Epoch of the glitch of the Vela pulsar (J0835-4510) to within 4 seconds

ATel #16615; Jim Palfreyman (University of Tasmania)
on 6 May 2024; 07:17 UT
Credential Certification: Jim Palfreyman (jim77742@gmail.com)

Tweet

We have been monitoring the Vela pulsar (J0835-4510) in recent months with high cadence using the 26 m radio telescope at Mt Pleasant run by the University of Tasmania. We have been using a centre frequency of 2250 MHz and a bandwidth of 64 MHz. We also confirm the recent glitch as reported in previous ATels, but potentially have more accurate information. The pulsar was unfortunately below the telescope's horizon when the glitch occurred, but we were observing 3.45 hours before the glitch and began again 2.45 hours afterwards. Using TEMPO2 and the before and after observations, we get: glitch epoch of MJD 60429.869615 +/- 3.84691e-05 dF0/F0 of 2.40976e-06 +/- 4.88083e-10 Thanks to Matthew Bailes, Ryan Shannon, and George Hobbs for confirming the fitting process used. Pre-fit TEMPO2 plot: https://www.dropbox.com/scl/fi/rwy3rwybcjpgwmpg7hdam/glitch_fit.png?rlkey=hpdybo5nkp5pstgtpuwkjyjcs&dl=0 Post-fit TEMPO2 plot: https://www.dropbox.com/scl/fi/e528eqr4efrnuvw6qqjcf/glitch_nofit.png?rlkey=dh6tztzdqan4u5kpazgf1e5ng&dl=0