TIMING BEHAVIOR OF 96 RADIO PULSARS

We present results from observations of 104 pulsars made between 1989 August and 1993 April, including timing solutions for 96 of them. Puls e profiles were recorded at four frequencies in the range 0.4-1.64 GHz , yielding topocentric pulse arrival times with uncertainties of order 10(-3) periods. Models fitted to the timing data yield accurate posit ions, periods, period derivatives, and dispersion measures for each pu lsar. Nine of the measured period derivatives are new, and most of the parameters represent improvements upon previous measurements. In a fe w cases we correct some erroneous parameter values from the published literature. A glitch was observed in the PSR B1800-21 pulse arrival ti mes, and we fit a simple exponential model to the post-glitch recovery . We present graphs of the observed pulse shapes and their evolution w ith frequency, a table of measured pulse widths, and quantitative esti mates of the long-term timing stability of each pulsar.