Grinberg, V.Boeck, M.Pottschmidt, KatjaPooley, G. G.Wilms, J.Nowak, M. A.Bel, M. CadolleRodriguez, J.Marcu, D. M.Uttley, P.Tomsick, J. A.Bodaghee, A.Markoff, S. B.2023-09-212023-09-212011-08-31Grinberg, V. et al. “Cygnus X-1 entered the soft state”. ATel.3616, (31 Aug 2011). https://astronomerstelegram.org/?read=3616http://hdl.handle.net/11603/29813en-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.RadioX-rayBinaryBlack HoleText