[IAUC] CBET 1069: 20070915 : SUPERNOVA 2007iu

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                                                  Electronic Telegram No. 1069
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT en CFA.HARVARD.EDU (science)
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SUPERNOVA 2007iu
     F. Yuan, J. Aretakis, and C. Akerlof, University of Michigan; and R.
Quimby, California Institute of Technology, on behalf of the ROTSE
collaboration, report the discovery of a supernova located at R.A. =
1h25m20s.11, Decl. = +8o54'12".7 (equinox 2000.0) in unfiltered CCD images
taken with the 0.45-m ROTSE-IIIb telescope at McDonald Observatory.  SN
2007iu, which is blended with a nearby USNO-catalogue star of mag 16.2 in
the ROTSE images, was at mag 19.0 +/- 0.4 mag on Sept. 8.24 UT and at mag
18.6 +/- 0.1 on Sept. 14.23; nothing was visible to limiting mag about 19.0
at this position in images taken on Sept. 7.95 by the ROTSE-IIIc telescope
at the H.E.S.S. site at Mt. Gamsberg, Namibia (the magnitudes are
unfiltered and calibrated relative to USNO-B1.0-catalogue R magnitudes).
No host galaxy is visible in the ROTSE images or on the Digitized Sky
Survey.  A finding chart of the supernova can be found at the following
URL:  http://www.rotse.net/transients/j0125+0854/070914_012520+085413.jpg.
     Quimby adds that a spectrum (420-890 nm) of 2007iu, obtained on Sept.
15.28 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution
Spectrograph) by M. Shetrone, V. Riley, and F. Deglman, shows it to be a
type-II supernova.  Emission lines from H-alpha, H-beta, and H-gamma are
detected, and a redshift of z = 0.09 is inferred from the line peaks.
Weak emission lines from He II 468.6-nm and possibly O III 500.7-nm are
also seen.  An emission peak is observed at rest wavelength 588 nm, which,
if identified with Na I, would imply a blueshift relative to the Balmer
lines of about 600 km/s.


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                         (C) Copyright 2007 CBAT
2007 September 15                (CBET 1069)              Daniel W. E. Green