Recent outburst of Cygnus X-3 observed with the Nasu telescope array at 1.4GHz
ATel #16520; K. Tsubono (Univ. Tokyo), K. Asuma (Asaka High School), K. Niinuma (Yamaguchi Univ.), K. Takefuji (JAXA) and T. Daishido (Waseda Univ.)
on 11 Mar 2024; 00:42 UT
Credential Certification: Kimio Tsubono (tsubono@phys.s.u-tokyo.ac.jp)
Subjects: Radio, Binary, Black Hole, Transient
Referred to by ATel #: 16574
irstly, in ATel #16455, we incorrectly reported the date of the first detection of a new outburst from Cygnus X-3 as February 16 UT. The corrected date of the first observation was February 15 UT. We apologize for this inconvenience.
As stated in ATel #16455, the Nasu telescope array at 1.4GHz detected a new outburst from Cygnus X-3 on 2024 February 15 01:34 UT (MJD 60355.07) with a flux level of 1.8 +/- 0.04 Jy. After the first detection the observed flux rapidly increased up to 7.5 +/- 0.05 Jy on February 18 01:22 UT (MJD 60358.06) (ATel #16455, #16466). Then with some fluctuations the signal gradually faded below the five-sigma noise level by March 3. The light curve we have observed from February 12 to March 9 can be viewed here. The observed waveform of the light curve was more like a simple single shot.
Since Cygnus X-3 is still in the quenched state as shown in Swift/BAT data (15-50 keV; http://swift.gsfc.nasa.gov/results/transients/CygX-3/ ), we can anticipate rebrightening of the source as reported in ATel #12880. We will continue our observations.
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
