[IAUC] CBET 2950: 20111224 : SUPERNOVA 2011je = PSN J04055376+1328129

Vie Dic 23 23:45:11 ART 2011

                                                  Electronic Telegram No. 2950
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 2011je = PSN J04055376+1328129
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A.
Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; 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 public images from the Mount Lemmon Survey:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011je   Nov. 27.39   4 05 53.76  +13 28 12.9   18.4    11".4 W, 2".4 S

The variable was designated PSN J04055376+1328129 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011je based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2011je (unfiltered unless noted otherwise):  Nov. 28.340 UT, 17.8 (R. A. Koff,
Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain reflector + Apogee
AP-47p camera; limiting magnitude 20.0; position end figures 53s.77, 11".0;
UCAC3 reference stars); 28.395, 18.7 (Joseph Brimacombe, Cairns, Australia;
remotely using a 51-cm RCOS telescope + STL11K camera + luminance filter at
the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end
figures 53s.85, 12".4); 28.477, R = 18.0 (P. Miller, P. Roche, A. Tripp, R.
Miles, R. Holmes, S. Foglia, and L. Buzzi with the 2.0-m f/10 "Faulkes
Telescope North" + Bessell R filter at Haleakala; seeing 1".2; position end
figures 53s.83, 12".6; image posted at the following website URL:
www.astrogeo.va.it/pub/TOCP/PSNJ04055376+1328129_FTN.jpg); Dec. 6.975, 17.3
(S. Foglia and G. Galli, Pogliano Milanese, Italy; 0.28-m f/6.8 Schmidt-
Cassegrain reflector + ST8-XME camera; position end figures 53s.79, 12".6;
UCAC-2 reference stars).  Brimacombe's image is posted at website URL
http://www.flickr.com/photos/43846774@N02/6423174897/.

     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
J04055376+1328129 = SN 2011je, obtained on Dec. 18.93 UT with the Asiago
1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm; resolution 2.4 nm),
shows it to be a peculiar type-II supernova most similar to SN 1994aj at a
phase of 43 days after maximum light (Benetti et al. 1998, MNRAS 294, 448).
The spectrum is dominated by a broad H-alpha emission (FWHM about 13000 km/s)
overimposed with a narrow (not resolved) feature with P-Cyg profile, from
which an expantion velocity of < 1100 km/s is deduced (the redshift of the
parent galaxy, 0.0174, has been derived from the peak of the narrow H-alpha
emission).

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

                         (C) Copyright 2011 CBAT
2011 December 24                 (CBET 2950)              Daniel W. E. Green