[IAUC] CBET 3897: 20140614 : SUPERNOVA 2014bn IN IC 1370 = PSN J21151330+0211224

Sab Jun 14 10:02:13 ART 2014

                                                  Electronic Telegram No. 3897
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 2014bn IN IC 1370 = PSN J21151330+0211224
     F. Ciabattari, E. Mazzoni, and G. Petroni, Borgo a Mozzano, Italy, report
their discovery of an apparent supernova (mag 17.6) on unfiltered CCD images
(limiting magnitude 19.5) obtained on June 8.04 and 8.97 UT with a 0.5-m
Newtonian telescope (+ FLI4710 Proline camera).  The new object is located at
R.A. = 21h15m13s.30, Decl. = +2d11'22".4 (equinox 2000.0; astrometry with
respect to UCAC-2 stars), which is 14" west and 8" south of the center of the
galaxy IC 1370.  Nothing is visible at this position on the digitized plates
of the Palomar Sky Survey from 1989 Sept. 18 (F plate; limiting mag 20.3) and
1990 July 23 (J plate; limiting magnitude 20.3).  The variable was designated
PSN J21151330+0211224 when it was posted at the Central Bureau's TOCP webpage
and is here designated SN 2014bn based on the spectroscopic confirmation
reported below.  Additional unfiltered CCD magnitudes for 2014bn:  June 9.021,
17.5 (G. Masi; remotely using a 43-cm telescope at Ceccano, Italy; position
end figures 13s.27, 22".4); 9.035, 18.2 (F. Luppi and L. Buzzi, Varese, Italy;
0.38-m f/6.8 reflector; position end figures 13s.26, 22".6; image posted at
website URL http://www.astrogeo.va.it/pub/TOCP/PSN_I1370.jpg).

     L. Tomasella, S. Benetti, A. Pastorello, E. Cappellaro, N. Elias-Rosa, P.
Ochner, and M. Turatto report that an optical spectrogram of PSN
J21151330+0211224 = SN 2014bn (range 340-820 nm; resolution 1.3 nm), obtained
on June 9.01 UT with the Asiago 182-cm Copernico Telescope (+ AFOSC) under the
Asiago Transient Classification Program (Tomasella et al. 2014, posted at URL
http://arxiv.org/abs/1403.7233), shows that 2014bn is a normal type-Ia
supernova.  Adopting for the host galaxy (IC 1370) a redshift z = 0.050
(Huchra et al. 1999, Ap.J. Suppl. 121, 28; via NED), a good match is found
with several normal type-Ia supernovae a few days before B-band maximum light.
An expansion velocity of about 11900 km/s is derived from the minimum of the
Si II 635-nm line.  The Asiago classification spectrum is posted at website
URL http://sngroup.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
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                         (C) Copyright 2014 CBAT
2014 June 14                     (CBET 3897)              Daniel W. E. Green