[IAUC] CBET 2921: 20111128 : SUPERNOVA 2011ii IN PGC 20555 = PSN J07163408-3829038

Lun Nov 28 02:19:36 ART 2011

                                                  Electronic Telegram No. 2921
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 2011ii IN PGC 20555 = PSN J07163408-3829038
     G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F.
Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez,
Universidad de Chile; C. Farias and F. Aros, 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 17.6) on an unfiltered CCD image taken on Nov.
15.31 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo.  The
new object is located at R.A. = 7h16m34s.08 +/- 0".2, Decl. = -38o29'03".8 +/-
0".2 (equinox 2000.0), which is about 12".0 west and 11".2 north of the center
of the galaxy ESO 310-6 = PGC 20555.  The variable was designated PSN
J07163408-3829038 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2011ii.  Additional approximate CCD magnitudes for
2011ii:  Oct. 7.33, [18.5 (CHASE); Nov. 16.21, 17.0 (CHASE); 22.537, 16.8 (J.
Brimacombe, Cairns, Australia; infrared filter; bandpass > 700 nm; position
end figures 34s.03, 04".5).  Brimacombe's image is posted at the following
website URL:  http://www.flickr.com/photos/43846774@N02/6386159609/.

     F. Bufano, Istituto Nazionale di Astrofisica (INAF), Osservatorio
Astronomico di Catania; S. Benetti, A. Pastorello, and S. Valenti, INAF,
Osservatorio Astronomico di Padova; and G. Pignata, Universidad Andres Bello,
on behalf of a larger collaboration, report that a noisy spectrum of PSN
J07163408-3829038 = SN 2011ii, obtained on Nov. 17.27 UT with the New
Technology Telescope (+ EFOSC2; range 360-930 nm; resolution 1.7 nm), shows
it to be a type-Ib supernova.  A comparison of the observed spectrum with a
library of supernova spectra using the "GELATO" code (Harutyunyan et al. 2008,
A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi) suggests
that 2011ii is around maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 November 28                 (CBET 2921)              Daniel W. E. Green