Electronic Telegram No. 3125
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 2012cl IN ESO 263-23 = PSN J10145093-4337488
     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; G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; 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 16.0 +/- 0.4)
on unfiltered images taken on May 10.99 and 11.99 UT with the 0.41-m 'PROMPT
3' telescope located at Cerro Tololo.  The new object is located at R.A. =
10h14m50s.93 +/- 0".2, Decl. = -43o37'48".8 +/- 0".2 (equinox 2000.0), which
is about 69".8 west and 40".2 south of the center of the galaxy ESO 263-23.
Nothing is visible at this position on archival images taken on May 4.01
(limiting mag 18.5) and in a stack of thirteen 80-s images taken between
2011 Apr. 1.14 and 2012 May 4.01 (limiting mag 20.5).  The variable was
designated PSN J10145093-4337488 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2012cl based on the spectroscopic
confirmation reported below.

     D. Milisavljevic, Harvard-Smithsonian Center for Astrophysics; R. Fesen,
Dartmouth College; and T. Pickering, South African Astronomical Observatory
and Southern African Large Telescope, report that low-dispersion spectra
(range 350-880 nm), obtained on May 24.8 UT with the 10-m SALT telescope (+
RSS), show PSN J10145093-4337488 = SN 2012cl to be a type-II supernova.
Cross-correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
reasonable matches to the type-IIP events SN 2004et and SN 1999em at about
ten days 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 May 26                      (CBET 3125)              Daniel W. E. Green