RX J2315.5-3049: Very fast superoutburst ?

As reported in [vsnet-outburst 245M] by R. Stubbings, the ROSAT-selected dwarf nova candidate RX J2315.5-3049 experienced the first-ever detected outburst. Stubbings reported that the star was at mv=13.4 on 2000 July 8 (vsnet-campaign 338). T. Augusteijn et al. noticed that this dwarf nova candidate in its first detected outburst has similar features to WZ Sge stars (vsnet-campaign 351). A. Pearce's observation on July 11 suggested it has rapidly faded at 15.3mag and the outburst was a normal one (vsnet-campaign-dn 12).

As reported by R. Stubbings on October 26 in [vsnet-outburst 810], RX J2315.5-3049 experienced the other outburst. Ouda team confirmed the outburst at the magnitude of R=14.2 on October 26 (vsnet-campaign 539). On October 27, Ouda team found the object was brighter at the magnitude of R~13.6 (vsnet-campaign 542). They detected clear periodic modulations in ~3 hours light curve. The period was about 0.078 d and the amplitude is about 0.3mag (vsnet-campaign 544). T. Kato and H. Iwamatsu confirmed the magnitude is going down to about 16mag on November 1 (vsnet-campaign-dn 226, 230). T. Kato analyzed the time-series data on RX J2315.5-3049 on October 27, observed by K. Matsumoto, the Kyoto team. The analysis perfectly confirmed the existence and the phasing of humps reported. The outburst was unusually short for a superoutburst, although the detected hump signature in outburst bore all characteristics of superhumps (vsnet-campaign-dn 244).