10 years of Flaring activity of Cygnus X-3 and new galactic Binary 2129+47XR

Cygnus X-3 is peculiar X-ray binary system discovered about 40 years ago. The system has been observed throughout wide range of the electromagnetic spectrum. It is one of the brightest Galactic X-ray sources, displaying high and low states and rapid variability in X-rays. It is also the strongest radio source among X-ray binaries and shows both huge radio outbursts and relativistic jets. The radio activity is closely linked with the X-ray emission and the different X-ray states. Based on the detections of ultra high energy gamma-rays, Cygnus X-3 has been proposed to be one of the most powerful sources of charged cosmic ray particles in the Galaxy. The binary Cyg X-3 came to new period of flaring activity at radio- and X-ray energies in 2006. In May and July 2006 the significant increase of Cyg X-3 flux have detected with SHALON at TeV energy. The gamma-ray flux detected by SHALON in 2006 was estimated as (1.47 ± 0.24) x 10-12 cm-2 s-1 with the indices of integral spectra are kγ = -1.21 ± 0.06, kON = -1.65 ± 0.11 and kOFF = -1.73 ± 0.11. The gamma-ray flux detected by SHALON in 2003 was estimated as (1.:79 ± 0:.3) x 10-12 cm-2 s-1 with the indices of integral spectra are k = -1.28 ± 0.06, kON = -1.65 ± 0.11 and kOFF = -1.74 ± 0.11. Earlier, in 1997, a comparable increase of the flux over the average value was also observed and estimated to be (1.2 ± 0.5) x 10-12 cm-2 s-1. These results provide an evidence for a variability of the flux. Confirmation of the variability (and, perhaps, periodicity) of very high-energy gamma radiation from Cygnus X-3 by the future observations would be important for understanding the nature of this astrophysical object. The new galactic gamma-source neutron star 2129+47XR is detected at energy > 0.8 TeV with flux (0.19 ± 0.9) x 10-12 cm-2 s-1 and indices of the integral spectra are kγ = -1.05 ± 0.10, kON = -1.54 ± 0.10 and kOFF = -1.74 ± 0.10. (authors)