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A rapidly growing flare of Cygnus X-3 observed with the Nasu telescope array at 1.4GHz

ATel #13470; K. Tsubono (Univ. Tokyo), K. Asuma (Asaka High School), K. Niinuma, T. Aoki (Yamaguchi Univ.), K. Takefuji (JAXA), and T. Daishido (Waseda Univ.)
on 12 Feb 2020; 14:20 UT
Credential Certification: Kimio Tsubono (tsubono@phys.s.u-tokyo.ac.jp)

Subjects: Radio, Binary, Black Hole, Transient

Referred to by ATel #: 13866

Recent quenched/hypersoft state and gamma-ray flare of Cygnus X-3 were reported by AGILE team (ATel #13423, #13458). After that, RATAN 600 reported the beginning of a radio flare from Cygnus X-3 (ATel #13461).

With the Nasu telescope array, we have been monitoring Cygnus X-3 daily from last October (drift-scan mode). On February 8 this year, we could observe the appearance of a new activity of Cygnus X-3 with the flux level of 1.48 +/- 0.02 Jy (UT 02:17) at 1.4 GHz. During next four days the observed flux showed rapid increase up to 15.11 +/- 0.02 Jy on February 12 02:01 UT. Ten days light curve including preceding five days data with five-sigma noise level can be shown in the figure below.
We will continue our radio monitoring for a while.

The Nasu telescope array is a spatial FFT interferometer consisting of linearly aligned eight antennas with 20-m spherical dishes. This type of interferometer was developed to survey transient radio sources with a high angular resolution that of 160-m dish and at the same time with a wide field-of-view that of 20-m dish.

10 days light curve of Cyg X-3 at 1.4GHz