[IAUC] CBET 2635: 20110114 : SUPERNOVAE 2011I AND 2011J

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                                                  Electronic Telegram No. 2635
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


SUPERNOVAE 2011I AND 2011J
     L. A. G. Monard, Calitzdorp, Western Cape, South Africa, reports his
discovery of an apparent supernova that appeared at mag 15.8 on unfiltered
CCD images taken both on Jan. 6.909 and 8.047 UT with a 0.35-m telescope:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011I    Jan. 6.909   9 50 24.99  -21 51 45.1   15.8    1" E, 1" N

The offset is given with respect to the core of a galaxy that lies about 3'
south of ESO 566-18; Monard notes that large uncertainties for the brightness
and the position are caused by the nearness of the variable to the galaxy
core.  Nothing is seen at this position on Digitized Sky Survey red images
down to mag 20.5 oron Monard's previous image of this galaxy taken on 2010
June 30.701 (limiting mag 18.0) and on earlier images by Monard with limiting
magnitudes exceeding 18.5.  This presumed supernova was designated PSN
J09502499-2151451 on the Central Bureau's "Transient Objects Confirmation
Page", and it is here given the final supernova designation SN 2011I.

     A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams,
California Institute of Technology; J. L. Prieto, Carnegie Observatories; 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 Catalina Real-time Transient
Survey's discovery of an apparent supernova in unfiltered Catalina Sky Survey
(CSS) images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.     Offset
 2011J    Jan. 8.46   10 50 44.20  +28 00 49.0   18.8     1" N

Nothing was visible at this position on a CSS image from 2010 Dec. 14.48 UT
(limiting mag 20.2).  This object was designated PSN J10504420+2800490 on
the TOCP, and is here designated SN 2011J.

     J. L. Prieto, Carnegie Observatories, reports that optical spectra (range
370-930 nm; resolution 0.7 nm) of 2011I and 2011J were obtained with the APO
3.5-m telescope (+ DIS) on Jan. 13.4 UT.  After cross-correlation with a
library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666,
1024), they obtain the following spectral classes:  2011I is a normal type-Ia
supernova at about 20 days after maximum light; 2011J is a type-Ia supernova
around maximum light, with redshift 0.030 +/- 0.006 obtained by SNID from the
supernova spectral features.


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

                         (C) Copyright 2011 CBAT
2011 January 14                  (CBET 2635)              Daniel W. E. Green