Electronic Telegram No. 584
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)
URL http://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVAE 2006du AND 2006dx
     The "Nearby Supernova Factory" collaboration (N. Blanc, Y.
Copin, E. Gangler, and G. Smadja, Institut de Physique Nucleaire
de Lyon; G. Aldering, C. Aragon, S. Bailey, S. Bongard, M. J.
Childress, D. Kocevski, S. Loken, P. Nugent, S. Perlmutter, K.
Runge, R. Scalzo, R. C. Thomas, L. Wang, and B. A. Weaver, Lawrence
Berkeley National Laboratory, Berkeley; P. Antilogus, S. Gilles,
R. Pain, and R. Pereira, Laboratoire de Physique Nucleaire et de
Haute Energies de Paris; E. Pecontal and G. Rigaudier, Centre de
Recherche Astronomique de Lyon; R. Kessler, Kavli Institute for
Cosmological Physics, Chicago; and C. Baltay, A. Bauer, D. Herrera,
and D. Rabinowitz, Yale University) reports the discovery of a
supernova (mag approximately 19.2, calibrated to R) in NEAT images
(cf. CBET 263) obtained on July 19.34 UT using the Palomar Oschin
Schmidt telescope (+ QUEST II camera).  SN 2006dx is located
at R.A. = 21h10m34s.49, Decl. = -21o34'42".7 (equinox 2000.0).
A spectrogram (range 510-1000 nm), obtained with the Supernova
Integral Field Spectrograph (SNIFS) on the University of Hawaii
2.2-m telescope on July 23.45, reveals that 2006dx is a type-II
supernova at an approximate redshift of z = 0.035, as measured from
the peak of the observed H-alpha feature (in net emission).  A weak
P-Cyg He I 587.6-nm feature is also detected.
     SN 2006du (cf. IAUC 8733) was discovered independently in a
NEAT image from July 20.48 at an approximate magnitude of 17.2
(calibrated to R).  A SNIFS spectrum obtained July 23.60 reveals
that 2006du is also of type II, with both H-alpha and He I 587.6-nm
P-Cyg profiles; its host galaxy, IC 1529, has z = 0.023 (from the
HIPASS Final Catalog 2006, via NED).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 July 24                     (CBET 584)               Daniel W. E. Green