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The Chandra ACIS Survey of M33 (ChASeM33) has acquired 7 fields of ACIS datacovering M33 with 200 ks of exposure in each field. A catalog from the first 10months of data, along with archival Chandra observations dating back to theyear 2000, is currently available. We have searched these data for transientsources that are measured to have a 0.35-8.0 keV unabsorbed luminosity of atleast 4$\times10^{35}$ erg s$^{-1}$ in one epoch and are not detected inanother epoch. This set of the survey data has yielded seven such sources,including one previously-known supersoft source. We analyzed XMM-Newton datafrom the archive distributed over the years 2000 to 2003 to search forrecurrent outbursts and to get a spectrum for the supersoft transient. We findonly one recurrent transient in our sample. The X-ray spectra, light curves,and optical counterpart candidates of two of the other sources suggest thatthey are high-mass X-ray binaries. Archival Spitzer photometry and high X-rayabsorption suggest that one of the sources is a highly variable backgroundactive galactic nucleus. The other three sources are more difficult toclassify. The bright transient population of M33 appears to contain a largefraction of high-mass X-ray binaries compared with the transient populations ofM31 and the Galaxy, reflecting the later morphology of M33.

The Chandra ACIS Survey of M33 (ChASeM33): Transient X-ray Sources Discovered in M33