Electronic Telegram No. 3302
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 2012gl IN NGC 3153 = PSN J10125032+1240567
     Further to CBET 3199, J. Gross, 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
 2012gl   Oct. 29.53   10 12 50.32  +12 40 56.7   16.1      4".4 W, 57".7 N

The variable was designated PSN J10125032+1240567 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012gl based on the
spectroscopic confirmation reported below.  Additional magnitudes for 2012gl:
May 20.21 UT, [18.0 (KAIT); Oct. 30.483, 17.0 (L. Elenin, Lyubertsy, Russia;
and I. Molotov, Moscow, Russia; three images taken remotely at the ISON-NM
Observatory near Mayhill, NM, USA, with a 0.45-m f/2.8 telescope; position
end figures 50s.32 +/- 0".14, 56".5 +/- 0".11; UCAC-4 reference stars;
limiting mag about 18.9; image posted at the following website URL:
http://spaceobs.org/images/TOCP/PSNJ10125032+1240567-20121030.png); Nov.
8.122, 17.3 (Federica Luppi and Luca Buzzi, Varese, Italy; position end
figures 50s.30, 56".7; image posted at the following website URL:
http://www.astrogeo.va.it/pub/TOCP/PSN_N3153.jpg).

     J. M. Silverman, S. B. Cenko, P. Kelly, and A. V. Filippenko, University
of California, Berkeley, report that inspection of a CCD spectrum (range
340-1000 nm), obtained on Nov. 6.5 UT with the Shane 3-m reflector (+ Kast
spectrograph) at Lick Observatory, shows that PSN J10125032+1240567 = SN
2012gl 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 2012gl is 1-2 months after maximum
brightness.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 November 19                 (CBET 3302)              Daniel W. E. Green