Abstract
Abstract We observed the ROSAT-selected eclipsing dwarf nova GY Cnc ($= \mathrm{RX}\,\mathrm{J}0909.8{+}1849$) during the 2001 November outburst. We refined the orbital period to be 0.17544251(5)d. The fading portion of the outburst was indistinguishable from those of typical dwarf novae with similar orbital periods. However, the signature of the orbital humps (or a hot spot) was far less prominently observed in the orbital light curves and eclipse profiles than in usual dwarf novae with similar orbital periods. The combination of a low frequency of outbursts and an apparent lack of slowly rising, long outbursts in GY Cnc is difficult to reconcile within the standard framework of dwarf novae. We suspect that GY Cnc may be the first above-the-gap counterpart of the unusual eclipsing dwarf novae HT Cas and IR Com.
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