2006CBET..772....1L

B. Leibundgut, European Southern Observatory (ESO); J. Sollerman, DARK Cosmology Center; R. Foley, University of California, Berkeley; S. Rodney, University of Hawaii; P. Challis, Harvard-Smithsonian Center for Astrophysics; and K. Boutsia, ESO, on behalf of the ESSENCE project (cf. CBET 717; IAUC 8427, 8464), report the discovery of 17 supernovae on multiple R- and I-band images taken at the Blanco 4-m telescope (equipped with the MOSAIC II camera) during Nov. 10-29 by project members. Spectroscopic observations (range 380-890 nm) were obtained with Keck I (+ LRIS), Keck II (+ DEIMOS), the Very Large Telescope (+ FORS1), and the Magellan Baade Telescope (+ IMACS). The table includes the R-band discovery magnitude, the redshift (z), the spectroscopic type, and an estimate of the phase (age, in days from maximum brightness; general uncertainty ± 2 days) for each object.