[IAUC] CBET 1705: 20090227 : SUPERNOVAE 2009ak AND 2009al

Vie Feb 27 13:59:33 ARST 2009

                                                  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 en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en 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      superseded by text appearing later in the printed IAU Circulars.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