Electronic Telegram No. 413
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 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


SUPERNOVA 2006an
     Further to IAUC 8622, R. Quimby and F. Castro, University of Texas,
report the discovery of an apparent supernova in unfiltered CCD images
taken on Feb 21.27 (at mag about 17.9) and 26.27 UT (mag about 17.7)
using the 0.45-m ROTSE-IIIb telescope at the McDonald Observatory (found
by subtracting a co-addition of images taken between 2004 Dec. 15 and
2005 June 8 with limiting mag about 19.0).  The new object is located
at R.A. = 12h14m38s.68, Decl. = +12o13'46".9 (equinox 2000.0; uncertainty
+/- 0".6), which is 0".9 west and 0".9 south of a galaxy of mag SDSS r =
21.9 and SDSS position end figures 38s.73, 47".7, although the galaxy
is not significantly detected in the ROTSE-IIIb data.  J. Maund (also
University of Texas) and Quimby add that a spectrum (420-890 nm),
obtained on Feb. 27.27 with the 9.2-m Hobby-Eberly Telescope (+ Marcario
Low-Resolution Spectrograph) by M. Shetrone and V. Riley, shows 2006an
to be a type-Ia supernova.  Taking a weak emission line at 698.0 nm to
be H-alpha from the host, they derive a redshift of z = 0.064.  The
spectrum is a good match to SN 1994D at 3 days after maximum (Patat et
al. 1996, MNRAS 278, 111).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 February 27                 (CBET 413)               Daniel W. E. Green