Cyg X-3 is flaring in radio
ATel #3130; Taro Kotani (AGU), Atsushi Miyazaki (NAO), Masato Tsuboi (JAXA), Wataru Endo (U. of Tokyo), Kenta Fujisawa (Yamaguchi U.), Nobuyuki Kawai (Tokyo Tech), Nario Kuno (NRO), Kouichiro Nakanishi (NAO), Kazutaka Yamaoka (AGU), Yoshinori Yonekura (Ibaraki U.)
on 28 Jan 2011; 16:57 UT
Credential Certification: T. Kotani (kotani@hp.phys.titech.ac.jp)
Subjects: Radio, Millimeter, X-ray, >GeV, Binary
We report on the detection of a radio flare from Cyg X-3. The source
has been monitored since 2011/01/19 (UT) (MJD=55580) with Nobeyama
Radio Observatory 45-m Telescope at 43 GHz, 86 GHz, and 98 GHz. After
a week of static activity fainter than 0.2 Jy, the flux densities
exceed 0.2 Jy at the three frequencies on 2011/01/27 (MJD=55588). On
2011/01/28 (MJD=55589), the 43-GHz flux density reaches 0.4 Jy and the
densities at 86 GHz and 98 GHz exceed 1 Jy. The fluxes are still
increasing and varying with time scales shorter than 1 hr. See http://xray1.hp.phys.titech.ac.jp :8000/rj/32 for update.
Cyg X-3 is known to exhibit successive giant radio flares after a
certain period of static radio activity and soft-high X-ray state
(Szostek, A., Zdziarski, A. A., McCollough, M. L. 2008, MNRAS 388,
1001). See the MAXI data http://maxi.riken.jp/top/index.php?cid=000000000001&star_dir_id=00000000418
for the current soft-high X-ray activity. This flare might be the
beginning of such a series of giant radio flares. Observations at all
wavelengths are encouraged.