Electronic Telegram No. 3814
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 2014S
     Masaomi Tanaka, National Astronomical Observatory of Japan; Hiroshi
Akitaya, Takahiro Ui, and Nana Ebisuda, Hiroshima University; Katsuhiko
Mameta, Hyogo, Japan; Satoru Fukuda, Hyogo, Japan; Tomoki Morokuma, Institute
of Astronomy, University of Tokyo; and Nozomu Tominaga, Konan University,
on behalf of the Kiso Supernova Survey collaboration, report the discovery of
an apparent supernova (mag 18.8) on a g-band CCD image (limiting mag 20.3)
taken on Feb. 21.50 UT with the Kiso Wide Field Camera (field-of-view 2.1 deg
x 2.1 deg) on the 1.05-m Kiso Schmidt telescope at the Kiso Observatory.  The
new object is located at R.A. = 10h40m24s.98, Decl. = +53d57'58".6 (equinox
2000.0), which is 6".6 west and 5".4 north of the presumed host galaxy (SDSS
J104025.73+535753.2).  Nothing is seen at this position in an image taken on
Jan. 31.60 (limiting mag 20.1).  The variable was also detected with the
Kanata 1.5-m telescope (+ HONIR) at Hiroshima, Japan, with the following
magnitudes measured:  Feb. 22.56, J = 18.7; 22.57, R_c = 18.4.

     E. S. Walker, Yale University; P. A. Mazzali, Liverpool John Moores
University, Max-Planck-Institut fuer Astrophysik, Garching, and Istituto
Nazionale di Astrofisica (INAF), Padova; and E. Pian, Scuola Normale
Superiore, Pisa, and Istituto di Astrofisica Spaziale e Fisica Cosmica, INAF,
Bologna, report that they obtained a CCD spectrogram (range 350-800 nm) of
2014S using the DOLORES spectrograph on the Telescopio Nazionale di Galileo
at La Palma on Feb. 25.14 UT.  The spectrum is that of a type-II supernova.
The spectrum shows a strong blue continuum with faint emission lines of
H_gamma, H_delta, and He I, corresponding to a redshift of 0.04.  Using the
Gelato code (Harutyunyan et al. 2008, A.Ap. 488, 383), the best matches to the
spectrum of 2014S are to normal type-II and some type-IIn supernovae at
approximately 20 days after explosion.  Due to the faint emission lines,
distinguishing between a type-II or a type-IIn event is difficult.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 March 2                     (CBET 3814)              Daniel W. E. Green