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Basic Information on gpboot
Task: gpboot
Purpose: Correct the gains table of a visibility data-set.
Categories: calibration
GpBoot is a MIRIAD program which corrects a visibility data-set's
gain table.
GpBoot works by comparing the amplitudes in the gain table of one
data-set with those of another. The gains are assumed to differ
by a constant factor. It is assumed that the
instrumental gain and atmospheric attenuation of the two data-sets
were the same, and so the difference in gain is due to an
arbitrary or incorrect flux being specified when initially
determining the gains.
Key: vis
The input visibility file, containing the gain file to correct.
The gains are assumed to be out by a constant factor.
Key: cal
This is a visibility data-set, which is assumed to contain a
gain table which scales the data to absolute flux units.
Key: select
Normal uv-selection parameter. This selects the gains in the
``vis'' that are compared against the ``cal'' gains (note that
all the ``cal'' gains are involved in the comparison). Currently
ONLY time and antenna selection are permitted. You will use
this parameter to select which data the instrumental/atmospheric
amplitude gains for ``vis'' are comparable to the observation in
``cal''.