[IAUC] CBET 2859: 20111004 : SUPERNOVA 2011gs = PSN J04210999+1328044

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                                                  Electronic Telegram No. 2859
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 2011gs = PSN J04210999+1328044
     A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams,
California Institute of Technology; J. L. Prieto, Princeton University; M.
Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M.
Larson, Lunar and Planetary Laboratory, University of Arizona; and E.
Christensen, Gemini Observatory, report the discovery of an apparent supernova
in unfiltered Catalina Sky Survey (CSS) images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011gs   Sep. 23.46   4 21 09.99  +13 28 04.4   17.4    10".1 E, 3".7 S

This variable was designated PSN J04210999+1328044 when it was posted on the
Central Bureau's TOCP webpage and is here designated SN 2011gs based on the
spectroscopic report below.  Further CCD magnitudes for 2011gs:  Mar. 29.15
UT, [19.4 (CSS); Sept. 29.39, 17.6 (CSS); Oct. 2.131, R = 18.9 (Federica Luppi,
Varese, Italy; 0.36-m f/7.9 reflector + Bessell R filter; position end figures
10s.03, 04".5; CMC-14 catalogue reference stars; image posted at website URL
http://www.astrogeo.va.it/pub/TOCP/PSN_J04210999+1328044.jpg).

     F. Bufano, Istituto Nazionale di Astrofisica (INAF), Osservatorio
Astronomico di Catania; and S. Valenti and A. Pastorello, INAF, Osservatorio
Astronomico di Padova, on behalf of a larger collaboration, report that a
spectrum of PSN J04210999+1328044 = SN 2011gs, obtained on Oct. 1.95 UT with
the Ekar-Copernico 1.82-m telescope (+ AFOSC), shows it to be 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) suggests a normal type-Ia supernova about 30 after its B-band maximum
(the deduced redshift is 0.027).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 October 4                   (CBET 2859)              Daniel W. E. Green