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The First Confirmed La Silla-QUEST Type Ia SN (LSQ11bk)

ATel #3812; E. Hadjiyska (Yale), D. Rabinowitz (Yale), C. Baltay (Yale), N. Ellman (Yale), R. McKinnon (Yale), P. Nugent (LBNL), M. Phillips (LCO), N. Morrell (LCO), E. Hsiao (LCO)
on 17 Dec 2011; 22:12 UT
Credential Certification: Ellie Hadjiyska (ellie.hadjiyska@yale.edu)

Subjects: Optical, Supernovae

We report the discovery of a Type Ia SN at z=0.04 on December 6.058 (when the variable was at magnitude R = 17.2), as part of the La Silla-QUEST (LSQ) transient survey conducted with Yale University's 160-megapixel QUEST camera on the 1.0-m Schmidt Telescope of the European Southern Observatory at La Silla, Chile (Rabinowitz et al. 2011, Ap.J. 732, 512). The source's position is RA = 4h20m44s.27, Dec = -8o35'55".46 (equinox 2000.0). A faint source is reported at this position in the Guide Star Catalog V2.3.2 (with F = 20.96). Followup LSQ observations taken during December 7-17 reveal a gradual brightness increase by > 0.7 mag. A spectrum (range 0.4-1.0 um) taken on December 16 with IMACS on the Magellan-Baade 6.5-m telescope at the Carnegie Institution's Las Campanas Observatory identified the source as a Type Ia SN near peak. Additional follow up observations have been initiated with the Swope Telescope and RetroCam since December 15.