SIMBAD references

C. J. Stockdale, Marquette University; S. D. Van Dyk, Infrared Processing and Analysis Center, California Institute of Technology; R. A. Sramek, National Radio Astronomy Observatory (NRAO); K. W. Weiler, Naval Research Laboratory; N. Panagia, European Space Agency and Space Telescope Science Institute; M. P. Rupen, NRAO; and B. Paczynski, Princeton University, report the detection of radio emission near the position of the type-Ib/c supernova 2001em (IAUC 7722, 7737) with the Very Large Array (VLA): "Radio-flux densities on 2003 Oct. 17.18 UT of 1.151 ± 0.051 mJy at 8.435 GHz (wavelength 3.6 cm), and on 2004 Jan. 30.90 of 1.815 ± 0.099 mJy at 4.860 GHz (wavelength 6.2 cm), 1.480 ± 0.052 mJy at 8.460 GHz, and 1.200 ± 0.162 at 14.94 GHz (2.0 cm), were observed at R.A. = 21h42m23s.61, Decl. = +12o29'50".3 (equinox 2000.0; ± 0".2 in each coordinate). This is in near coincidence (< 1") with the reported optical position of SN 2001em (position end figures 23s.66, 50".9; IAUC 7722). The source appears variable at 3.6 cm and is mildly non-thermal (alpha = -0.37; S is proportional to nu**alpha) between 4.9 and 14.9 GHz. SN 2001em appears to be the most luminous (currently about 2 x 10**28 erg s**-1 Hz**-1 at 6 cm for a distance of 90 Mpc) type-Ib/c supernova ever observed at such a late epoch, about fifty times more radio luminous than SN 1998bw at a comparable age. We are continuing to monitor this source with the VLA."