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[vsnet-campaign-v4641sgr 35] Re: V4641 Sgr large-amplitude variation!


   Our run at Ouda observatory revealed that V4641 Sgr 
frequently showed "dip"-like variations last night.
As reported by Kato-san, the prominent dip occurred around 
May 23.755 U, and furthermore, the light curve observed at Ouda 
shows additional dips around 23.717, 23.731, and 23.765 UT.
All of them have very sharp profiles and short-term modulations 
were less prominent during these dips.  Some variations were also 
appeared, except for the dips, but their time-scale was relatively 
long.  Oscillations of sec-time scales were very weak, or disappeared.

Regards,
MAkoto Uemura

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