| SUPERNOVAE
2010iu AND 2010iv
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier,
and F. Forster, Universidad de Chile; G. Pignata and
M. Cifuentes, Universidad Andres Bello; P. Gonzalez,
Pontificia Universidad Catolica de Chile; B. Conuel,
Wesleyan University; G. Folatelli, Institute for the
Physics and Mathematics of the Universe (IPMU), University
of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A.
Crain, D. Foster, M. Nysewander, and A. LaCluyze, University
of North Carolina at Chapel Hill, on behalf of the CHASE
project, report the discovery of an apparent supernova
(mag approximately 17.4) on unfiltered images taken
on Oct. 15.26 and 16.09 UT with the 0.41-m 'PROMPT 1'
telescope located at Cerro Tololo. The object, designated
SN 2010iv, is located at R.A. = 4h03m52s.23 +/- 0".2,
Decl. = -43°25'38".5 +/- 0".2 (equinox 2000.0); it is
right on the top of the small galaxy and completely
dominating the visible light. Nothing is visible at
this position on a stack of seventeen 40-s archival
images taken between 2009 Nov. 5.13 and 2010 Aug. 13.28
(limiting mag 19.5).
G. Pignata, Universidad Andres Bello; and G. Folatelli,
IPMU, University of Tokyo, on behalf of the Millennium
Center for Supernova Science, report on optical spectroscopy
(range 355-890 nm) of 2010iv (see above) and the object
announced on CBET 2499 (and now designated 2010iu),
obtained with the SOAR 4.3-m telescope (+ Goodman HTS)
on Oct. 16.3 UT. The spectra show both objects to be
normal type-Ia supernovae, a few days before maximum.
Following cross-correlation with a library of supernova
spectra using SNID (Blondin and Tonry 2007, Ap.J. 666,
1024), 2010iv is found to be most similar to SN 2003du
at three days before maximum; SNID also provides a best-fit
redshift of 0.074 for 2010iv. SN 2010iu is most similar
to SN 1992A at five days before maximum (via SNID).
The Si II 597.2-nm line appears stronger in SN 2010iu
than in SN 1992A. SNID also provides a best-fit redshift
of 0.040 for SN 2010iu. .
NOTE: These 'Central Bureau Electronic Telegrams' are
sometimes superseded by text appearing later in the
printed IAU Circulars.
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