Swift/XRT observations of Cyg X-1 during state transition
Abstract
Following the MAXI/GSC (ATel #2711) and RXTE/ASM (ATel #2714) detection of a spectral softening of the BHC Cyg X-1, we requested and obtained a SWIFT/XRT ToO observation of the source. The SWIFT/XRT observations were performed on 2010-07-02 between 14:06:17 UT and 18:27:40 UT in WT mode, for a total on-source time of about 6 ks distributed in three intervals of 2525 s, 2525 s and 885 s. We performed a spectral fit of the three observations using a model composed by an absorbed disc black body plus a power-law.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- July 2010
- Bibcode:
- 2010ATel.2724....1E
- Keywords:
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- X-ray;
- Binaries;
- Black Holes