Continuing observations of the recent Cygnus X-3 outburst with the Nasu telescope array at 1.4GHz
ATel #15018; K. Tsubono (Univ. Tokyo), K. Asuma (Asaka High School), K. Niinuma (Yamaguchi Univ.), K. Takefuji (JAXA) and T. Daishido (Waseda Univ.)
on 6 Nov 2021; 13:43 UT
Credential Certification: Kimio Tsubono (tsubono@phys.s.u-tokyo.ac.jp)
Subjects: Radio, Binary, Black Hole, Transient
Referred to by ATel #: 15152
A new outburst from Cygnus X-3 has been continuously observed by the Nasu telescope array at 1.4GHz (ATel #14989). The burst, which began on October 19 UT, reached a peak on October 23 with the flux density of 4.8+-0.02 Jy. The light curve observed from October 19 to November 5 can be seen in the figure below. The waveform of the light curve shows rather choppy behavior among those recently obtained from Cygnus X-3.
AGILE team reported an intense transient gamma-ray activity from Cygnus X-3 integrating from 2021-10-25 UT to 2021-10-29 UT, and suggested the emergence from a deep and prolonged quenched state of Cygnus X-3 (ATel #15009). From the look of recent Swift/BAT data (15-50 keV; http://swift.gsfc.nasa.gov/results/transients/CygX-3/ ), this emergence does not seem to be conclusive yet.
The Nasu telescope array is a spatial fast Fourier transform (FFT) interferometer consisting of eight linearly aligned antennas with 20 m spherical dishes. This type of interferometer was developed to survey transient radio sources with an angular resolution as high as that of a 160 m dish and a field of view as wide as that of a 20 m dish.
Nasu telescope array HP:
https://nasu-radio-telescope.space
Cygnus X-3 light curve at 1.4GHz
