Galactic Bulge Microlensing Events from the MACHO Collaboration

We present a catalog of 450 high signal-to-noise microlensing events observedby the MACHO collaboration between 1993 and 1999. The events are distributedthroughout our fields and, as expected, they show clear concentration towardthe Galactic center. No optical depth is given for this sample since noblending efficiency calculation has been performed, and we find evidence forsubstantial blending. In a companion paper we give optical depths for thesub-sample of events on clump giant source stars, where blending is not asignificant effect. Several events with sources that may belong to the Sagittarius dwarf galaxyare identified. For these events even relatively low dispersion spectra couldsuffice to classify these events as either consistent with Sagittariusmembership or as non-Sagittarius sources. Several unusual events, such asmicrolensing of periodic variable source stars, binary lens events, and anevent showing extended source effects are identified. We also identify a numberof contaminating background events as cataclysmic variable stars.