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Large glitch event observed in PSR J1731-4744

ATel #10770; Fabian Jankowski (Swinburne University of Technology [SUT]), Matthew Bailes (SUT), Ewan D. Barr (Max-Planck-Institut fur Radioastronomie), Timothy Bateman (The University of Sydney [USyd]), Shivani Bhandari (SUT), Manisha Caleb (University of Manchester), Adam Deller (SUT), Duncan Campbell-Wilson (USyd), Wael Farah (SUT), Chris Flynn (SUT), Anne J. Green (USyd), Richard W. Hunstead (USyd), Andrew Jameson (SUT), Evan F. Keane (SKA Organisation), Vivek Venkatraman Krishnan (SUT), Kathryn Plant (Caltech), Morgan O'Neill (SUT), Stefan Oslowski (SUT), Aditya Parthasarathy (SUT), Vikram Ravi (Caltech), Dave Temby (USyd)
on 24 Sep 2017; 08:10 UT
Credential Certification: Fabian Jankowski (fjankowski@swin.edu.au)

Subjects: Radio, Neutron Star, Transient, Pulsar

We detected a large glitch event in the timing data of the pulsar J1731-4744, which we monitor routinely as part of the pulsar timing programme at the Molonglo Observatory Synthesis Radio Telescope (UTMOST project). The UTMOST project is described by Bailes et al. 2017 (arXiv ID 1708.09619).

Our preliminary analysis indicates a fractional glitch size of dF0/F0 = (3147.7 +/- 0.1) E-9 (3 sigma), which makes it the largest glitch reported in this pulsar so far by a large margin, based on the ATNF glitch table and Jodrell Bank glitch database. There is no indication of a significant change in spin-down rate yet. The glitch epoch is only poorly constrained, as it happened in an observing gap. Our best estimate of the glitch epoch is MJD 57984.26 -18.3 +20.9 (UTC 2017-08-19), obtained when placing it near the centre of the gap and assuming zero glitch phase change. Note that the glitch could have happened as recently as UTC 2017-09-09 07:00.

Follow-up observations of this pulsar are encouraged to help refine the glitch characteristics.