Electronic Telegram No. 3994
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 2014dk = PSN J00281196+0709439
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; M. Catelan, Pontificia Universidad
Catolica de Chile; S. M. Larson and E. Christensen, Lunar and Planetary
Laboratory, University of Arizona, report the Catalina Real-time Transient
Survey discovery of an apparent supernova in unfiltered Catalina Sky Survey
(CSS) images:

 SN       2014 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2014dk   Sep. 25.36   0 28 11.96  + 7 09 43.9   17.0    1".9 W, 3".8 N

The variable was designated PSN J00281196+0709439 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2014dk based on the
spectroscopic confirmation reported below.  Additional unfiltered CCD
magnitudes for 2014dk:  June 26.44, [20.0 (CSS); Sept. 29.022, 16.7 (G. Masi
and P. Catalano; remotely using a 43-cm telescope at Ceccano, Italy; position
end figures 11s.98, 43".9).

     L. Tomasella, N. Elias-Rosa, P. Ochner, L. Tartaglia, S. Benetti, E.
Cappellaro, A. Pastorello, and M. Turatto, Osservatorio Astronomico di Padova,
Istituto Nazionale di Astrofisica, report that optical spectroscopy (range
340-820 nm; resolution 1.3 nm), obtained on Sept. 27.06 UT with the Asiago
1.82-m Copernico Telescope (+ AFOSC) under the Asiago Transient Classification
Program (Tomasella et al. 2014, A.N. 335, 841), shows that PSN
J00281196+0709439 = 2014dk is a type-Ia supernova at a redshift of about
0.038.  A good match is found with several normal type-Ia supernovae about ten
days before maximum light.  The expansion velocity, as deduced from the
position of the minimum of the Si II 635.5-nm absorption, is around 10900
km/s.  Classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488,
383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).  The Asiago
classification spectra are posted at website URL http://graspa.oapd.inaf.it.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 September 30                (CBET 3994)              Daniel W. E. Green