[IAUC] CBET 3243: 20121001 : SUPERNOVA 2012ff = PSN J23054871+1419564

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                                                  Electronic Telegram No. 3243
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 2012ff = PSN J23054871+1419564
     Further to CBET 3199, S. B. Cenko, W. Li, and A. V. Filippenko report the
LOSS discovery of an apparent supernova on unfiltered KAIT images:

 SN       2012 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2012ff   Aug. 21.38   23 05 48.71  +14 19 56.4   19.2     1".5 W, 3".3 N

The variable was designated PSN J23054871+1419564 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012ff based on the
spectroscopic confirmation reported below.  Additional unfiltered CCD
magnitudes for 2012ff:  Aug. 15.41 UT, [19.5 (KAIT); Sept. 15.950, 18.1
(Xavier Bros, Ager, Spain; 35-cm f/6 reflector; position end figures 48s.88,
56".2; UCAC2 reference stars; image posted at the following website URL:
http://anysllum.com/PSN_ANON_PEG_15092012.jpg).

     J. M. Silverman, K. I. Clubb, P. Kelly, and A. V. Filippenko, University
of California, Berkeley, report that inspection of a low-signal-to-noise-ratio
CCD spectrogram (range 340-1000 nm), obtained on Sept. 7 UT with the Shane 3-m
reflector (+ Kast spectrograph) at Lick Observatory, shows that PSN
J23054871+1419564 = SN 2012ff is a 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) indicates that 2012ff is a
normal type-Ia supernova approximately 11 days past maximum brightness.  After
removal of the host-galaxy recession velocity of 32400 km/s, determined from
narrow emission lines, the absorption minimum of the Si II 635.5-nm line is
found to be blueshifted by 11400 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2012 CBAT
2012 October 1                   (CBET 3243)              Daniel W. E. Green