SUPERNOVA 2006X IN NGC 4321 (M100)

ATel #729; C. J. Stockdale and M. Kelley, Marquette University; R. A. Sramek, National Radio Astronomy Observatory; S. D. Van Dyk, Spitzer Science Center, California Institute of Technology; S. Immler, Goddard Space Flight Center and Universities Space Research Association; K. W. Weiler and C. L. M. Williams, Naval Research Laboratory; and N. Panagia, Space Telescope Science Institute
on 9 Feb 2006; 16:26 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Kurt W. Weiler (Kurt.Weiler@nrl.navy.mil)

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We report the lack of detection of radio emission near the position of the type-Ia supernova 2006X (IAUC 8667 , CBET 393) with the Very Large Array: “Upper limits (3 sigma) to any radio flux density were established on 2006 Feb. 09.37 UT of <0.162 mJy (Spectral Luminosity < 5.6 x 10^25 erg/s/Hz) at 22.460 GHz (wavelength 1.3 cm) and <0.047 mJy (Spectral Luminosity < 1.5 x 10^25 erg/s/Hz) at 8.460 GHz (wavelength 3.5 cm), among the deepest and earliest limits yet obtained for radio emission from a type Ia supernova. Under standard assumptions, this implies a mass loss rate from the presupernova system of < few x 10^-8 Msun/yr. The search for radio emission was conducted within ~10” of the published optical position of SN 2006X (R.A. = 12h22m53.s99, Decl. = +15o48’33”.1, equinox 2000.0; IAUC 8667 ) and no radio emission was detected near the supernova position exceeding three times the map rms at any of the times or in any of the frequency bands listed.”