[IAUC] CBET 2897: 20111103 : SUPERNOVA 2011hn IN UGC 4747 = PSN J09031745+3035364

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                                                  Electronic Telegram No. 2897
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 2011hn IN UGC 4747 = PSN J09031745+3035364
     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
 2011hn   Oct. 3.48    9 03 17.45  +30 35 36.4   17.8    35".5 E, 7".6 N

This variable was designated PSN J09031745+3035364 when it was posted on the
Central Bureau's TOCP webpage and is here designated SN 2011hn based on the
spectroscopic confirmation reported below.  Further unfiltered CCD magnitudes
for 2011hn:  Apr. 30.22 UT, [18.7 (CSS); Oct. 6.464 (Joseph Brimacombe, Cairns,
Australia; position end figures 17s.42, 41".0); 10.438, 17.3 (Brimacombe);
14.48, 17.4 (Brimacombe); 19.497, 17.3 (Brimacombe).  Brimacombe's Oct. 6
image is posted at URL http://www.flickr.com/photos/43846774@N02/6222045988/;
his Oct. 10 image is at http://www.flickr.com/photos/43846774@N02/6233343508/;
his Oct. 14 image is at http://www.flickr.com/photos/43846774@N02/6247340829/;
his Oct. 19 image is at http://www.flickr.com/photos/43846774@N02/6262398655/.

     L. Tomasella, S. Valenti, A. Pastorello, M. Fiaschi, and S. Benetti,
Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on
behalf of a larger collaboration, report that a spectrogram of PSN
J09031745+3035364 = SN 2011hn was obtained on Oct. 31.08 UT with the Ekar-
Copernico 1.82-m telescope (+ AFOSC; range 380-820 nm; resolution 2.2 nm).
A comparison of the observed spectrum with a library of supernova spectra
using the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383) suggests
that 2011hn is a normal type-IIP supernova about 3 weeks after the explosion.
The spectrum shows prominent P-Cyg H and Fe II features.  The expansion
velocity, as deduced from the position of the minimum of H_alpha, is about
7200 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 November 3                  (CBET 2897)              Daniel W. E. Green