Glitch event observed in the pulsar PSR J1740-3015

ATel #9054; Fabian Jankowski (Swinburne University of Technology), Matthew Bailes (Swinburne University of Technology), Ewan Barr (Swinburne University of Technology), Timothy Bateman (University of Sydney), Shivani Bhandari (Swinburne University of Technology), Manisha Caleb (ANU), Duncan Campbell-Wilson (University of Sydney), Wael Farah (Swinburne University of Technology), Chris Flynn (Swinburne University of Technology), Anne Green (University of Sydney), Richard Hunstead (University of Sydney), Andrew Jameson (Swinburne University of Technology), Evan Keane (SKA Organisation), Vivek Venkatraman Krishnan (Swinburne University of Technology), Aditya Parthasarathy (Swinburne University of Technology), Willem van Straten (Swinburne University of Technology)
on 16 May 2016; 02:01 UT
Credential Certification: Fabian Jankowski (fjankowski@swin.edu.au)

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As part of the UTMOST project at the recently refurbished Molonglo Observatory Synthesis radio Telescope (MOST) near Canberra, Australia, we carry out a pulsar timing programme in which we observe a large number of pulsars with up to daily cadence.

We detected a glitch event in the timing data of the pulsar J1740-3015. Our preliminary analysis shows a change in its rotation frequency on MJD 57499.371 +- 0.004 (2016-04-21 08:54 UTC) by delta F0/F0 = (227.29 +- 0.03) E-9. The change in spin frequency is accompanied by a change in spin-down rate of delta F1/F1 = (2.19 +- 0.04) E-3.

This link shows a plot of the best maximum likelihood fit of our glitch model to our timing data: best fit of glitch model to post-fit residuals.

We will continue to observe the pulsar and we encourage other observers to help monitor the pulsar's glitch recovery.

In addition to the glitch discussed above we also report a smaller glitch, which happened on MJD 57346.0 +- 0.6 (2015-11-20 UTC) and has the following parameters: delta F0/F0 = (1.94 +- 0.02) E-9. It can be successfully fit by a change in spin frequency alone, for the change in spin-down rate we estimate a 3-sigma upper limit of |delta F1/F1| <= 0.07 E-3.

A plot of the small glitch can be found here: small glitch fit to post-fit residuals.