[IAUC] CBET 2842: 20110929 : SUPERNOVA 2011gi IN PGC 1981 = PSN J00324300+2606516

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                                                  Electronic Telegram No. 2842
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 2011gi IN PGC 1981 = PSN J00324300+2606516
     S. Howerton, Arkansas City, KS, U.S.A.; 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; R. H. McNaught and G. Garradd, Australian National University; 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 public images from the Catalina Sky Survey (CSS).

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011gi   Sep. 21.27   0 32 43.00  +26 06 51.6   18.2    13".8 W, 13".6 S

This variable was designated PSN J00324300+2606516 when it was posted on the
Central Bureau's TOCP webpage and is here designated 2011gi based on the
spectroscopic confirmation reported below.  Additional unfiltered CCD
magnitudes for 2011gi:  June 10.44 UT, [19.5 (CSS); Sept. 23.151, 18.5 (Joseph
Brimacombe, Cairns, Australia; position end figures 43s.00, 51".2; image
posted at URL http://www.flickr.com/photos/43846774@N02/6177438626/); 23.246,
17.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain
reflector + Apogee AP-47p CCD camera; thirty stacked 60-s images; limiting mag
20.5; image scale 2"/pixel; position end figures 42s.97, 51".2, UCAC3
reference stars).

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on
behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm)
of PSN J00324300+2606516 = 2011gi was obtained on Sept. 27 UT by Marion with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-correlation
with a library of supernova spectra using the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011gi is a type-Ia
supernova about 40 days after maximum light.  The best-fit SNID templates are
for 1991T-like type-Ia supernovae between 37 and 45 days post-maximum at z =
0.034.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 September 29                (CBET 2842)              Daniel W. E. Green