Electronic Telegram No. 3776
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2013hu IN NGC 3693 = PSN J11280786-1311336
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata, Japan) of an apparent supernova (mag 17.4) on an
unfiltered CCD frame (limiting magnitude 18.5) taken on 2013 Dec. 28.858 UT
using a 0.50-m f/6.8 reflector at the Takanezawa station, Tochigi-ken.  The
new object is located at R.A. = 11h28m07s.86, Decl. = -13d11'33".6 (equinox
2000.0), which is 54" west and 7" north of the center of NGC 3693.  Itagaki
has posted the discovery image at URL http://www.k-itagaki.jp/images/3693.jpg.
The variable was designated PSN J11280786-1311336 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013hu based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013hu:  2011 Apr. 6.614, [19.0 (Itagaki; 0.60-m f/5.7 reflector; communicated
by Nakano); 2013 Dec. 29.66, 17.3 (Toshihide Noguchi, Katori, Chiba-ken, Japan;
0.23-m reflector + BITRAN BT-11E camera; eight stacked 30-s frames; limiting
mag 18.0; position end figures 07s.86, 33".4; offset 55" west, 7".5 north;
image posted at URL http://park8.wakwak.com/~ngc/images/PSNinNGC3693.jpg;
communicated by Nakano); 29.740, 17.5 (T. Yusa, Osaki, Japan; remotely using
an iTelescope 0.43-m f/6.8 astrograph + FLI ProLine PL4710 camera at Siding
Spring; limiting mag 19.0; position end figures 07s.84, 33".7; offset 55"
west, 6" north of the center of NGC 3693; UCAC4 reference stars; image posted
at URL http://space.geocities.jp/yusastar77/supernova/PSNinN3693_131229.htm).

     K. Ayani, Bisei Astronomical Observatory (BAO), Ibara, Okayama, Japan;
and H. Yamaoka, Kyushu University, obtained a low-resolution spectrogram
(range 400-800 nm; resolution 0.6 nm at H-alpha) of PSN J11280786-1311336 =
SN 2013hu with the BAO 1.01-m telescope on 2013 Dec. 30.9 UT.  The spectrum is
likely that of a type-II supernova, which is indicated by a broad and shallow
P-Cyg profile of H-alpha.  Cross-correlation with a library of supernova
spectra using the "SuperNova Identification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) shows that the spectrum of 2013hu matches with spectra
of type-IIP supernova at plateau phase -- among which, the best correlation is
found for the type-IIP supernova 2004et at three days before maximum.


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

                         (C) Copyright 2014 CBAT
2014 January 11                  (CBET 3776)              Daniel W. E. Green