Electronic Telegram No. 1705 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 SUPERNOVAE 2009ak AND 2009al A. J. Drake, S. G. Djorgovski, R. Williams, A. Mahabal, and M. J. Graham, California Institute of Technology; M. Catelan, Pontificia Universidad Catolica; E. C. Beshore, S. M. Larson, A. Boattini, and A. Gibbs, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the Catalina Real-time Transient Survey discovery of two apparent supernovae in unfiltered Catalina Sky Survey (CSS) images: SN 2009 UT R.A. (2000.0) Decl. Mag. Offset 2009ak Feb. 14.39 10 25 03.36 +17 58 21.3 19.4 26" E, 17" W 2009al Feb. 26.32 10 51 22.07 + 8 34 42.7 16.8 51" W, 41" N The discovery images of 2009ak were evidently taken by A. Boattini, while those for 2009al were evidently taken by A. Gibbs. Further magnitudes for 2009ak: 2008 Dec. 30.46 UT, [20.6 (CSS); 2009 Feb. 5.26, 19.6 (CSS); 19.54, 20.0 (Palomar 1.52-m reflector + Gunn g filter), 20.1 (Gunn i filter). The apparent host galaxy for 2009ak, SDSS J102501.54+175804.0, has Gunn magnitudes u = 18.9, g = 17.0, r = 15.9, i = 15.5, z = 15.1, and redshift z = 0.12. Further CSS magnitudes for 2009al: Feb. 5.31 UT, [20.3; 16.39, 18.9. Following posting on the Central Bureau's unconfirmed-objects webpage, M. Nissinen (Varkaus, Finland) writes that he and V.-P. Hentunen obtained R-band CCD images (limiting mag 16.9) on Feb. 27.28 remotely with a 30-cm reflector near Mayhill, NM, that show 2009al at mag 15.8 with position end figures 22s.13, 42".3 (which is 50" west and 39" north of the center of the galaxy NGC 3425); nothing is visible at this position on a Palomar Sky Survey F plate (no date or limiting magnitude provided). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 February 27 (CBET 1705) Daniel W. E. Green