Böck, MoritzHanke, ManfredWilms, JörnPirner, StefanGrinberg, VictoriaMarkoff, SeraPottschmidt, KatjaNowak, Michael A.Pooley, Guy2023-10-052023-10-052009-04-15Böck, Moritz, Manfred Hanke, Jörn Wilms, Stefan Pirner, Victoria Grinberg, Sera Markoff, Katja Pottschmidt, Michael A. Nowak, and Guy Pooley. “Catching up on State Transitions in Cygnus X-1.” In Proceedings of VII Microquasar Workshop: Microquasars and Beyond — PoS(MQW7), 62:089. SISSA Medialab, 2009. https://doi.org/10.22323/1.062.0089.https://doi.org/10.22323/1.062.0089http://hdl.handle.net/11603/29990VII Microquasar Workshop: Microquasars and Beyond September 1-5 2008 Foça, Izmir, TurkeyIn 2005 February we observed Cygnus X-1 over a period of 10 days quasi-continuously with the Rossi X-ray Timing Explorer and the Ryle telescope. We present the results of the spectral and timing analysis on a timescale of 90 min and show that the behavior of Cyg X-1 is similar to that found during our years long monitoring campaign. As a highlight we present evidence for a full transition from the hard to the soft state that happened during less than three hours. The observation provided a more complete picture of a state transition than before, especially concerning the evolution of the time lags, due to unique transition coverage and analysis with high time resolution.5 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Attribution-NonCommercial-ShareAlike 1.0 Generic (CC BY-NC-SA 1.0)https://creativecommons.org/licenses/by-nc-sa/1.0/Text