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Date: Mon, 26 Apr 93 16:35:51 EDT From: Kurt w. Weiler <kweiler@shimmer.nrl.navy.mil> Subject: Updated Radio Results SN 1993J in NGC 3031 S. D. Van Dyk & 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 on 1993 April 22.47 UT with the Very Large Array in `B' configuration show that the source currently has a flux density at 1.3-cm wavelength (22.5 GHz) of 39.94 +/- 0.53 mJy; the radio light curve at this frequency appears to be flattening as expected from preliminary model predictions (IAUC 5762). A slow decline in the flux density at 1.3-cm should commence shortly. The supernova also has flux densities of 37.35 +/- 0.34 mJy at 2.0-cm wavelength (14.9 GHz), 11.77 +/- 0.07 mJy at 3.6-cm wavelength (8.4 GHz), and 1.70 +/- 0.07 mJy at 6 cm wavelength (4.86 GHz). This flux density evolution is consistent with previous model estimates (IAUC 5762) to within the predictive capability of the model from the few data points available at that time. Revised estimates will be issued shortly. Radio monitoring is continuing on a nearly daily basis at these and other wavelengths in order to follow the supernova's rapidly changing behavior.
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