Electronic Telegram No. 3769
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 2013hr IN NGC 5818 = PSN J14590085+4948476
     Pavel Balanutsa has discovered an apparent supernova (mag 16.2) on
unfiltered 60-s MASTER-Amur survey CCD images (limiting mag 17.8) taken on
2013 Dec. 26.798 UT.  The new object is located at R.A. = 14h59m00s.85, Decl.
= +49d48'47".6, which is 24" east and 29" south of the center of the galaxy
NGC 5818.  D. Denisenko and E. Gorbovskoy add that nothing is present at this
position on a MASTER-Amur reference image taken on 2011 Mar. 24.7 (limiting
magnitude 19.7).  The discovery and reference images have been posted at URL
http://master.sai.msu.ru/static/OT/145900.85494847.6.png.  The variable was
designated PSN J14590085+4948476 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2013hr based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2013hr:  2013 Dec.
28.517, 17.2 (L. Elenin, Lyubertsy, Russia, and I. Molotov, Moscow, Russia;
remotely using a 0.4-m f/3 telescope at the ISON-NM Observatory near Mayhill,
NM, U.S.A.; position end figures 00s.76 +/- 0".11, 47".4 +/- 0".06; UCAC-4
reference stars; limiting mag about 20.0; red magnitude; image posted at URL
http://spaceobs.org/images/TOCP/PSNJ14590085+4948476-20131228.png); 28.544,
17.6 (Joseph Brimacombe, Cairns, Australia; remotely with a 51-cm RCOS
telescope + STXL-6303 camera at the New Mexico Skies observatory near Mayhill;
position end figures 00s.76, 47".2; images posted at website URL
http://www.flickr.com/photos/43846774@N02/11680859094/).

     Tianmeng Zhang, National Astronomical Observatories of China (NAOC); and
Xulin Zhao and Xiaofeng Wang, Tsinghua University, report on an optical
spectrogram (range 370-860 nm) of PSN J14590085+4948476 = 2013hr that was
obtained on 2013 Dec. 27.91 UT with the 2.16-m telescope (+ BFOSC) at the
Xinglong Station of the NAOC.  The spectrum is consistent with that of a
type-Ia supernova two weeks after maximum light.  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that it matches with SN 2005am
at +15 days.  Adopting for the host galaxy (NGC 5818) a recession velocity of
7852 km/s (after Falco 1999, PASP 111, 438), they measure a velocity of the
Si II 635.5-nm absorption feature to be about 10700 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 January 3                   (CBET 3769)              Daniel W. E. Green