New giant radio flare of microquasar Cyg X-3

Trushkin S. A.; Tsybulev P. G.; Bursov N. N.; Shevchenko A. V.

We carry out the multi-frequency monitoring of the Galactic microquasars with the RATAN-600 radio telescope and on 6 April 2026 detected the giant flare from the microquasar Cygnus X-3 at frequencies 4.7-30 GHz. It was the first increase of radio emission from 22 February, when we detected small flare with fluxes from 0.5 to 1.2 Jy at frequencies 1.24-11.2 GHz. Later Cyg X-3 was in so-called hyper-soft X-ray state during at least 30 days, as we can propose from very low hard X-ray emission (10-20 keV, MAXI), while soft X-ray (2-4 keV, MAXI) fluxes became at high levels.