[IAUC] CBET 2841: 20110929 : SUPERNOVA 2011gh IN NGC 2405 = PSN J07321603+2554300

Jue Sep 29 14:59:19 ART 2011

                                                  Electronic Telegram No. 2841
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 2011gh IN NGC 2405 = PSN J07321603+2554300
     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.

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011gh   Sep. 19.48   7 32 14.94  +25 54 14.6   18.3    12".5 E, 8".7 S

Drake originally posted position end figures 16s.03, 30".0 on the Central
Bureau's TOCP webpage, and the provisional designation PSN J07321603+2554300
was assigned to this varible; the designation SN 2011gh is assigned here,
based on the spectroscopic confirmation reported below.  Additional CCD
magnitudes for 2011gh (unfiltered unless noted otherwise):  Apr. 29.17 UT,
[19.5 (Mount Lemmon Survey; via Drake); Sept. 20.476, 19.1 (Joseph Brimacombe,
Cairns, Australia); 21.475, R = 19.0 (Brimacombe).  Brimacombe's Sept. 20 image
is posted at URL http://www.flickr.com/photos/43846774@N02/6167919130/; his
Sept. 21 image is at http://www.flickr.com/photos/43846774@N02/6174516626/.

     S. Valenti, S. Benetti, L. Tomasella, and P. Ochner, Osservatorio
Astronomico di Padova, Istituto Nazionale di Astrofisica; and A. Pastorello,
Dipartimento di Astronomia, Universita di Padova, on behalf of a larger
collaboration, report that a spectrogram (range 360-810 nm; resolution 2.2 nm)
of PSN J07321603+2554300 = SN 2011gh, obtained on Sept. 26.10 UT, suggests
that it is a type-Ib/c supernova.  Cross-correlation with a library of
supernova spectra via the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488,
383; available at URL https://gelato.tng.iac.es/login.cgi), suggests a
type-Ib/c supernova a few weeks after B-band maximum.

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 2841)              Daniel W. E. Green