Circular No. 8091

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) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2003bt

     Further to IAUC 8090, M. Schwartz and P. R. Holvorcem report
     the LOTOSS (cf. IAUC 7906) discovery of a supernova (mag 16.7) on
     unfiltered Tenagra II CCD images taken on Mar. 9.3 and 10.3 UT.  SN
     2003bt is located at R.A. = 10h55m22s.48, Decl. = -7 39'12".3
     (equinox 2000.0), which is 11".9 west and 0".1 south of the host
     galaxy's nucleus.  An image taken on Feb. 2.4 showed nothing at
     this position (limiting mag about 18.5).  T. Matheson, P. Challis,
     and R. Kirshner, Harvard-Smithsonian Center for Astrophysics,
     report that a spectrum (range 370-750 nm) of SN 2003bt, obtained
     by M. Calkins on Mar. 11.25 UT with the Mt. Hopkins 1.5-m telescope
     (+ FAST spectrograph), shows it to be a type-Ia supernova, about 2
     weeks past maximum.

Host galaxy info: Vel = 8249 km/s, 0.6 x 0.6, 15.28

SN type info: Ia

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