[IAUC] CBET 3867: 20140508 : SUPERNOVA 2014ax IN UGC 10318 = PSN J16161816+6406063

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                                                  Electronic Telegram No. 3867
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 2014ax IN UGC 10318 = PSN J16161816+6406063
     T. Boles, Coddenham, England, reports the discovery of an apparent
supernova (mag 17.6) on unfiltered CCD images taken on May 3.972 and 4.943 UT
with a 0.35-m reflector.  The new object is located at R.A. = 16h16m18s.16,
Decl. = +64o06'06".3 (equinox 2000.0), which is approximately 2".0 east and
2".7 south of the center of UGC 10318.  Nothing is present at this position on
Digitized Sky Survey plates from 1991 May 31 (limiting red mag 20.5) and 1988
Mar. 24 (limiting blue mag 21.0).  The variable was designated PSN
J16161816+6406063 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2014ax based on the spectroscopic confirmation reported
below.  Additional CCD magnitudes for 2014ax:  2013 May 2, [19.5 (Boles);
July 17, [19.5 (Boles); 2014 May 5.862, 18.0 (Gianluca Masi; remotely using a
43-cm telescope near Ceccano, Italy; position end figures 18s.19, 04".5).

     D. Milisavljevic, R. Margutti, J. Parrent, A. Kamble, M. Drout, A.
Soderberg, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics; and E. O. Martin, MMT Observatory, report that a low-dispersion
spectrogram (range 335-855 nm), obtained on May 6.4 UT with the 6.5-m MMT
telescope (+ Blue Channel), shows PSN J16161816+6406063 = SN 2014ax to be a
type-II supernova.  Cross-correlation with a library of supernova spectra
using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J.
666, 1024) shows a reasonable match with the type-IIP event 1999gi at five
days before maximum light.  The spectrum exhibits features that are consistent
with a young age, including a blue continuum and shallow P-Cyg absorptions
associated with H Balmer lines.  After correcting for the redshift z = 0.0324
of the host galaxy (UGC 10318), as measured from coincident narrow H_alpha
emission, the minimum of the broad H_beta line absorption is blueshifted
approximately 8800 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 May 8                       (CBET 3867)              Daniel W. E. Green