Detection of a new glitch in the pulsar PSR J1740-3015

ATel #15838; E. Zubieta (IAR), S. B. Araujo Furlan (IAR), S. del Palacio (Chalmers University of Technology, IAR), F. Garcia (IAR), G. Gancio (IAR), C. O. Lousto (RIT), J. A. Combi (IAR, FCAGLP, UJA), L. Combi (IAR), on behalf of the PuMA Collaboration
on 31 Dec 2022; 19:25 UT
Credential Certification: Federico Garcia (fgarcia@iar.unlp.edu.ar)

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At the Argentine Institute of Radio astronomy (IAR), we carry out a pulsar-timing program in which we observe a series of pulsars from the Southern Hemisphere with up to daily cadence, as part of the PuMA project. Observations are performed at a central frequency of 1400 MHz with the two 30 m antennas, with a bandwidth of 112 MHz and a single polarization on Antenna 1 (A1) and a bandwidth of 56 MHz and two polarizations on Antenna 2 (A2).

We detected a glitch event in the timing data of the radio pulsar PSR J1740-3015. For this pulsar, 37 glitches have been reported before, with relative frequency jumps ranging between 0.7(4)E-9 and 2659(4)E-9. We observed PSR J1740-3015 with A2 during 38 minutes on MJD 59934.7 (2022-12-21 UTC), right before the glitch, and during 109.8 minutes on MJD 59935.5 (2022-12-22 UTC), right after the glitch. Our preliminary analysis yields a relative frequency change of dF0/F0 = 332(3)E-9 (1 sigma). Currently, we constrain the glitch epoch to be MJD 59935.1+/-0.4 (see attached plot).

We will continue to monitor PSR J1740-3015 to improve the post-glitch timing solution.