Electronic Telegram No. 3430
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 2013ah IN UGC 5201 = PSN J09443380+5545444
     Li Zhou, Xiaofeng Wang, and Juncheng Chen, Tsinghua University (THU);
Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC), report the discovery of an apparent supernova (mag 18.6) on
unfiltered CCD images taken on Feb. 22.60 UT using the 0.6-m NAOC Schmidt
telescope in the course of the THU-NAOC Transient Survey (TNTS).  The new
object is located at R.A. = 9h44m33s.80, Decl. = +55d45'44".4 (equinox
2000.0), which is 18".0 west and 1".6 south of the center of the galaxy UGC
5201.  Nothing is visible at this position on archival images obtained on
Feb. 19 (limiting mag about 20.0) or on a Digitized Sky Survey image from the
Palomar Sky Survey.  The TNTS images are posted at the following website URL:
http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ09443380+5545444.png.
The variable was designated PSN J09443380+5545444 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013ah based on the
spectroscopic confirmation reported below.  L. Elenin (Lyubertsy, Russia) and
I. Molotov (Moscow, Russia) measured magnitude 18.4 and position end figures
33s.98 +/- 0".06, 43".8 +/- 0".1 for 2013ah using UCAC-4 reference stars,
from co-added unfiltered CCD images (limiting mag about 19.6) taken remotely
with a 0.45-m f/2.8 telescope at the ISON-NM Observatory near Mayhill, NM,
USA, on Feb. 23.410; they have posted an image at the following website URL:
http://spaceobs.org/images/TOCP/PSNJ09443380+5545444-20130223.png.

     Jinghua Gao and Xiaofeng Wang, Tsinghua University (THU); and Tianmeng
Zhang, National Astronomical Observatories of China (NAOC), report on an
optical spectrogram (range 350-880 nm) of PSN J09443380+5545444 = SN 2013ah
that was obtained on Mar. 1.66 UT with the 2.16-m telescope (+ BFOSC) at the
Xinglong Station of the NAOC.  The spectrum is consistent with a type-Ia
supernova a few days before 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 2013ah matches with SN 2000dn at
-8 days.  Adopting a redshift of 0.0254 for the presumed host galaxy, UGC
5201 (Springob et al. 2005, Ap.J. Suppl. 160, 149), they measure the velocity
of the Si II 635.5-nm absorption feature to be about 11200 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 March 4                     (CBET 3430)              Daniel W. E. Green