[IAUC] CBET 2994: 20120125 : SUPERNOVA 2012Q IN ESO 366-18 = PSN J06462664-3653134

Mie Ene 25 04:22:10 ART 2012

                                                  Electronic Telegram No. 2994
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 2012Q IN ESO 366-18 = PSN J06462664-3653134
     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; C. Farias and 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 17.0) on unfiltered images taken on Jan. 14.13 and 16.13 UT
with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo.  The new object
is located at R.A. = 6h46m26s.64 +/- 0".2, Decl. = -36o53'13".4 +/- 0".2
(equinox 2000.0), which is about 0".6 east and 1".6 north of the center of
the galaxy ESO 366-18.  Nothing is visible at this position on archival images
taken on 2011 Nov. 6.16 (limiting mag 18.0) or in a stack of thirteen 80-s
images taken between 2011 Jan. 8.12 and Nov. 5.16 (limiting mag 20.1).
The variable was designated PSN J06462664-3653134 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012Q based on the
spectroscopic confirmation reported below.

     N. Elias-Rosa, Institut de Ciencies de l'Espai, Consejo Superior de
Investigaciones Cientificas; and G. Pignata, Universidad Andres Bello, on
behalf of a larger collaboration, report that a spectrum of PSN
J06462664-3653134 = SN 2012Q, obtained on Jan. 22.21 UT with the European
Southern Observatory's New Technology Telescope (+ EFOSC2; range 365-930 nm;
resolution 1.8 nm), shows it to be a type-Ic supernova.  The best fit to this
spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available
at website URL https://gelato.tng.iac.es/login.cgi) suggests that PSN
J06462664-3653134 is similar to the type-Ic supernova 1996bx at a couple of
weeks after explosion, if a redshift of 0.031669 for the host galaxy
(Theureau et al. 1998, A.Ap. Suppl. 130, 333; via NED) is assumed.  The overall
shape of the continuum is very red, implying that the supernova is heavily
extinguished [E(B-V) about 0.8] by dust.  In addition, the spectrum shows a
strong, narrow Na I D absorption at the velocity of the host galaxy with an
equivalent width of 0.46 nm.  The Schlegel et al. (1998, Ap.J. 500, 525) dust
maps indicate a value for Galactic reddening of E(B-V) = 0.146 mag.


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                         (C) Copyright 2012 CBAT
2012 January 25                  (CBET 2994)              Daniel W. E. Green