[IAUC] CBET 3352: 20121223 : SUPERNOVA 2012hv IN NGC 4681 = PSN J12472930-4319443

Sab Dic 22 22:03:20 ART 2012

                                                  Electronic Telegram No. 3352
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 en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012hv IN NGC 4681 = PSN J12472930-4319443
     R. Antezana, P. Sanchez, M. Hamuy, L. Gonzalez, R. Cartier, F. Forster,
S. Silva, F. Carrasco, C. Hervias, and R. Ramirez, Universidad de Chile; G.
Pignata, M. Cifuentes, and Y. Apostolovski, 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 16.1) on an unfiltered image
taken on Dec. 16.32 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro
Tololo.  The new object is located at R.A. = 12h47m29s.30 +/- 0".2, Decl. =
-43o19'44".3 +/- 0".2 (equinox 2000.0), which is about 5".5 east and 21".2
north of the center of the galaxy NGC 4681.  Nothing is visible at this
position on archival images taken on July 8.10 (limiting mag 18.5).  The
variable was designated PSN J12472930-4319443 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012hv based on the
spectroscopic confirmation reported below.  Joseph Brimacombe, Cairns,
Australia, writes that a stacked image of 2012hv taken with a 41-cm RCOS
telescope (+ infrared filter; bandpass > 700 nm) yields mag 16.9 and position
end figures 29s.28, 44".0; his image is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/8293368430/.

     D. Milisavljevic, Harvard-Smithsonian Center for Astrophysics; R. Fesen,
Dartmouth College; T. Pickering, A. Kniazev, and A. Gulbis, South African
Astronomical Observatory and Southern African Large Telescope; and G. Pignata,
Universidad Andres Bello, report that low-dispersion spectra (range 330-890
nm), obtained on Dec. 21.1 UT with the 10-m SALT telescope (+ RSS), show PSN
J12472930-4319443 = SN 2012hv to be an old 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
good matches with the type-IIP event 2004et at approximately three months
after maximum light.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2012 CBAT
2012 December 23                 (CBET 3352)              Daniel W. E. Green