Electronic Telegram No. 3995
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 2014dl IN UGC 10414 = PSN J16294609+0838306
     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
 2014dl   Sep. 25.11   16 29 46.09  + 8 38 30.6   16.5    18".0 W, 8".7 S

Nothing is visible at this position on a CSS image from Sept. 14.16 UT
(limiting mag 18.5).  The variable was designated PSN J16294609+0838306 when
it was posted at the Central Bureau's TOCP webpage and is here designated SN
2014dl based on the spectroscopic confirmation reported below.

     V. Nascimbeni, University of Padova; and L. Tomasella, A. Pastorello, S.
Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, and M. Turatto, Osservatorio
Astronomico di Padova, Istituto Nazionale di Astrofisica, report that an
optical spectrum (range 340-820 nm; resolution 1.3 nm), obtained on Sept.
27.75 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 J16294609+0838306 = SN 2014dl is a peculiar type-Ia supernova.
Assuming for the host galaxy (UGC 10414) a recessional velocity of 9883 km/s
(Falco et al. 1999, PASP 111, 438; via NED), the best fit is obtained with
the energetic supernova 1991T around one week before maximum light.  The
Classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383)
and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024); Asiago classification
spectra are posted at website URL http://sngroup.oapd.inaf.it.

     N. Morrell, C. Contreras, C. Gonzalez, and M. M. Phillips, Las Campanas
Observatory; E. Y. Hsiao, M. Stritzinger, C. Gall, and S. Holmbo, Aarhus
University; and P. Sanchez and P. Lira, Universidad de Chile, on behalf of the
Carnegie Supernova Project, report that an optical spectrogram (range 360-920
nm) of PSN J16294609+0838306 = SN 2014dl, obtained with the Las Campanas du
Pont telescope (+ WFCCD) on Sept. 27.0 UT, indicates that it is a peculiar
1991T-like type-Ia supernova.  Cross-correlation with a library of supernova
spectra using the "Supernova Identification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) shows that the spectrum of 2014dl is similar to that of
SN 1997br at 7 days before maximum.  The supernova redshift is consistent with
that of its presumed host galaxy, UGC 10414, at z = 0.03297 (Falco et al.
1999, PASP 111, 438; via NED).


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 3995)              Daniel W. E. Green