A glitch in the highly magnetised radio pulsar PSR B1737-30

ATel #17486; Benjamin Shaw (University of Manchester), Danai Antonopoulou (UoM), Michael J. Keith (UoM), Andrew G. Lyne (UoM), Mitchell B. Mickaliger (UoM), Benjamin W. Stappers (UoM), Patrick Weltevrede (UoM).
on 8 Nov 2025; 15:44 UT
Credential Certification: Benjamin Shaw (benjamin.shaw@manchester.ac.uk)

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We report the detection of a glitch in the radio pulsar PSR B1737-30 (PSR J1740-3015), which we monitor as part of the Jodrell Bank Pulsar Timing Programme. PSR B1737-30 is observed approximately weekly with the Lovell Telescope at the Jodrell Bank Observatory, using a 384 MHz bandwidth centred at 1532 MHz. This is the 38th glitch observed in this pulsar, occurring roughly three years after the previously reported event in 2022. Preliminary analysis indicates a fractional rotational frequency increase of dF0/F0 = 2.810(3)e-06 (1 sigma uncertainty). This makes it the largest glitch recorded in this source, marginally exceeding the previous record event (dF0/F0 = 2.663e-6). The glitch epoch is currently estimated as MJD 60980(5). At present, we find no evidence for transient post-glitch recovery or any significant change in the spin-down rate of the star. We continue to monitor the pulsar daily with enhanced cadence in order to refine the glitch measurement. PSR B1737-30 is among the most strongly magnetised rotation-powered pulsars known, with a surface dipole magnetic flux density of approximately 1.7e13 G. Observations at other facilities, particularly high-energy instruments, are encouraged to confirm the glitch and to search for any radiative changes associated with this event.