[IAUC] CBET 2957: 20111228 : SUPERNOVA 2011jl IN NGC 3354 = PSN J10430295-3621524

Mie Dic 28 03:26:42 ART 2011

                                                  Electronic Telegram No. 2957
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 2011jl IN NGC 3354 = PSN J10430295-3621524
     G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; 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; 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 15.0) on an unfiltered image taken on Nov. 27.28
UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo.  The new
object is located at R.A. = 10h43m02s.95 +/- 0".2, Decl. = -36o21'52".4 +/-
0".2 (equinox 2000.0), which is about 0".5 east and 8".0 south of the center of
the galaxy NGC 3354.  The variable was designated PSN J10430295-3621524 when
it was posted at the Central Bureau's TOCP webpage and is here designated SN
2011jl based on the spectroscopic confirmation reported below.
     Additional CCD magnitudes for 2011jl (unfiltered unless otherwise
noted):  2010 Mar. 28.3-2011 Feb. 22.2 UT, [19.5 (eleven stacked CHASE images);
Apr. 30.03, [18.0 (CHASE); Nov. 29.35, 15.0 (CHASE); 30.522, 15.5 (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 02s.98, 51".4; image posted at website URL
http://www.flickr.com/photos/43846774@N02/6432698047/); Dec. 21.668, 15.3
(Brimacombe; infrared filter, bandpass > 700 nm; image posted at website URL
http://www.flickr.com/photos/43846774@N02/6558284013/).

     R. J. Foley and W. Fong, Harvard-Smithsonian Center for Astrophysics,
report that they have obtained a spectrogram (range 400-1000 nm) of PSN
J10430295-3621524 = SN 2011jl on Dec. 27.4 UT with the Magellan Baade
telescope (+ IMACS).  SN 2011jl appears to be a type-Ic supernova around 2-4
weeks after maximum light.  Cross-correlation with a library of supernova
spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) provides
reasonable matches with SN 1991N at 12 and 28 days after maximum brightness.


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                         (C) Copyright 2011 CBAT
2011 December 28                 (CBET 2957)              Daniel W. E. Green