Yahoo says it was today...this is an error.
March 15 2013, after close. Money managers are expecting poor forward guidance. Earnings marginal at best. Its selling off in anticipation of this internal information. This could easily sell-off to 34s by Thursday, then another 5 %.
March 15 is a Friday so it will have to be before market open, not after the close. Are you sure it's on the 15th?