[vsnet-campaign-v4641sgr 11] V4641 Sgr X-ray activity

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

V4641 Sgr X-ray activity

   According to IAUC 7906 (Markwardt and Swank), V4641 Sgr is also reported
to be active in X-ray.  X-ray flux from RXTE PCA monitoring (mCrab):
4.5 +/- 0.3 (May 17.6), 10.0 +/- 0.5 (May 20.9).

   These observations indicate that the X-ray activity may have slightly
preceded the optical rise.

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