[vsnet-campaign-v4641sgr 91] V4641 Sgr recent short-term variation

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

V4641 Sgr recent short-term variation

Dear Colleagues,

   We have received new data from Tanabe-san (2 nights).  We are also
analyzing the Kyoto data up to last night.  Preliminary analysis of
the June 5 data revealed the presence of short-term small flare-like
brightenings with amplitudes of ~0.1 mag and recurrence times of
0.01-0.02 d.  On June 6 the variation looks less evident.

   In conjunction with the visual detection of activity by Rod Stubbings,
the source is most likely still active, although the mean magnitude has
slightly faded.  Further observations are strongly encouraged.

Regards,
Taichi Kato
VSNET Collaboration team

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