[IAUC] CBET 2948: 20111222 : SUPERNOVA 2011jc = PSN J03383439+2232595

Jue Dic 22 03:29:04 ART 2011

                                                  Electronic Telegram No. 2948
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 2011jc = PSN J03383439+2232595
     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
 2011jc   Nov. 30.26   3 38 34.39  +22 32 59.5   18.9    1".1 E, 16".7 N

The variable was designated PSN J03383439+2232595 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011jc based on the
spectroscopic confirmation reported below.  Additional reported CCD magnitudes
for 2011jc (unfiltered unless noted otherwise):  Sept. 29.48 UT, [21.0 (MLS);
Oct. 18.49, 19.6 (MLS); Dec. 4.336, 18.4 (L. Elenin, Lyubertsy, Russia; 0.45-m
f/2.8 telescope + KAF09000 chip, remotely taken at the ISON-NM Observatory
near Mayhill, NM, USA; position end figures 34s.39 +/- 0".1, 58".9 +/- 0".1;
NOMAD reference stars; limiting mag about 19.8; image posted at website URL
http://spaceobs.org/images/TOCP/PSNJ03383439+2232595-20111204.png); 10.961, R
= 18.2 (Federica Luppi, Varese, Italy; 0.35-m f/7.9 reflector + Bessell R
filter; position end figures 34s.37, 59".4; reference stars from CMC-14
catalogue); 19.900, 19.0 (S. Foglia and G. Galli, Pogliano Milanese, Italy;
0.28-m f/6.8 Schmidt-Cassegrain reflector + ST8-XME camera; position end
figures 34s.38, 59".6; UCAC 2.0 reference stars).

     D. Wright and M. Fraser, Queen's University, Belfast; L. Tomasella, A.
Pastorello, and S. Benetti, Istituto Nazionale di Astrofisica, Osservatorio
Astronomico di Padova; and E. Kankare and S. Mattila, University of Turku; on
behalf of a larger collaboration, report that low-S/N spectrograms of PSN
J03383439+2232595 = SN 2011jc, obtained on Dec. 16.01 and 18.92 UT with the
Asiago 1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm; resolution 2.4
nm), on Dec. 19.0 with the Nordic Optical Telescope (+ ALFOSC; range 320-910
nm; resolution 1.6 nm), and on Dec. 19.05 with the William Herschel Telescope
(+ ISIS; range 300-975 nm; resolution 1.2 nm) show that 2011jc is a type-IIn
supernova.  The best fits to these spectra found by GELATO (Harutyunyan et al.
2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi)
suggest that 2011jc is similar to SN 2005gj (comparison spectra are from
Padova-Asiago Supernova Archive) a few days after explosion, if a redshift of
0.087 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 22                 (CBET 2948)              Daniel W. E. Green