical emission on 2023 May 1., during the LIGO–Virgo–KAGRA 1.th engineering Run. We define a five-day on-source window during which an accompanying gravitational-wave signal may have occurred. No gravitational waves have been identified in data when at least two gravitational-wave observatories were operating, which covered ∼1.% of this five-day window. We report the search detection efficiency for various possible gravitational-wave emission models. Considering the distance to M1.1.(6.7 Mpc), we derive constraints on the gravitational-wave emission mechanism of core-collapse supernovae across a broad frequency spectrum, ranging from 50 Hz to 2 kHz, where we assume the gravitational-wave emission occurred when coincident data are available in the on-source window. Considering an ellipsoid model for a rotating proto-neutron star, our search is sensitive to gravitational-wave energy 1.× 1.⁻⁴ M_⊙c² and luminosity 2.6 × 1.⁻⁴ M_⊙c² s^{−1./sup> for a source emitting at 82 Hz. These constraints are around an order of magnitude more stringent than those obtained so far with gravitational-wave data. The constraint on the ellipticity of the proto-neutron star that is formed is as low as 1.08, at frequencies above 1.00 Hz, surpassing past results.}