Electronic Telegram No. 1760
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)
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SUPERNOVA 2009db
     A. J. Drake, S. G. Djorgovski, A. Mahabal, R. Williams, and M. J. Graham,
California Institute of Technology; A. S. Moskvitin, T. A. Fatkhullin, V. V.
Sokolov, O. I. Spiridonova, and A. F. Valeev, Special Astrophysical
Observatory (SAO), Russian Academy of Sciences; E. Sonbas, Cukurova University;
S. B. Pandey, B. Kumar, and R. Roy, Aryabhatta Research Institute of
Observational Sciences, Nainital; D. Y. Tsvetkov, Sternberg Astronomical
Institute, Moscow State 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 a supernova in unfiltered Catalina Sky Survey (CSS)
images:

 SN       2009 UT        R.A. (2000.0) Decl.       Mag.     Offset
 2009db   Mar. 19.41   14 21 54.63  +26 01 02.0    18.4    0".9 W, 6".3 S

Follow-up images, including some taken with the Palomar 1.52-m reflector (+
Gunn g, r, and i filters) and the SAO Zeiss-1000 1.0-m telescope (+ R filter),
yield the following additional magnitudes for 2009db:  Feb. 26.45 UT, [21.0
(CSS); Mar. 21.22, g = 18.6, r = 18.7, i = 19.0; Mar. 25.41, 18.5 (CSS);
Mar. 28.07, R = 18.32; Mar. 29.98, R = 18.24; Apr. 1.93, R = 18.44; Apr. 2.28,
19.1 (CSS); Apr. 4.04, R = 18.55.  A confirming spectrogram (range 600-1000
nm) was taken with the BTA 6-m telescope on Apr. 4 UT; with the aid of the
Supernova Identification code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024),
2009db is found to be a type-Ia supernova, with a spectrum similar to that of
SN 1999ee.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 April 10                    (CBET 1760)              Daniel W. E. Green