[vsnet-campaign-v4641sgr 62] Re: V4641 Sgr run on May 25-26 (Berto Monard)

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

Re: V4641 Sgr run on May 25-26 (Berto Monard)

>     Most surprizingly, Berto's observation just followed the period of
> "violent variations" observed in Japan.  The object suddenly switched
> from the violently variable state to a calm state when Berto started
> the run.  The light curve dramatically shows this transition!
> 
>     Such a transition strongly resembles state changes seen in the microquasar
> GRS 1915+105 in X-rays.  V4641 Sgr has apparently experienced a number of
> similar state chanes in the past few days.  The analysis is keenly in
> progress.

   Further to note, Tom Richards' run just preceded the observations in Japan.
The object was again relatively calm during Richards' run, indicating that
the "violently variable" segment of the light curve lasted for ~hours.
Observers apparently need both patience and luck to detect violent
variations!

Regards,
Taichi Kato
VSNET Collaboration team

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