Electronic Telegram No. 837
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)
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SUPERNOVA 2007T IN NGC 5828
     S. Benetti, A. Harutyunyan, M. Turatto, and E. Cappellaro, Istituto
Nazionale di Astrofisica, Osservatorio Astronomico di Padova; and A.
Magazzu', Telescopio Nazionale Galileo (TNG), report that a spectrum of
2007T (cf. CBET 833), obtained on Feb. 7.21 UT with the 3.5-m TNG (+
DOLORES; range 330-810 nm, resolution 1.8 nm), shows it to be a type-II
supernova caught a few days after explosion.  The spectrum consists of a
blue continuum (T_bb about 12700 K) superimposed by P-Cyg profiles of
H-beta, H-gamma, and He I 587.5-nm lines.  H-alpha is present, mostly
with a broad (FWHM about 10400 km/s) emission profile.  Adopting a
recession velocity of 4071 km/s of the parent galaxy (from the Sloan
Digital Sky Survey data release 3, via NED), the expansion velocity
deduced from the H-beta minimum is about 9600 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 February 7                  (CBET 837)               Daniel W. E. Green