Swift/XRT observations of Cyg X-1 during state transition

Details Swift/XRT observations of Cyg X-1 during state transition Swift/XRT observations of Cyg X-1 during state transition

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2724....1e&link_type=abstract

The Astronomer's Telegram, #2724

Astronomy and Astrophysics

Astronomy

X-Ray, Binaries, Black Holes

Scientific paper

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.

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