Pulse arrival time measurements over fourteen years with the Nanshan 25-m and Parkes 64-m radio telescopes have been used to determine the average profile and timing properties for PSR J1757 - 2421 ( B1754 - 24 ) .
Analysis of the radio profile data shows a large variation of spectral index across the profile and an unusual increase in component separation with increasing frequency .
The timing observations show that PSR B1754 - 24 underwent a large glitch with a fractional increase in spin frequency of \Delta \nu _ { g } / \nu \sim 7.8 \times 10 ^ { -6 } in May 2011 .
At the time of the glitch there was a large permanent jump in the rotational frequency accompanied by two exponential recovery terms with timescales of 15 ( 6 ) and 97 ( 15 ) days , respectively .