[IAUC] CBET 2666: 20110304 : SUPERNOVA 2011al

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2666
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 2011al
     A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams,
California Institute of Technology; Vijay Mohan, Inter-University Center for
Astronomy and Astrophysics; 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 a supernova in unfiltered Catalina Sky Survey (CSS) images:

    SN       2011 UT       R.A. (2000.0) Decl.      Mag.
    2011al   Feb. 5.41   10 26 56.21  +18 29 07.4   18.7

Follow-up observations were performed with the Palomar 1.5-m with Gunn filters.
Further magnitudes for 2011al:  Jan. 26.45 UT, [19.7 (CSS); Feb. 14.16, g =
17.1, r = 17.3, i = 17.7, z = 17.8; Feb. 22.3, g = 17.0, r = 17.1, i = 17.8,
z = 17.3; Feb. 23.28, 17.2 (CSS).  Spectroscopic confirmation was obtained on
Feb. 13.96 with the IGO 2-m telescope (+ IFOSC; range 350-850 nm).  Cross-
correlation with a library of spectra using the "Supernova Identification" code
of Blondin and Tonry (2007, Ap.J. 666, 1024) reveals that 2011al is a type-Ia
supernova near z = 0.06 and was most like SN 1999aa slightly after maximum.
No host galaxy is seen in Sloan Digital Sky Survey images reaching Gunn r
magnitude 22.


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                         (C) Copyright 2011 CBAT
2011 March 4                     (CBET 2666)              Daniel W. E. Green