[IAUC] CBET 1173: 20071220 : SUPERNOVA 2007sr IN NGC 4038

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                                                  Electronic Telegram No. 1173
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2007sr IN NGC 4038
     H. Naito, Nishi-Harima Astronomical Observatory (NHAO); and Y. Sakane,
T. Anan, S. Kouzuma, and H. Yamaoka, Kyushu University, report that a low-
resolution (R about 400) spectrum of 2007sr (cf. CBET 1172) was obtained on
Dec. 19.87 UT with the 2.0-m NAYUTA telescope at NHAO, showing a somewhat-blue
continuum with broad absorption features (Si II and Fe II are prominent),
which suggests that it is a type-Ia supernova a few days before maximum.
The expansion velocity, derived from the Si II 635.5-nm absorption minimum,
is 12300 km/s.  Preliminary magnitudes from the images taken with the same
instrument are as follows:  Dec. 19.81, B = 13.42; 19.78, V = 12.86.


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                         (C) Copyright 2007 CBAT
2007 December 20                 (CBET 1173)              Daniel W. E. Green