2011CBET.2724....1D

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 Catalina Real-time Transient Survey's discovery of sixteen supernovae in unfiltered Catalina Sky Survey, Mount Lemmon Survey, and Siding Spring Survey images; S. Howerton (Arkansas City, KS, U.S.A.) was also involved in the discovery of 2011co and 2011cq as part of their bright-host-galaxy supernova search.

---------------------------------------------------------------------------— SN 2011 UT R.A. (2000.0) Decl. Mag. Offset ---------------------------------------------------------------------------— 2011cl Feb. 4.21 8 26 49.16 +20 22 31.8 17.2 3" E, 37" N 2011cm Apr. 14.47 17 14 19.18 +43 59 55.2 18.1 1" E, 1" N 2011cn Apr. 24.30 13 55 31.54 - 2 30 00.5 19.0 1" E, 1" N 2011co Apr. 25.42 9 16 21.65 -23 37 17.4 18.5 26" E, 41" N 2011cp Apr. 26.17 7 52 32.61 +21 53 29.7 19.5 – 2011cq Apr. 26.18 12 16 07.15 - 3 34 30.7 18.9 21" W, 18" S 2011cr Apr. 26.47 22 04 51.77 +12 46 13.0 17.9 16" E, 16" S 2011cs Apr. 27.18 12 08 01.08 +49 13 33.0 18.6 – 2011ct Apr. 27.33 15 06 34.40 -10 19 36.5 19.1 2" E 2011cu Apr. 30.20 11 35 10.63 + 1 00 20.9 21.0 – 2011cv Apr. 30.30 14 33 37.37 -12 02 20.9 19.2 4" E, 14" S 2011cw May 1.38 14 47 39.55 +51 41 04.7 18.3 1" S 2011cx May 2.28 12 14 22.16 +33 55 09.5 18.6 1" W 2011cy May 7.35 14 58 37.10 + 2 20 59.1 20.0 – 2011cz May 4.23 12 11 24.09 +37 25 52.5 19.2 2" E, 2" S 2011da May 4.24 12 22 27.91 +37 49 39.5 19.2 2" E, 1" S ---------------------------------------------------------------------------—

Spectroscopic follow-up data were taken with the Palomar 5-m reflector (+ DBSP) on May 7 and 8 UT. Spectrograms (range 380-920 nm) were cross-correlated with a library of spectra using the SNIDs program (Blondin and Tonry 2007, Ap.J. 666, 1024). Tabulated below are the best matches found to spectra of earlier supernovae and the measured redshifts of the new objects.

---------------------------------------------------------------------------— SN Type SN Match z ---------------------------------------------------------------------------— 2011cl IIP 1992H 0.03 2011cm Ia 2002bo 0.03 2011cn Ia 1998bu 0.09 2011co IIP 2006bp 0.01 2011cp IIn – 0.38 2011cq II-pec 1987A 0.02 2011cr Ia 2002bo 0.05 2011cs Ia 1994ae 0.11 2011ct Ic 1995F 0.10 2011cu Ia 1994ae 0.11 2011cv Ia-pec 2000cx 0.08 2011cw IIn 1996L 0.04 2011cx Ia 1989B 0.11 2011cy Ia 1999aa 0.16 2011cz IIP 2004et 0.06 2011da IIP 2004et 0.06 ---------------------------------------------------------------------------—

Several of these objects were posted on the Central Bureau's TOCP webpage, yielding the following respective preliminary designations: 2011cl, PSN J08264916+2022318; 2011co, TCP J09162165-2337174; 2011cp, PSN J07523261+2153297; 2011cq, PSN J12160715-0334307; 2011cr, PSN J22045177+1246130; 2011cu, PSN J11351063+0100209; 2011cv, PSN J14333737-1202209; 2011cz, PSN J12112409+3725525; 2011da, PSN J12222791+3749395. Additional CSS magnitudes for 2011cq: Apr. 11.24 UT, [20.1; 23.19, 19.0.