Point Source C-band Mueller Matrices for the Green Bank Telescope

Abstract C -band Mueller matrices for the Green Bank Telescope are presented here which enable on-sky Stokes parameters point sources at beam center to be determined. Standard calibrators, 3C 138 and 286, were observed using Spider program steer telescope across a broad range of R.A. on both sides zenith transit. For this analysis, only observations peak pattern used rather than full sweep runs. Therefore, results apply center. The shown vary with frequency use Hi-Cal or Lo-Cal noise diodes, due relative calibration gain between X Y components feed. However, can determined from source known polarization. Correcting data prior analysis allows frequency-independent matrix. This generic matrix is provide reliable polarization measurements.