2010CBET.2208....1D

Further to CBET 2156, 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 CRTS discovery of an apparent supernova in unfiltered Catalina Sky Survey images:

---------------------------------------------------------------------------— SN 2010 UT R.A. (2000.0) Decl. Mag. Offset ---------------------------------------------------------------------------— 2010am Mar. 12.19 9 33 01.75 +15 49 08.8 17.8 5".2 W, 7".3 S ---------------------------------------------------------------------------—

Further magnitude estimates for 2010am: 2009 Nov. 26, [19.5; 2010 Feb. 14.31 UT, 17.7; Mar. 4.26, 17.3. Drake et al. add that, further to CBET 2131, spectroscopic observations of 2009nt were taken with the Keck-I telescope (+ LRIS) on Jan. 7.33 UT. Cross-correlation with a library of supernova spectra using the SNID code indicates 2009nt to be a type-Ia supernova, most similar to SN 2003du at 52 days past maximum light. Narrow Balmer, O II, and O III lines from the host galaxy show the supernova to be at redshift z = 0.10.