[vsnet-alert 24268] SDSS J124058.03-015919.2: short outburst in the dip of the double superoutburst

[Keisuke Isogai]

SDSS J124058.03-015919.2: short outburst in the dip of the double superoutburst

    This object is an AM CVn star that seems to show a WZ Sge-type
"double superoutburst". On May 4th, the first superoutburst finished
and the object faded from 14 to 17 mag (the quiescent mag is 20).
Now, we are waiting for the second superoutburst.
     According to the data by Josch Hambsch, this object showed a
short (normal) outburst on May 8th and returned back to 17 mag
soon. Such a short outburst in the dip phase of a double superoutburst
had never been recorded! This phenomenon may give us a hint of
understanding the double superoutbursts.
     Further observations are strongly encouraged. In particular, *data**
**from the European region are lacked*. Snapshots are also welcomed.