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Observations of recent Cyg X-3 activities with Nasu telescope array at 1.4GHz

ATel #10274; K. Tsubono, K. Asuma, S. Kida, H. Nakajima, T. Daishido (Waseda Univ.), K. Niinuma, T. Aoki (Yamaguchi Univ.), and K. Takefuji (NICT)
on 17 Apr 2017; 18:49 UT
Credential Certification: Kimio Tsubono (tsubono.kimio@aoni.waseda.jp)

Subjects: Radio, Binary, Black Hole, Transient

Several authors have reported on the recent increasing radio and gamma-ray emissions originating from Cyg X-3 (ATel #10109, #10126, #10138, #10252, #10257). In order to measure the low frequency behavior of this source, we have started the observation of Cyg X-3 at 1.4GHz with Waseda university Nasu telescope array. On 2017 April 12 22:02 UT, we could find a 1990 +/- 60 mJy peak at the position of Cyg X-3. During next three days the observed flux was decreasing to 990 +/- 34 mJy on April 15 21:51 UT. Four days light curve can be shown in the figure below. The light curve shows monotonic decrease with the exponential decay time of about five days.
We will continue this radio observation run for a while.

Waseda university 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.

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