Swift XRT observations of the black hole binary V4641 Sgr
Abstract
In response to the recent X-ray and optical activity reported in VSNET alerts, we have performed a Swift ToO observation of V4641 Sgr on October 17 2008, for a total exposure of 2.1 ks. The source was clearly detected in the Swift XRT image. The energy spectrum was could be fit reasonably well by an absorbed power law with a photon index of 2.1+-0.2 and a hydrogen column density of (2.9+-0.6)x10^21 cm^-2.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- October 2008
- Bibcode:
- 2008ATel.1796....1Y
- Keywords:
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- X-ray;
- Request for Observations;
- Binaries;
- Black Holes;
- Transients