[IAUC] CBET 2954: 20111225 : SUPERNOVA 2011ji

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2954
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 2011ji
     A. J. Drake, M. J. Graham, A. Mahabal, R. Williams, and S. G. Djorgovski,
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 Mount Lemmon Survey (MLS) images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.
 2011ji   Nov. 28.41   9 08 21.16  +16 33 37.1   18.5

Further MLS magnitudes for 2011ji:  May 13.21 UT, [19.2; Dec. 24.47, 18.9.

     L. Tomasella, S. Valenti, S. Benetti, F. Bufano, M. Fiaschi, A.
Pastorello, and P. Ochner, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, on behalf of a larger collaboration, report that a
spectrogram of 2011ji, obtained on Dec. 24.02 UT with the Asiago 1.82-m
Copernico Telescope (+ AFOSC; range 350-820 nm; resolution 2.4 nm), suggests
that 2011ji is a type-Ia supernova around one month after maximum.  Using
GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available at website URL
https://gelato.tng.iac.es/login.cgi), the spectrum is found to be similar
to that of SN 1999gp at 34 days past maximum.  A narrow H_alpha feature is
visible in the spectrum, fixing the redshift at z = 0.089.  However, because
of the poor resolution of the spectrum, it cannot be verified if H_alpha is
circumstellar or due to a contaminating H II region.


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                         (C) Copyright 2011 CBAT
2011 December 25                 (CBET 2954)              Daniel W. E. Green