Electronic Telegram No. 2677
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVAE 2011au, 2011av, 2011aw, AND 2011ax
     J. L. Prieto, Carnegie Observatories; A. J. Drake, S. G. Djorgovski,
A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
M. Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M.
Larson, Lunar and Planetary Laboratory, University of Arizona; and E.
Christensen, Gemini Observatory, report the Catalina Real-time Transient
Survey's discovery of supernovae in unfiltered Catalina Sky Survey (CSS)
images:

 SN       2011 UT        R.A. (2000.0) Decl.      Mag.    Offset
 2011au   Mar.  5.21    9 33 41.55  +30 40 15.8   19.0     1" N
 2011av   Mar.  8.38   13 36 55.60  +21 57 42.2   17.6     1" N
 2011aw   Mar.  9.39   13 55 47.43  +21 11 26.7   19.0     1" W
 2011ax   Mar. 10.23    7 36 09.01  +47 27 15.5   18.3     1" S

Further CSS magnitudes for 2011au:  Feb. 6.27 UT, [20.5; Feb. 25.36, 19.5.
Further CSS magnitudes for 2011av:  Jan. 15.53, [19.2; Feb. 25.53, 18.8.
CSS limiting magnitude for 2011aw:  Jan. 15.53, [20.5.  CSS limiting magnitude
for 2011ax:  Feb. 11.19, [20.1.

     J. L. Prieto, Carnegie Observatories, reports that optical spectra (range
370-930 nm; resolution 0.7 nm) of 2011au, 2011av, 2011aw, and 2011ax were
obtained with the APO 3.5-m telescope (+ DIS) on Mar. 12.1 UT.  After cross-
correlation with a library of supernova spectra using SNID (Blondin and Tonry
2007, Ap.J. 666, 1024), the following spectral classes were identified:
2011au is a normal type-Ia supernova discovered around maximum light at z =
0.111; 2011av is a normal type-Ia supernova around maximum light at z = 0.054;
2011aw is a type-Ib/c supernova at z = 0.055; 2011ax is a normal type-Ia
supernova around maximum light at z = 0.062.  The redshifts were obtained
from host-galaxy emission lines for 2011au, 2011av, and 2011aw, and using SNID
for 2011ax.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 March 15                    (CBET 2677)              Daniel W. E. Green