Electronic Telegram No. 3170
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


SUPERNOVA 2012dl IN ESO 459-6 = PSN J19120821-3207370
     G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F.
Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez,
Universidad de Chile; F. Aros, Pontificia Universidad Catolica de Chile; B.
Conuel, Wesleyan University; G. Folatelli, 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 (which is part of the Millennium Center for Supernova Science
collaboration), report the discovery of an apparent supernova (mag
approximately 16.3) on an unfiltered image taken on June 6.16 UT with the
0.41-m 'PROMPT 3' telescope located at Cerro Tololo.  The new object is
located at R.A. = 19h12m08s.21 +/- 0".2, Decl. = -32o07'37".0 +/- 0".2
(equinox 2000.0), which is about 7".9 west and 1".8 south of the center of
the galaxy ESO 459-6.  The variable was designated PSN J19120821-3207370
when it was posted at the Central Bureau's TOCP webpage and is here designated
SN 2012dl based on the spectroscopic confirmation reported below.  Additional
magnitudes for 2012dl:  2011 Mar. 25.32-2012 May 24.23, [20.0 (stack of
fifteen 40-s CHASE images); 2012 May 24.23, [18.0 (CHASE); June 7.13, 16.4
(CHASE); 9.703, 18.5 (Joseph Brimacombe, Cairns, Australia; image taken with
infrared filter; position end figures 08s.18, 37".5; image posted at website
URL http://www.flickr.com/photos/43846774@N02/7356060622/); 18.716, 18.7
(Brimacombe; position end figures 08s.31, 37".1; image posted at website URL
http://www.flickr.com/photos/43846774@N02/7496901246/).

     G. Pignata, Universidad Andres Bello; and T. De Jaeger, Universidad de
Chile, on behalf of the Millennium Center for Supernova Science collaboration,
report that a low-dispersion spectrogram (range 370-940 nm) of PSN
J19120821-3207370 = SN 2012dl, obtained on June 23.1 UT with the 6.5-m Magellan
II Clay telescope (+ LDSS3), shows that it is a type-Ia supernova.  Cross-
correlation with a library of supernova spectra using the Supernova
Identification Code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) gives a
good match with SN 1994D at three weeks after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 July 8                      (CBET 3170)              Daniel W. E. Green