[IAUC] CBET 4193: 20151119 : SUPERNOVA 2015ar IN NGC 383 = PSN J01072038+3223598

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                                                  Electronic Telegram No. 4193
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2015ar IN NGC 383 = PSN J01072038+3223598
     E. Conseil and G. Arlic report the discovery of an apparent supernova
(mag 18.8) on fifty 240-s unfiltered CCD images (limiting magnitude 19.5)
obtained on Nov. 11.758 UT with a 0.2-m Newtonian telescope (+ Atik 383
camera) at Bommes, France.  The new object is located at R.A. = 1h07m20s.38,
Decl. = +32d23'59".8 (equinox J2000.0), which is 58" west and 46" south of
the center of the galaxy NGC 383.  The discovery image is posted at website
URL http://goo.gl/v98niC.  The variable was designated PSN J01072038+3223598
when it was posted at the Central Bureau's TOCP webpage and is here designated
SN 2015ar based on the spectroscopic confirmation reported below.  Additional
CCD magnitudes for 2015ar:  Nov. 10.778, 19.4 (Conseil and Arlic; pre-
discovery image; faint detection; image posted at URL https://goo.gl/H3bFdQ);
13.757, 16.7 (F. Kugel, Observatoire Chante-Perdrix, Dauban, France; 0.2-m
Schmidt-Cassegrain reflector + ST2000XM camera); 13.906, 17.5 (A. Mantero,
Bernezzo, Italy; 0.25-m f/4 reflector); 16.062, R = 16.1 (A. Klotz; 0.25-m
TAROT robotic telescope at Calern Observatory, France; limiting mag 17).

     L. Tartaglia, A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa,
P. Ochner, G. Terreran, L. Tomasella, and M. Turatto, Osservatorio Astronomico
di Padova, Istituto Nazionale di Astrofisica, report that an optical
spectrogram (range 340-820 nm; resolution 1.4 nm) of PSN J01072038+3223598 =
SN 2015ar, obtained on Nov. 16.92 UT with the Asiago 182-cm Copernico
Telescope (+ AFOSC) in the framework of the Asiago Transient Classification
Program (Tomasella et al. 2014, A.N. 335, 841), shows that this a type-Ia
supernova, about one week before maximum light.  The expansion velocity, as
deduced from the position of the minimum of the Si II 635-nm line, is about
12700 km/s.  The redshift adopted for NGC 383 is from Smith et al. (2000,
MNRAS 313, 469).  Classifications were done with 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 http://sngroup.oapd.inaf.it.


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

                         (C) Copyright 2015 CBAT
2015 November 19                 (CBET 4193)              Daniel W. E. Green