[IAUC] CBET 2962: 20111229 : SUPERNOVA 2011jm IN NGC 4809 = TCP J12545110+0239149

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2962
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 2011jm IN NGC 4809 = TCP J12545110+0239149
     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;
J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad
Catolica de Chile; R. H. McNaught and G. Garradd, Australian National
University; 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 Catalina Sky
Survey (CSS).

 SN       2011 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2011jm   Dec. 24.49   12 54 51.10  + 2 39 14.9   14.8    0".6 E, 0".2 N

The variable was designated TCP J12545110+0239149 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011jm based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2011jm (unfiltered unless noted otherwise:  June 24.18 UT, [19.0 (CSS);
Dec. 27.489, 15.4 (J. 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 51s.14, 15".1);
12.168, 15.6 (F. Luppi and L. Buzzi, Varese, Italy; 0.38-m f/6.8 reflector;
position end figures 51s.11, 15".2; reference stars from CMC-14 catalogue;
image posted at website URL http://www.astrogeo.va.it/pub/TOCP/TCP_N4809.jpg);
28.403, 15.5 (S. Baroni, L. Buzzi, P. Concari, S. Foglia, G. Galli, and M.
Tombelli; remotely using a 0.18-m f/2.8 reflector at the Tzec Maun Observatory
near Mayhill, NM, U.S.A.).  Brimacombe's image is posted at the following
website URL:  http://www.flickr.com/photos/43846774@N02/6585388995/.

     R. J. Foley and W. Fong, Harvard-Smithsonian Center for Astrophysics,
report that they have obtained a spectrogram (range 400-1000 nm) of TCP
J12545110+0239149 = SN 2011jm on Dec. 27.3 UT with the Magellan Baade
telescope (+ IMACS).  The spectrum shows that 2011jm appears to be a type-Ic
supernova 2-4 months after maximum light, but it is not fully nebular.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 December 29                 (CBET 2962)              Daniel W. E. Green