The LMC X-ray pulsar PSR J0537-6910 is a young, energetic, and fast spinning (16 ms) X-ray pulsar that has not been detected as a radio pulsar. Various prior search efforts with Parkes were reported by Crawford et al. (1998), McLaughlin and Cordes (2003), and Crawford et al. (2005).
A re-analysis of this last and longest observation (11.6 hr of integration time) using the FETCH and HEIMDALL single pulse analysis packages has revealed 49 dispersed single radio pulses above a S/N of 7. It is not clear if any of these pulses originate from PSR J0537-6910 itself, and the pulses span a wide range of DMs. All of the pulses are also fairly weak, with none having S/N above 8.5. There are also three repeat pulses detected at a DM of 103 pc cm-3, which is within the LMC DM range).
These results are reported in "Detection of 49 Weak Dispersed Radio Pulses in a Parkes Observation of the X-ray Pulsar PSR J0537-6910" by F. Crawford, Astrophysical Journal, 968, 99 (2024).
Plots
All 49 waterfall detection plots generated by FETCH and reported in
the paper cited above are available for
viewing in PNG format.
Below: Pulse detection S/N as a function of DM for 49 pulses detection
in this 11.6 hr observation.
Addendum (March 2025)
A search of two additional archival Parkes observations of PSR
J0537-6910 from 2017 (Project P942) revealed a signal with DM 823 and
S/N of 9.0. This complements two of the pulses detected in the set of
49 in the original file which had DMs of 810 (S/N 8.5) and 839 (S/N
7.3). A comparison of the three signals can be seen in
these plots.
All three pulses are weak but have reasonable (and consistent)
morphologies. All three have consistent widths (512 bins,
corresponding to 30-40 ms in each case). However, these widths are
much larger than the 16 ms spin period of PSR J0537-6910 (so, they are
probably not from this pulsar). Could these signals be from a neutron
star at DM of around 800 in the LMC (embedded deep in plasma)?
