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SN 2014bm in NGC 6456 - 2014 06 06

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SN 2014bm (A.R., 17 42 32.16 Dec. +67 35 41.8), scoperta il 6 giugno 2014 nella galassia ngc 6456 (offset 2E 8N), magnitudine 17.4, tipo: Ia (ATEL 6210)

SN individuata da F. Ciabattari, E. Mazzoni and S. Donati con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).

 

            Electronic Telegram No. 3896

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.
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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2014bm IN NGC 6456 = PSN J17423216+6735418
     F. Ciabattari, E. Mazzoni, and S. Donati, Borgo a Mozzano, Italy, 
report
the discovery of an apparent supernova (mag 17.4) on unfiltered CCD images
(limiting mag 19.5) obtained on June 6.005 and 6.88 UT with a 0.5-m 
Newtonian
telescope (+ FLI4710 Proline camera).  The new object is located at R.A.
17h42m32s.16, Decl. = +67d35'41".8 (equinox 2000.0; astrometry with respect 
to
USNO-B1 stars), which is 2" east and 8" north of the center of the galaxy 
NGC
6456.  Nothing is visible at this position on the digitized plates of the
Palomar Sky Survey taken on 1987 June 1 (J plate; limiting magnitude 20.3) 
and
on 1993 Aug. 17 (F plate; limiting mag 20.3).  The variable was designated 
PSN
J17423216+6735418 when it was posted at the Central Bureau's TOCP webpage 
and
is here designated SN 2014bm based on the spectroscopic confirmation 
reported
below.  Additional CCD magnitudes for 2014bm:  2014 May 21, [19.5 
(Ciabattari
et al.); June 7.842, 17.8 (G. Masi; remotely using a 43-cm telescope at
Ceccano, Italy; position end figures 32s.09, 41".2); 9.943, 18.8 (F. Luppi 
and
L. Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end figures 
32s.08,
40".7; image posted at URL 
http://www.astrogeo.va.it/pub/TOCP/PSN_N6456.jpg).

     P. Ochner, N. Elias-Rosa, E. Cappellaro, A. Pastorello, S. Benetti, L.
Tomasella, and M. Turatto, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, report that an optical spectrogram (range 335-785
nm; resolution 0.9 nm), obtained on June 8.04 UT with the 1.82-m Copernico
Telescope in Asiago (+ AFOSC), shows that PSN J17423216+6735418 = SN 2014bm 
is
a type-Ia supernova.  Assuming a recessional velocity of 12371 km/s for the
host galaxy, NGC 6456 (Huchra et al. 2012, Ap.J. Suppl. 199, 26; via NED), a
good match is found with several normal type-Ia supernovae at about one week
after B-band maximum light.  An expansion velocity of 9350 km/s is derived
from the minimum of the Si II 635-nm line.  The Asiago classification 
spectra
are 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
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 June 14                     (CBET 3896)              Daniel W. E. Green