[IAUC] CBET 2788: 20110814 : SUPERNOVA 2011fc = PSN J23013638+3220069

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2788
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 2011fc = PSN J23013638+3220069
     J. Skvarc, Crni Vrh Observatory, reports the discovery of an apparent
supernova (red magnitude 17.9) by Blaz Mikuz on four unfiltered CCD images
taken taken around July 11.0 UT with a 60-cm telescope at the Crni Vrh
Observatory.  The new object is located at R.A. = 23h01m36s.38, Decl. =
+32o20'06".9 (equinox 2000.0), which is 6" west and 8" north of the presumed
host galaxy; the discovery image is posted at the following website URL:
http://www.observatorij.org/vstars/PSNJ23013638+3220069.jpg.  Nothing is
visible at this position on the Digitized Sky Survey and Palomar Sky Survey
(limiting magnitudes down to 20, but no bandpasses or dates provided).  The
variable was designated PSN J23013638+3220069 when posted at the Central
Bureau's TOCP webpage and is here designated SN 2011fc based on the
spectroscopic report below.
     Additional magnitudes for 2011fc (unfiltered unless otherwise noted):
2008 Oct. 19, [19.2 (Crni Vrh archived images); 2009 July 23, [19.0 (Crni Vrh
archived images); Sept. 24, [19.0 (Crni Vrh archived images); 2010 Aug. 10,
[19.0 (Crni Vrh archived images); 2011 July 12.034, R = 17.8 +/- 0.2 (Skvarc);
12.036, B = 17.9 +/- 0.2 (Skvarc); 12.977, R = 18.0 +/- 0.2 (Skvarc; bad
conditions); 12.981, B = 18.0 +/- 0.2 (Skvarc; bad conditions); 15.413, 17.6
(J. Brimacombe, Cairns, Australia; red filter; position end figures 36s.34,
07".3; image posted at http://www.flickr.com/photos/43846774@N02/5941183646/);
20.349, 17.8 (Brimacombe); 29.984, 18.9 (Federica Luppi Varese, Italy; 0.36-m
f/7.9 reflector + Bessell R filter; position end figures 36s.40, 07".4; image
posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_230136+322007.jpg);
30.965, 18.2 (X. Bros, Ager, Catalonia, Spain; 35-cm f/4.6 telescope +
ST8-XME camera; position end figures 23s.38, 06".8; image posted at website
URL http://anysllum.com/SNANONIMA2011A.jpg); Aug. 2.065, R = 18.6 +/- 0.2 (B.
Mikuz, 60-cm f/3.3 Cichocki telescope; using R2 magnitudes from USNO-B1
catalogue).

     A. Skielboe, T. Paarup, S. Knudsen, M. Stockman, S. Geier, and J. Fynbo,
Niels Bohr Institute, Copenhagen University; together with J. Sollerman and M.
Stritzinger, Stockholm University, report that they obtained an optical
spectrum of PSN J23013638+3220069 = SN 2011fc with the Nordic Optical Telescope
(+ ALFOSC; range 350-900 nm, resolution 0.8 nm) on Aug. 11.13 UT.  The spectrum
indicates that 2011fc is a type-Ia supernova at a redshift of 0.05.  Cross-
correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) gives
reasonable matches to both normal and subluminous 1991bg-like type-Ia
supernovae at roughly a month past maximum.


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

                         (C) Copyright 2011 CBAT
2011 August 14                   (CBET 2788)              Daniel W. E. Green