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Circular No. 8282 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304 Phone 617-495-7440/7244/7444 (for emergency use only) SUPERNOVA 2004S IN MCG -05-16-21 R. Martin, Perth Observatory, reports the discovery of an apparent supernova (mag 16) on red CCD images taken on Feb. 3.542 and 4.560 UT with the 0.61-m Perth/Lowell Automated Telescope in the course of the Perth Automated Supernovae Search. SN 2004S was not visible on an image taken on 2003 Dec. 30.583 (limiting mag 19). J. Biggs reports the following position for SN 2004S from an unfiltered images taken around 2004 Feb. 5.65, when the object appeared at R about 13.6 +/- 0.3: R.A. = 6h45m43s.50 +/- 0".1, Decl. = -31o13'52".5 +/- 0".1 (equinox 2000.0), which is 47".2 west and 2".5 south of the nucleus of MCG -05-16-21. SUPERNOVA 2001em IN UGC 11794 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." COMET C/2003 H1 (LINEAR) Visual total-magnitude estimates: Jan. 20.23 UT, 13.3 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector); 25.86, 13.0 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector); Feb. 1.23, 12.7 (Gonzalez). (C) Copyright 2004 CBAT 2004 February 5 (8282) Daniel W. E. Green
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