2004IAUC.8415....1S

C. J. Stockdale, Marquette University; K. W. Weiler, Naval Research Laboratory; S. D. Van Dyk, Spitzer Science Center, California Institute of Technology; R. A. Sramek, National Radio Astronomy Observatory; N. Panagia, European Space Agency and Space Telescope Science Institute; and J. M. Marcaide, University of Valencia, report the detection of radio emission from the type-II supernova 2004et (IAUC 8413, 8414) with the Very Large Array in 'A' configuration: "Radio-flux densities on Oct. 5.128 UT of 1.33 ± 0.20 mJy at 22.460 GHz (wavelength 1.3 cm) and 0.34 ± 0.06 = mJy at 8.460 GHz (wavelength 3.6 cm) were observed at R.A. = 20h35m25s.36, Decl. = +60o07'17".7 (equinox 2000.0; ± 0".1 in each coordinate). This is in close agreement with the reported optical position. On Sept. 30.18, no radio emission was detected at that position, with 3-sigma upper limits of 1.29 mJy at 22.460 GHz and 0.29 mJy at 8.460 GHz. This is the eighth supernova recorded in NGC 6946 in the modern era, four of which have been radio-detected; NGC 6946 is the most prolific supernova-producing galaxy known. SN 2004et has clearly been caught during its turn-on phase for the centimeter radio emission, and observations in other wavebands are urged. Radio observations are continuing."