Typically guided bombs are from 1000 lbs to 2000 lbs. As far as I'm aware, but then, I'm not an Air Force guy.
It could have been a lot of smaller ones, or several medium sized ones.
Smart weapons: he JDAM will upgrade the existing inventory of Mk-83 1,000- and Mk-84 2,000-pound general purpose unitary bombs and the 2,000-pound hard target penetrator bomb by integrating a guidance kit consisting of an inertial navigation system/global positioning system guidance kit. The 1,000-pound variant of JDAM is designated the GBU-31, and the 2,000-pound version of the JDAM is designated the GBU-32. JDAM variants for the Mk-80 250-pound and Mk-81 500-pound bombs are designated GBU-29 and GBU-30, respectively. Hard Target penetrators being changed into low-cost JDAMs included the 2,000 pound BLU-109 and 1,000 pound BLU-110.
http://www.fas.org/man/dod-101/sys/smart/jdam.htm