[IAUC] CBET 2945: 20111219 : SUPERNOVA 2011iz = PSN J03213648+2233461

Lun Dic 19 03:19:16 ART 2011

                                                  Electronic Telegram No. 2945
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 2011iz = PSN J03213648+2233461
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; J. L. Prieto, Princeton University; M.
Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M.
Larson, Lunar and Planetary Laboratory, University of Arizona; and E.
Christensen, Gemini Observatory, report the discovery of an apparent supernova
in unfiltered Mount Lemmon Survey (MLS) images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011iz   Nov. 30.26   3 21 36.48  +22 33 46.1   17.6    0".1 W, 15".3 S

The variable was designated PSN J03213648+2233461 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011iz based on the
spectroscopic confirmation reported below.  Further CCD magnitudes for 2011iz
(unfiltered unless noted otherwise):  Oct. 20.43 UT, [20.5 (MLS); Dec. 1.475,
18.2 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS
telescope + STL11K camera + luminance filter at New Mexico Skies Observatory
near Mayhill, NM, U.S.A.; position end figures 36s.49, 45".7; image posted at
website URL http://www.flickr.com/photos/43846774@N02/6438246969/); 4.323,
17.2 (L. Elenin, Lyubertsy, Russia; three 300-s images remotely taken at the
ISON-NM Observatory near Mayhill with a 0.45-m f/2.8 telescope + KAF09000 CCD
chip; position end figures 36s.47 +/- 0".1, 46".6 +/- 0".1; reference stars
from the NOMAD catalogue; stars; limiting mag about 19.8; image posted at URL
http://spaceobs.org/images/TOCP/PSNJ03213648+2233461-20111204.png); 6.948,
17.8 (S. Foglia and G. Galli, Pogliano Milanese, Italy; 0.28-m f/6.8 Schmidt-
Cassegrain reflector + ST8XME camera; position end figures 36s.49, 46".3;
UCAC-2 reference stars); 10.988, 18.9 (Federica Luppi, Varese, Italy; 0.35-m
f/7.9 reflector + Bessell-R filter; position end figures 36s.47, 46".4;
reference stars from CMC-14 catalogue).

     L. Tomasella, S. Benetti, A. Pastorello, S. Valenti, and F. Bufano,
Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on
behalf of a larger collaboration, report that a spectrogram of PSN
J03213648+2233461 = SN 2011iz, obtained on Dec. 15.93 UT with the Asiago
1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm; resolution 2.4 nm),
shows it to be a type-Ia 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 2011iz is similar to SN
1989B (Barbon et al. 1990, A.Ap. 237, 79) about two weeks after maximum light,
if a redshift of 0.038 is assumed for the host galaxy.

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

                         (C) Copyright 2011 CBAT
2011 December 19                 (CBET 2945)              Daniel W. E. Green