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The current RATAN-600 observations of Cygnus X-1

ATel #7322; S. A. Trushkin, N. A. Nizhelskij, P. G.Tsybulev, G. V. Zhekanis (SAO RAS, Russia)
on 31 Mar 2015; 07:40 UT
Credential Certification: Sergei Trushkin (satr@sao.ru)

Subjects: Radio, Optical, X-ray, Gamma Ray, Binary, Black Hole

Referred to by ATel #: 7327, 9089, 10459

We continue monitoring of Cygnus X-1 at 4.8 GHz with the RATAN-600 radio telescope during first months of 2015 (see also ATEL#3546). We confirmed the transition of Cygnus X-1 into the hard state (ATEL#7316) because we have also detected the increase (from less 5 mJy to ~30 mJy) of the flux density at 4.8 GHz during the last 15 days when the hard X-ray flux (Swift/BAT) began to increase. Cygnus X-1 was weaker 5 mJy (4.8 GHz) during total February and beginning of March 2015. The 4.8 GHz light curve of Cygnus X-1 during 15-31 March 2015 is shown in the plot:

The RATAN-600 4.8 GHz light curve of Cygnus X-1 in 2015