  Two-particle correlations between pions in Au+Au collisions have been
measured at beam kinetic energies of 6, 8, and 10.8 GeV/u at the Alternating
Gradient Synchrotron (AGS) over a wide range of rapidities using a magnetic
spectrometer. The data have been analyzed in the Hanbury-Brown and Twiss (HBT)
framework to extract source parameters. The event-by-event orientation of the
reaction plane has also been measured using a scintillator hodoscope at far
forward rapidities, and beam vertexing detectors upstream of the target. A
preliminary analysis of the dependence of the source parameters on the reaction
plane is presented.

Nuclear Experiment