Problem in the calculation of Tsys in GBTIDL

We have discovered an error in the calculation in Tsys for some GBTIDL calibration procedures in versions 1.2.0 and earlier. The result of the error is that the Tsys applied by these procedures was too small, by an offset of Tcal/2. The improper Tsys causes line strengths and noise levels to be too small by about Tcal/(2*Tsys).

For more details, read the full text of this note at: http://wiki.gb.nrao.edu/bin/view/Data/GbtidlCalibrationFix

This problem has been fixed in version 1.2.1, which is available for download.