[IAUC] CBET 1062: 20070912 : SUPERNOVA 2007il IN IC 1704

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                                                  Electronic Telegram No. 1062
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 2007il IN IC 1704
     Further to CBET 1048, J. Chu and W. Li report the discovery of an
apparent supernova on unfiltered KAIT images taken on Sept. 10.45 (at
mag 18.4) and 12.43 UT (mag 18.1).  The new object, designated 2007il,
is located at R.A. = 1h27m09s.75, Decl. = +14o46'46".5 (equinox 2000.0),
which is 3".5 east and 12".3 north of the nucleus of IC 1704.  A KAIT
image taken on Sept. 2.44 showed nothing at this location (limiting mag
19.3).
     S. Blondin, R. Kirshner, and P. Challis, Harvard-Smithsonian Center
for Astrophysics, report that a spectrum (range 350-740 nm) of 2007il,
obtained on Sept. 12.41 UT by P. Berlind with the F. L. Whipple
Observatory 1.5-m telescope (+ FAST), shows it to be a young type-II
supernova.  The spectrum consists of a featureless and blue continuum
with weak P-Cyg profiles of the Balmer series superimposed.  Adopting a
recession velocity of 6402 km/s for the host galaxy (from The Updated
Zwicky Catalog, http://tdc-www.harvard.edu/uzc/), the maximum absorption
in the H_alpha line (rest 656.3 nm) is blueshifted by roughly 14000 km/s.


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                         (C) Copyright 2007 CBAT
2007 September 12                (CBET 1062)              Daniel W. E. Green