Electronic Telegram No. 1320
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2008bm
     A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams,
California Institute of Technology; 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 detected in
multiple sequences of exposures of the Catalina Sky Survey (CSS) using the
0.7-m f/1.9 Catalina Schmidt telescope (+ 4000x4000 camera).

 SN       2008 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2008bm   Mar. 29.33   13 02 58.78  +10 30 27.0   17.4    6".8 E, 12".5 N

Nothing is visible at this position in past CSS images dating back to
Jan. 11.48 and 31.50 UT (no limiting magnitude provided) or in prior
Sloan Digital Sky Survey (SDSS) and Palomar-Quest co-added images
(limiting magnitude approximately 23).  Specific details and links to
discovery images can be found at the following website URL:
http://voeventnet.caltech.edu/feeds/ATEL/CSS/803291090704132795.atel.html.
The apparent host galaxy has a redshift of z = 0.032 (de Vaucouleurs et
al. 1991, via NED) and SDSS magnitudes g about 16.1, r about 15.7, and i
= 15.5.  J.-C. Pelle confirms the presence of a new object on an image
acquired by N. Teamo at Punaauia, Tahiti, with a 0.41-m f/8 Ritchey-
Chretien telescope on Mar. 29.48, providing mag V = 17.5 and position
end figures 58s.80, 27".2 for 2008bm; the new object is circled (with lines
of R.A. drawn in for every 15 sec, and Decl. lines for every 2') in Teamo's
image posted at the following website URL:
http://www.astrosurf.com/snweb2/images/13030p1030_20080328_F85.jpg.
Following posting on the Central Bureau's unconfirmed-objects webpage, D.
Balam, R. Robb, P. Wiegert, and A. Domokos confirm the presence of a new
unresolved source at magnitude g = 17.58 (with colors u-g = +0.76 and g-r =
+0.30, based on an SDSS-catalogued star of mag u = 18.93, g = 17.95, and r =
17.65 located at R.A. = 13h03m03s.43, Decl. = +10o30'16".7) on their CCD
images obtained with the 1.82-m Plaskett Telescope of the National Research
Council of Canada on Mar. 31.24; 2008bm was measured to be at R.A. =
13h02m58s.82, Decl. = +10o30'27".2, or 8".0 east and 12".8 north of the
galaxy center.  Nothing appears at this position on Palomar Sky Survey images.


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

                         (C) Copyright 2008 CBAT
2008 March 31                    (CBET 1320)              Daniel W. E. Green