[IAUC] CBET 1783: 20090429 : SUPERNOVA 2009dr

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                                                  Electronic Telegram No. 1783
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2009dr
     Further to CBET 1754, R. Quimby, California Institute of Technology --
together with M. M. Kasliwal, P. Nugent, D. A. Howell, A. Rau, and V.
Bhalerao -- on behalf of the larger "Palomar Transient Factory" collaboration,
report the discovery of a supernova (R magnitude about 20.3) in multiple
images obtained with the Palomar Observatory 1.2-m Oschin Schmidt telescope
(+ CFH12K camera) during Apr. 17.25-17.50 UT.  Follow-up imaging obtained
with the Palomar Observatory 1.5-m telescope shows that the new object,
designated 2009dr, brightened to magnitude r = 18.5 on Apr. 28.77.  SN 2009dr
is located at R.A. = 14h44m42s.08, Decl. = +49o43'44".9 (equinox 2000.0;
uncertainty < 1").  No host galaxy is detected in reference data (limiting
R mag about 22.7), nor is a source present in the Sloan Digital Sky Survey
at this location.  Spectra (range 325-1000 nm) of 2009dr, obtained on Apr.
27.37 with the 5.1-m Palomar Hale telescope (+ DBSP), show some similarities
to early spectra of SN 2007if (cf. CBET 1059), which later resembled spectra
of SN 2003fg.  SN 2003fg has been proposed to be a super-Chandrasekhar-mass
explosion (Howell et al. 2006, Nature 443, 308).  Template matching
indicates an approximate redshift of z = 0.1.  Additional information was
posted at http://www.astronomerstelegram.org/?read=2037.


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                         (C) Copyright 2009 CBAT
2009 April 29                    (CBET 1783)              Daniel W. E. Green