Electronic Telegram No. 2660
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011ag IN PGC 11943 = PSN J03122655+1915064
     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
 2011ag   Feb. 25.15   3 12 26.55  +19 15 06.4   17.3    3".5 E, 20".0 N

This object was designated PSN J03122655+1915064 on the Central Bureau's
TOCP webpage, and is here designated SN 2011ag based on the spectroscopic
report below.  Further unfiltered CCD magnitudes for 2011ag:  Feb. 4.11 UT,
[20.4 (CSS); 27.089, 17.7 (R. A. Koff, Bennett, CO, U.S.A.; fourteen co-added
60-s images; position end figures 26s.55, 05".1).

     E. Y. Hsiao, N. Suzuki, and P. E. Nugent, Lawrence Berkeley National
Laboratory, report that inspection of a CCD spectrum (range 350-980 nm),
obtained on Feb. 27.25 UT with the 3-m Shane reflector (+ Kast) at Lick
Observatory, shows that 2011ag is a type-Ia supernova.  The "superfit"
software of Howell et al. (2005, Ap.J. 634, 1190) identified the spectrum as
that of a type-Ia supernova around a week past maximum.  The redshift matches
that of the reported host galaxy (PGC 11943):  z = 0.032.  The spectrum
closely resembles that of SN 1998bu at 10 days past maximum (Jha et al. 1999,
Ap.J. Suppl. 125, 73).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 February 28                 (CBET 2660)              Daniel W. E. Green