I called the number back when I got home. They called me just before 6pm, and I called them back at 6:20 However I got a voice message that they were "The Fundraising Center" and they were unable to take my call at this time.
Don't know if it's legit or not. The web says it's part of MGC, "the US Branch of MGC, one of Israel's leading grant writing companies"
On the first anniversary of the Boston Marathon bombings, this fraudulent group is trying to extract money from gullible people "for the benefit of first responders and their families". Don't fall for it; it's not legit.