Time-Resolved Spectroscopy with SDSS
  We present a brief technical outline of the newly-formed 'Detection of Spectroscopic Differences over Time' (DS/DT) project. Our collaboration is using the individual exposures from the SDSS spectroscopic archive to produce a uniformly-processed set of time-resolved spectra. Here we provide an overview of the properties and processing of the available data, and highlight the wide range of time baselines present in the archive. 
Steven Bickerton, Carles Badenes, Thomas Hettinger, Timothy Beers, and   Sonya Huang
astro-ph.IM