Electronic Telegram No. 117
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 2005ar
     Further to IAUC 8492, J. Graham and W. Li report the LOSS/KAIT
discovery of an apparent supernova on unfiltered KAIT images, located
at R.A. = 11h15m19s.03, Decl. = -3o46'18".5 (equinox 2000.0), which is
4".6 east and 5".6 north of the center of the apparent host galaxy.
Available approximate magnitudes:  Jan. 20.35 UT, [20.0; Feb. 10.35,
[18.5; Mar. 10.37, 17.7; 11.36, 17.6.
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian Center
for Astrophysics; and T. Matheson, National Optical Astronomy Observatory,
report that a spectrum (range 350-740 nm) of SN 2005ar, obtained by J.
Foster on Mar. 11.31 UT with the F. L. Whipple Observatory 1.5-m telescope
(+ FAST), reveals it to be a type-Ib supernova.  The spectrum is very
similar to spectra of SN 1998dt (Matheson et al. 2001, A.J. 121, 1648),
around one week after maximum brightness, and exhibits He I (rest 587.6
nm) in absorption; however, the other He I lines (rest 667.8, 706.5 nm)
are weak.  Further spectroscopy is encouraged to check and monitor the
evolution of the He I lines.


NOTE: These 'Central Bureau Electronic Telegrams' are intended to
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      formal IAU Circulars.  Citations should normally be made to IAUCs
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                         (C) Copyright 2005 CBAT
2005 March 12                    (CBET 117)               Daniel W. E. Green