2011CBET.2652....1P

G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, and C. Hervias, Universidad de Chile; P. Gonzalez, Pontificia Universidad Catolica de Chile (for SN 2011X only); B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery of three supernovae on unfiltered CCD images obtained with the 0.41-m 'PROMPT' telescopes located at Cerro Tololo; SN 2011X was found with the 'PROMPT 5' telescope, and the other two supernovae were found with the 'PROMPT 3' telescope. The discovery observations are tabulated below (positional uncertainty in the range ± 0".2 to 0".3 in each coordinate):

---------------------------------------------------------------------------— SN 2011 UT R.A. (2000.0) Decl. Mag. Offset ---------------------------------------------------------------------------— 2011X Jan. 15.25 13 50 21.36 -52 39 58.5 17.3 63" W, 20" S 2011Y Jan. 27.07 8 12 58.25 -27 34 15.7 17.3 – 2011Z Jan. 29.25 13 30 43.04 -20 57 14.0 16.1 1".0 W, 8".3 S ---------------------------------------------------------------------------—

Additional approximate unfiltered CHASE magnitudes for 2011X (designated PSN J13502136-5239585 on the Central Bureau's TOCP webpage), which is thought to be connected with the galaxy ESO 221-7 = PGC 49121: 2009 June 4.06-2010 Aug. 14.07 UT, [21.0 (thirty 40-s archival images taken over this time span); 2011 Jan. 16.29, 17.2.

Additional approximate unfiltered CHASE magnitudes for 2011Y (designated PSN J08125825-2734157 on the Central Bureau's TOCP webpage), for which the faintness of the presumed host galaxy (PGC 23020) does not allow the measurement of reliable offsets between the supernova's position and the center of the galaxy: 2010 Dec. 31.23, [18.0; 2011 Jan. 8.18, [18.0; 28.05, 17.3.

Additional approximate unfiltered CHASE magnitudes for 2011Z (designated PSN J13304304-2057140 on the Central Bureau's TOCP webpage), which is thought to be connected with the galaxy ESO 576-77 = PGC 47494: 2010 Feb. 11.29, [18.5; June 27.02, [17.0; 2011 Feb. 2.28, (visible, but no mag provided).