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Date: Fri, 2 Jul 93 14:38:01 EDT From: Kurt w. Weiler <kweiler@shimmer.nrl.navy.mil> Subject: SN1993J First Detection at 20 cm Wavelength SN 1993J in NGC 3031 S. D. Van Dyk, H.-A. Nguyen, & K. W. Weiler, Naval Research Laboratory; R. A. Sramek & M. P. Rupen, National Radio Astronomy Observatory; and N. Panagia, Space Telescope Science Institute, report that new observations of SN 1993J made with the Very Large Array in `CnB' and `C' configurations show that radio emission from the supernova is now detectable at 20-cm wavelength (1.45 GHz) for the first time. On and prior to 25 May 1993, no emission was detectable to a limit (3 sigma) of 0.25 mJy in that band, while by 11 June, 18 June, and 25 June, the source was detectable at levels of 1.3, 1.8, and 3.6 mJy, respectively. The source remains strong (>50 mJy) in the three previously detected radio bands (1.3-cm, 2-cm, and 3.6-cm wavelength) and continues to rapidly increase in flux density at 6-cm wavelength. Monitoring with the VLA in all bands continues.
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