Swift Observations of Rapid X-ray Flux Variations in V4641 Sgr

Details Swift Observations of Rapid X-ray Flux Variations in V4641 Sgr Swift Observations of Rapid X-ray Flux Variations in V4641 Sgr

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007atel.1135....1c&link_type=abstract

The Astronomer's Telegram, #1135

Astronomy and Astrophysics

Astronomy

X-Ray, Binaries, Black Holes, Transients

Scientific paper

Following the recent optical activity of the black hole binary V4641 Sgr (ATEL #1134), we observed V4641 Sgr with Swift XRT over the period May 23 to 25 2007. During the first set of observations on May 23, V4641 Sgr was observed for ~1.8 ks, and the source is clearly detected by the XRT. We measure a 0.5-10 keV flux = (1.2 +/- 0.2)E-11 ergs/cm^2/s. The spectrum is well-fit by a simple absorbed power-law, with N_H fixed at the Galactic value (1.81E21 cm^-2), and a power-law spectral index = 1.5 +/- 0.2.

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