[IAUC] CBET 3601: 20130725 : SUPERNOVA 2013eh = PSN J16160919+3832530

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                                                  Electronic Telegram No. 3601
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 2013eh = PSN J16160919+3832530
     Tianmeng Zhang, National Astronomical Observatories of China (NAOC); and
Xiaofeng Wang and Juncheng Chen, Tsinghua University (THU), report the
discovery of an apparent supernova (mag 16.6) on unfiltered CCD images taken
on July 19.55 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. =
16h16m09s.19, Decl. = +38d32'53".0 (equinox 2000.0), which is 4".7 west and
8".0 north of the center of the galaxy SDSS J161609.48+383245.0.  Nothing is
visible at this position on a TNTS image taken on July 5 (limiting mag 20.0)
or on a digitized image from the Palomar Sky Survey.  The TNTS image is posted
at URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ16160919+383253.  The
variable was designated PSN J16160919+3832530 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013eh based on the
spectroscopic confirmation reported below.  Gianluca Masi and Francesca
Nocentini write that their unfiltered images taken remotely on July 21.907
with a 43-cm telescope at Ceccano, Italy, show 2013eh at mag 16.8; they
measure the position end figures to be 09s.18, 51".3.

     D. D. Balam, Dominion Astrophysical Observatory, National Research
Council of Canada; M. L. Graham, Las Cumbres Observatory Global Telescope,
University of California at Santa Barbara; and E. Y. Hsiao, Las Campanas
Observatory, report that a spectrogram (range 369-700 nm, resolution 0.3 nm)
of PSN J16160919+3832530 = SN 2013eh, obtained on July 21.29 UT with the
1.82-m Plaskett Telescope of the National Research Council of Canada, shows it
to be a type-Ia supernova about one week before maximum light.  Cross-
correlation with a library of supernova spectra using the "Supernova
Identification" code (Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that
2013eh is most similar to the type-Ia supernova 1999ee at eight days before
maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 July 25                     (CBET 3601)              Daniel W. E. Green