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[vsnet-campaign-v4641sgr 45] V4641 Sgr: seconds-minutes order oscillatoin again


    We performed B-band time-series photometry with the Ouda 60-cm 
telescope.  The light curve shows a very sharp 1.4mag hump around 
24.65 UT (The fading reported by Kato-san corresponds to the fading 
branch of this hump).  The fading from the hump peak stopped at 24.7 
UT, and then, the object again showed seconds-minutes order modulations 
with amplitudes up to 0.4mag.  The average B-magnitude is about 11.8mag.

  We will be able to study color variations during these modulations 
using complitely simultaneous observation at Ouda (B) and Kyoto (Rc).
Further analysis is now ongoing.

Regard,
Makoto Uemura

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