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We utilize the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS)HST/ACS dataset for a Deep Rapid Archival Flare Transient Search (DRAFTS) toconstrain the flare rate toward the older stellar population in the Galacticbulge. During 7 days of monitoring 229,293 stars brighter than V=29.5, we findevidence for flaring activity in 105 stars between V=20 and V=28. We dividedthe sample into non-variable stars and variable stars whose light curvescontain large-scale variability. The flare rate on variable stars is \sim 700times that of non-variable stars, with a significant correlation between theamount of underlying stellar variability and peak flare amplitude. The flareenergy loss rates are generally higher than those of nearby well-studied singledMe flare stars. The distribution of proper motions is consistent with theflaring stars being at the distance and age of the Galactic bulge. If they aresingle dwarfs, they span a range of \approx 1.0 - 0.25M\odot. A majority of theflaring stars exhibit periodic photometric modulations with P <3d. If these aretidally locked magnetically active binary systems, their fraction in the bulgeis enhanced by a factor of \sim20 compared to the local value. These stars maybe useful for placing constraints on the angular momentum evolution of coolclose binary stars. Our results expand the type of stars studied for flares inthe optical band, and suggest that future sensitive optical time-domain studieswill have to contend with a larger sample of flaring stars than the M dwarfflare stars usually considered.

DRAFTS: A Deep, Rapid Archival Flare Transient Search in the Galactic Bulge