[IAUC] CBET 3210: 20120827 : SUPERNOVA 2012ej IN IC 2166 = PSN J06265101+5905026

Lun Ago 27 07:24:14 ART 2012

                                                  Electronic Telegram No. 3210
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)
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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012ej IN IC 2166 = PSN J06265101+5905026
     D. Grennan, Raheny Observatory, Dublin, Ireland reports his discovery
of an apparent supernova (mag 16.2) on unfiltered CCD images (limiting mag
19.8) taken on Aug. 22.009 UT using a 0.35-m f/4.9 Schmidt-Cassegrain
telescope (+ SBIG ST8-XME CCD camera) in the course of his supernova patrol.
The new object appears at  R.A. = 6h26m51s.01, Decl. = +59d05'02".6 (equinox
2000.0), which is 32".3 west and 21".6 north of the core of the galaxy
IC 2166.  The variable was designated PSN J06265101+5905026 when it was
posted at the Central Bureau's TOCP webpage and is designated SN 2012ej
here based on the spectroscopic report published below.  Additional CCD
magnitudes (unfiltered unless noted otherwise) for 2012ej: Mar. 30, [17.9
(D. Denisenko and V. Lipunov, Sternberg Astronomical Institute; and V.
Yurkov and E. Sinyakov, Blagoveschensk Educational State University;
0.40-m f/2.5 MASTER-Amur robotic reflector + 16-megapixel camera);
Aug. 19.775, 15.8 (Denisenko et al.; pre-discovery image; position end
figures 51s.06, 02".6; comparison of the Mar. 30 and Aug. 19 images is
posted at the following
website URL
http://master.sai.msu.ru/static/OT/PSNJ06265101+5905026-MASTER.jpg);
Aug. 22.120, 16.4 (T. Boles, Coddenham, England; position end figures 50s.99,
02".1); Aug. 24.448, 15.3 (L. Elenin, Lyubertsy, Russia; and I. Molotov,
Moscow, Russia; remotely taken at the ISON-NM Observatory near Mayhill, NM,
USA, with a 0.45-m f/2.8 telescope; position end figures 50s.98 +/- 0".1,
02".6 +/- 0".1;  NOMAD reference stars; limiting mag about 20.3; image posted
at URL http://spaceobs.org/images/TOCP/PSNJ06265101+5905026-20120824.png);
Aug. 24.457, 15.6 (Joseph Brimacombe, Cairns, Australia; remotely using a
51-cm RCOS telescope + STL11K camera + luminance filter at the New Mexico
Skies Observatory near Mayhill; position end figures 51s.01, 02".7; image
posted at  the following website URL:
http://www.flickr.com/photos/43846774@N02/7852074882/); Aug. 26.030, 15.9
(Grennan; position end figures 50s.97, 02".7).

      J. Fynbo, Copenhagen University, and his students A. Bo Nielsen, M.
Theiss Kristensen, T. Ehlert Brinckmann, M. Ortving Lindholmer, and J.-K.
Krogager; J. Sollerman, Stockholm University; and M. Stritzinger, Aarhus
University; report that they obtained a visual-wavelength spectrogram of PSN
J06265101+5905026  = SN 2012ej with the Nordic Optical Telescope (+ ALFOSC;
range 350-900 nm, resolution 0.8 nm) on Aug. 23.15 UT.  The fully reduced
spectrum indicates that 2012ej is a type-Ic supernova.  Adopting a redshift
of z = 0.089 (Springob et al. 2005, Ap.J. Suppl. 160, 149; via NED), the best
match from cross-correlation of the spectrum with a library of supernova
spectra using the "Supernova Identification" code (Blondin and Tonry 2007,
Ap.J. 666, 1024) is with the type-Ic supernova 2004aw (Taubenberger et al.
2006, MNRAS 371, 1459) somewhat past maximum light.


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

                         (C) Copyright 2012 CBAT
2012 August 27                   (CBET 3210)              Michael Rudenko