Electronic Telegram No. 3540
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 2013cu IN UGC 9379 = PSN J14335897+4014207
     Denis Denisenko, Sternberg Astronomical Institute (SAI), reports the
discovery of an apparent supernova (magnitude 15.7) by S. Shurpakov on two
unfiltered 60-s survey images (limiting mag 18.3) obtained with the
MASTER-Kislovodsk robotic telescope (double 0.40-m f/2.5 reflector) on May
5.922 and 5.928 UT.  The new object is located at R.A. = 14h33m58s.97, Decl. =
+40o14'20".7 (equinox 2000.0), which is 4" east and 20" south of the center of
the galaxy UGC 9379.  Denisenko and E. Gorbovskoy find that nothing was
visible at this position on MASTER-Kislovodsk images from Apr. 5.948 and 5.979
(limiting mag 18.9).  The discovery and reference images are available at URL
http://master.sai.msu.ru/static/OT/143358.97401420.7.jpg; animated images are
posted at URL http://master.sai.msu.ru/static/OT/PSNinUGC9379-anim.gif.
The variable was designated PSN J14335897+4014207 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013cu based on the
spectroscopic confirmation reported below.  K. Sarneczky (Konkoly Observatory,
Piszkesteto, Hungary; 0.60-m Schmidt telescope) reports magnitude R = 17.0
+/- 0.1 and position end figures 58s.87, 22".9 on May 7.877.

     L. Tomasella, S. Benetti, A. Pastorello, E. Cappellaro, P. Ochner, and M.
Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that an optical spectrogram of PSN J14335897+4014207 = SN
2013cu (range 340-820 nm; resolution 1.3 nm), obtained on May 8.96 UT with the
Asiago 1.82-m Copernico Telescope (+ AFOSC), shows a featureless blue
continuum.  This suggests that 2013cu is likely a very young core-collapse
supernova.  The Asiago classification spectra are posted at website URL
http://graspa.oapd.inaf.it; classification was made via GELATO (Harutyunyan
et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666,
1024).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 June 3                      (CBET 3540)              Daniel W. E. Green