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V4641 Sgr: short-term violent variation! Dear Colleagues, The VSNET Collaboration has received a substantial number of time-resolved observations during (and preceding) the current activity phase. Up to August 3, the object was rather calm, with a slightly elevated baseline and occasional small flares. On August 4, however, the object showed violent variations! The variations (mainly received from Kiyota-san, Tsukuba, Japan) are composed of short-term variations with time scales of a few minutes to an hour. The light curve is characterized by recurrent occurences of gradual rise (with violent fluctuations) and a sudden drop. The light curve, as a whole, resembles those of violently varying state just after the beginning of the 2002 active phase. Please keep watching the object closely. For CCD observers, please use short (usually less than 15s) integration times when possible, to record the short-term variations! We will inform the ongoing activity in vsnet-campaign-v4641sgr list unless a special change is recorded. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
