[vsnet-campaign-xray 355] V4641 Sgr: still active

[Makoto Uemura]

V4641 Sgr: still active

    We have received new data sets from C. Stockdale (June 5 & 6) and 
T. Richards (June 5).  Thanks for all!

    Rapid brightenings reported by several visual observations are 
confirmed by the CCD observations.  The light curve on June 5 shows 
a relatively large flare with an amplitude of ~0.25 mag and a 
duration of 1 hour.  Some mora rapid flares (~a few minutes) are also 
seen during the flare.  In the light curve on June 6, we can see 
some flares of 0.1-0.2mag and a few minutes.  

    The object has been in a post-outburst active phase for 10 days
since June 27.  

Regards,
Makoto Uemura
Hiroshima University