Long term variability of Cygnus X-1

@inproceedings{Grinberg2013LongTV,
  title={Long term variability of Cygnus X-1},
  author={Victoria Grinberg and Natalie Hell and Katja Pottschmidt and Moritz Boeck and Michael A. Nowak and Javier Rodr{\'i}guez and Arash Bodaghee and Marion Cadolle Bel and Gary Lee Case and Michael Hanke and Matthias Kuehnel and Sera Brodie Markoff and Guy G. Pooley and Richard E. Rothschild and John A. Tomsick and Colleen Anne Wilson-Hodge and Joern Wilms},
  year={2013}
}
We present a scheme for determining the spectral state of the canonical black hole Cyg X-1 using data from previous and current X-ray all sky monitors (RXTE-ASM, Swift-BAT, MAXI, and Fermi-GBM). Determinations of the hard/intermediate and soft state agree to better than 10% between different monitors, facilitating the determination of the state and its context for any observation of the source, potentially over the lifetimes of different individual monitors. A separation of the hard and the… CONTINUE READING

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