[IAUC] CBET 3809: 20140219 : SUPERNOVA 2014R IN UGC 5055 = PSN J09301230+5551135

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                                                  Electronic Telegram No. 3809
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 2014R IN UGC 5055 = PSN J09301230+5551135
     [Editor's note:  this text replaces that on CBET 3808 (discovery details
corrected by discoverers).]
     Li Zhou, Juncheng Chen, and Xiaofeng Wang Tsinghua University (THU);
and Tianmeng Zhang, National Astronomical Observatories of China (NAOC),
report the discovery of an apparent supernova (mag 18.3) on unfiltered CCD
images taken on Feb. 8.73 UT using the 0.6-m NAOC Schmidt telescope in the
course of THU-NAOC Transient Survey (TNTS).  The new object is located at
R.A. = 9h30m12s.30, Decl. = +55d51'13".5 (equinox 2000.0), which is 8".2 east
and 4".8 north of the center of the galaxy UGC 5055.  Nothing is visible at
this position on archival images obtained on Jan. 7 (limiting mag about 20.0)
or on a Digitized Sky Survey image.  The TNTS images are posted at website
URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ09301230+5551135.png.
     The variable was designated PSN J09301230+5551135 when it was posted at
the Central Bureau's TOCP webpage and is here designated SN 2014R based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2014R:  Feb. 7.02 UT, [19.0 (Giancarlo Cortini, Predappio, Italy; 35-cm f/5.5
Schmidt-Cassegrain reflector + SXVR H-9 camera); 9.90, 17.5 (Cortini; limiting
mag 18.5); 12.406, 17.7 (Joseph Brimacombe, Cairns, Australia; remotely with
a 43-cm CDK telescope + STL-6303 camera at the New Mexico Skies observatory
near Mayhill, New Mexico, USA; position end figures 12s.31, 13".4; image
posted at URL http://www.flickr.com/photos/43846774@N02/12508891745/); 12.972,
16.9 (Gianluca Masi, Francesca Nocentini, and Patrick Schmeer; remotely using
a 43-cm telescope near Ceccano, Italy; position end figures 12s.28, 13".3).

     J.-J. Zhang, Yunnan Astronomical Observatory (YNAO); and X.-F. Wang,
Tsinghua University, report on an optical spectrogram (range 340-890 nm) of
PSN 09301230+5551135 = SN 2014R that was obtained on Feb. 13.62 UT with the
2.4-m telescope (+ YFOSC) at the LiJiang Gaomeigu Station of the YNAO.  The
spectrum is consistent with a 1991T-like type-Ia supernova at about one week
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 2014R matches with SN 1997br at -7 days.  The spectrum
is very blue with prominent absorptions of Fe III and Fe II lines.  Adopting
a recession of 7550 km/s for the host galaxy, UGC 5055 (Springob 2005, Ap.J.
Suppl. 160, 149), they measure a velocity of the Si II 635.5-nm absorption
feature to be about 12300 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 February 19                 (CBET 3809)              Daniel W. E. Green