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We present O CAESAR, the Optical CAtalogue of Extragalactic SupernovARemnants. O CAESAR will provide the largest homogeneous optical survey ofextragalactic SNR candidates taken by the same telescope, the same instrument,and under similar observational conditions. Our sample is volume-limited (D$\leq$ 10 Mpc) and includes mostly galaxies ($\sim$40) from the Large ProgramSIGNALS. The Observations are carried out using SITELLE, the imaging Fouriertransform spectrograph of the Canada-France-Hawaii Telescope. Using threefilters, we are able to measure the strong emission lines [O II]$\lambda$3727,H$\beta$, [O III]$\lambda\lambda$4959,5007, H$\alpha$, [NII]$\lambda\lambda$6548,6583, and [S II]$\lambda\lambda$6716,6731.Identification of the SNR candidates will be done automatically and will bebased on four criteria for regions where the emission lines flux ratio [SII]/H$\alpha$ $\ge$ 0.4. To confirm the shock-heated nature of the ionizationmechanism in the candidates derived from our sample, we adopted aself-consistent spectroscopic analysis using the whole set of emission linesavailable with our SITELLE data and considering Sabbadin plots and BPTdiagrams. We here present our method and first results for the spiral galaxyNGC 3344.

O CAESAR: The Optical CAtalogue of Extragalactic SupernovA Remnants