2003IAUC.8157....3S

Further to IAUC 8153, C. J. Stockdale, R. A. Sramek, K. W. Weiler, S. D. Van Dyk, and N. Panagia, report a search with the VLA for radio emission from the type-Ia supernova 2002ic (IAUC 8019, 8028, 8151), possibly the first type-Ia event found showing significant interaction between the ejecta and a dense circumstellar medium: "Hamuy et al. (2003, http://xxx.lanl.gov/abs/astro-ph/?0306270), suggest a similarity to type-IIn supernovae. Our 3-sigma upper limit of 1.28 mJy was obtained at 22.485 GHz (wavelength 1.3 cm) on June 17.79 UT (supernova age approximately 216 days) in 'A'-configuration at the optical position (IAUC 8019). Comparison with the radio emission from the type-IIn supernova 1988Z (and the very similar SN 1986J) indicates that SN 1988Z, at the distance of SN 2002ic, would have yielded a 5-sigma detection at this frequency and epoch (cf. Williams et al. 2002, Ap.J. 581, 396). If SN 2002ic were indeed similar to a type-IIn supernova, lower frequencies would be optically thick at this epoch of observation, as is implied by the upper limit obtained by Berger et al. (see above) at 4.86 GHz on the same date. Additional observations are planned."