[IAUC] CBET 2949: 20111224 : SUPERNOVA 2011jd

Vie Dic 23 22:44:40 ART 2011

                                                  Electronic Telegram No. 2949
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 2011jd
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
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 Catalina Sky Survey (CSS) images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011jd   Nov. 19.17   0 22 54.27  +13 52 22.4   18.3    0".2 W, 2".2 N

Further CSS magnitudes for 2011jd:  Oct. 15.36 UT, [19.5; Nov. 27.20, 18.1.

     L. Tomasella, S. Benetti, A. Pastorello, S. Valenti, and F. Bufano,
Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on
behalf of a larger collaboration, report that a spectrogram of 2011jd,
obtained on Dec. 18.87 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC;
range 350-820 nm; resolution 2.4 nm), shows it to be a type-Ia supernova.  The
best fit to this spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488,
383; available at website URL https://gelato.tng.iac.es/login.cgi) suggests
that 2011jd is similar to type-Ia supernovae between three and four weeks
after maximum light, if a redshift of 0.079 is assumed for the host galaxy.


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                         (C) Copyright 2011 CBAT
2011 December 24                 (CBET 2949)              Daniel W. E. Green