[IAUC] CBET 2668: 20110307 : SUPERNOVA 2011an IN UGC 4139 = PSN J07592442+1625082

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                                                  Electronic Telegram No. 2668
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 2011an IN UGC 4139 = PSN J07592442+1625082
     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, Carnegie Observatories; 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 Catalina Real-time Transient Survey's discovery of an apparent
supernova in public images from the Catalina Sky Survey.

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011an   Mar. 1.19    7 59 24.42  +16 25 08.2   18.4    11".6 E, 8".5 S

This object was designated PSN J07592442+1625082 when posted on the Central
Bureau's TOCP webpage and is here designated SN 2011an based on the
spectroscopy reported below.  Further unfiltered CCD magnitudes for 2011an:
Jan. 28.26 UT, [20.5 (Mt. Lemmon Survey); Mar. 2.13, 16.9 (Howerton, 0.2-m
telescope); Mar. 3.269, 15.7 (Joseph Brimacombe, Cairns, Australia; remotely
using a 51-cm RCOS telescope + STL11K camera at New Mexico Skies Observatory,
Mayhill, NM, U.S.A.; position end figures 24s.38, 09".1).  Brimacombe has
posted his image at URL http://www.flickr.com/photos/43846774@N02/5493974475/.
The presumed host galaxy is UGC 4139 = PGC 22391.

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf
of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of
PSN J07592442+1625082 = 2011an was obtained on Mar. 5 UT by M. Calkins with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-correlation with
a library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011an is a type-IIn
supernova, similar to SN 2001fa near maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 March 7                     (CBET 2668)              Daniel W. E. Green