Most of the observing time on the VLA is allocated as ``fixed-time''
observing, with the observer being given a particular sidereal date
and time allocation on the VLA. However, the VLA gradually is moving
toward a system in which more observations are scheduled dynamically,
based on a combination of scientific priority and the expected
properties of the array and the weather. In particular, all time
during antenna moves and all ``filler'' time are scheduled
dynamically. The procedure for generating observing scripts is
similar to that described in Section 4.4, except
that the individual scans must be specified in time durations rather
than by the absolute stop time. After preparation, observe files for
dynamic scheduling are e-mailed to dynsoc@nrao.edu for queueing.
Since the details of dynamic scheduling are changing
on a more frequent basis than this document, we refer the reader
to the scheduling officers' home page for further information; this
page is located at http://www.aoc.nrao.edu/
schedsoc/ .