[IAUC] CBET 2715: 20110508 : SUPERNOVA 2011ce IN NGC 6708 = PSN J18553580-5343290

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                                                  Electronic Telegram No. 2715
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 2011ce IN NGC 6708 = PSN J18553580-5343290
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S.
Silva, F. Carrasco, P. Sanchez, C. Hervias, and D. Iturra, Universidad de
Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello; C. Farias,
Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G.
Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip,
A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North
Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the
Millennium Center for Supernova Science collaboration), report the discovery
of an apparent supernova (mag approximately 15.8) on an unfiltered image taken
on Apr. 19.40 UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo.
The new object (which was designated PSN J18553580-5343290 when posted at the
Central Bureau's TOCP webpage and is here designated SN 2011ce based on the
spectroscopic report below) is located at R.A. = 18h55m35s.84 +/- 0".2, Decl.
= -53o43'29".1 +/- 0".2 (equinox 2000.0), which is about 2".2 east and 4".7
south of the center of the galaxy NGC 6708.  Additional CCD magnitudes for
2011ce:  2010 Sept. 11.01, [18.5 (PROMPT4 telescope); 2011 Mar. 4.36, [18.5
(PROMPT4 telescope); Mar. 26.35, 16.8 (PROMPT4 telescope); Apr. 20.32, 16.6
(0.5-m CHASE500 telescope); 22.675, 17.2 (Joseph Brimacombe, Coral Towers
Observatory, Cairns, Australia; red filter; position end figures 35s.84,
28".9).  Brimacombe has posted his image at the following website URL:
http://www.flickr.com/photos/43846774@N02/5644002805.  The type-Ia supernova
2004do also appeared in NGC 6708 (cf. IAUC 8382).

     J. Anderson, Universidad de Chile; N. Morrell, Las Campanas Observatory;
and G. Pignata, Universidad Andres Bello, on behalf of the Millennium Center
for Supernova Science, report optical spectroscopy (range 468-1005 nm) of
PSN J18553580-5343290 = SN 2011ce obtained on Apr. 23.2 UT with the Las
Campanas Baade telescope (+ IMACS).  Cross-correlation with a library of
supernova spectra using the "Supernova Identification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) gives best matches with the peculiar type-Ia
supernovae 2002cx and 2005hk at around 20 days 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 May 8                       (CBET 2715)              Daniel W. E. Green