THE DISCOVERY OF AN ERUPTING DWARF NOVA IN NGC-6624

The core of the globular cluster NGC 6624 has been imaged with the Hub ble Space Telescope at three separate epochs. We report the detection of a dwarf nova in eruption at a distance of 5 core radii from the cen ter of the cluster-one of the densest in the Galaxy. This is only the fourth dwarf nova detected in a globular cluster. Our temporal coverag e implies that there are unlikely to be more than three dwarf novae in the cluster, unless globular cataclysmics erupt much less frequently than those in the field.