[IAUC] CBET 2981: 20120119 : SUPERNOVA 2012E IN NGC 975 = PSN J02332279+0935056

Jue Ene 19 02:29:53 ART 2012

                                                  Electronic Telegram No. 2981
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 2012E IN NGC 975 = PSN J02332279+0935056
     L. Cox, J. Newton, and T. Puckett report the discovery of an apparent
supernova (mag 16.5) on an unfiltered CCD image (limiting mag 18.7) taken with
a 0.40-m reflector at Portal, AZ, U.S.A., on Jan. 14.142 UT in the course of
the Puckett Observatory Supernova Search.  The new object, which was confirmed
at mag 16.5 on Jan. 15.132 by Puckett with the 40-cm reflector at Portal, is
located at R.A. = 2h33m22s.79, Decl. = +09o35'05".6 (equinox 2000.0), which is
1".0 east and 60".5 south of the center of NGC 975.  Nothing is visible at
this position on images taken by Puckett on 2011 Dec. 28 (limiting mag 19.0).
The variable was designated PSN J02332279+0935056 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012E based on the
spectroscopic confirmation reported below.  The discoverers have posted an
image of 2012E at website URL http://www.possdata.com/PSNJ02332279+0935056.jpg.
Additional CCD magnitudes for 2012E (unfiltered unless noted otherwise):
Jan. 16.766, 16.4 (Paolo Corelli, Pagnacco, Italy; 0.45-m f/4.5 telescope;
limiting mag 19.0; position end figures 22s.81, 05".9; nothing visible at this
position on a red Palomar Sky Survey plate to limiting mag 21.0); 16.768, R =
15.5 +/- 0.1 (K. Sarneczky, Konkoly Observatory, Hungary; 1.02-m RCC
Telescope; position end figures 22s.80, 06".1; USNO-B1.0 reference stars);
16.836, 16.2 (Federica Luppi and Luca Buzzi Varese, Italy; 0.38-m f/6.8
reflector; position end figures 22s.82, 05".9; reference stars from CMC-14
catalogue; image posted at http://www.astrogeo.va.it/pub/TOCP/PSN_N975.jpg).

     L. Tomasella, E. Cappellaro, P. Ochner, S. Benetti, A. Pastorello, and
S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that a spectrum (range 360-810 nm; resolution 2.2 nm) of
PSN J02332279+0935056 = SN 2012E was obtained on Jan. 17.83 UT with the
Ekar-Copernico 1.82-m telescope (+ AFOSC).  Using a library of supernova
spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL
https://gelato.tng.iac.es/login.cgi), they found a best fit with a normal
type-Ia supernova few days before maximum.  Allowing for a galaxy redshift z
= 0.02 (de Vaucouleurs et al. 1991, RC3 catalogue; via NED), the expansion
velocity measured from the deep Si feature is 12500 km/s.


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

                         (C) Copyright 2012 CBAT
2012 January 19                  (CBET 2981)              Daniel W. E. Green