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Date: Fri, 14 May 93 14:09:26 EDT From: Kurt w. Weiler <kweiler@shimmer.nrl.navy.mil> Subject: Update on Radio Behavior of SN1993J Radio Emission from SN 1993J in NGC 3031 K. W. Weiler & S. D. Van Dyk, 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 `B' configuration show that the source appears to have reached a peak flux density at 1.3-cm wavelength (22.46 GHz) of 62.9 +/- 0.68 mJy on 1993 May 4.265 UT and has begun the predicted decline at that wavelength. By 1993 May 11.736 UT the 1.3 cm flux density had declined to 46.7 +/- 0.44 mJy. At 2-cm wavelength (14.940 mJy), the flux density appears to be levelling off at about 65 - 70 mJy with a value of 67.44 +/- 0.4 mJy on 1993 May 7.135 UT. As expected, the flux density is continuing to increase at longer wavelengths: 3.6-cm wavelength (8.440 GHz) reached a value of 37.07 +/- 0.06 mJy on 1993 May 7.122 UT and at 6-cm wavelength (4.860 GHz) reached a value of 10.51 +/- 0.06 mJy on 1993 May 7.098 UT. 14 May 1993
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