With a rotation period of 53.8 minutes (more precisely, 3,225.313±0.002 seconds[1]), it would be the slowest spinning neutron star ever discovered.
[2] ASKAP J1935+2148 was discovered while observing the same area as gamma-ray burst GRB 221009A, which had occurred a few days earlier, with the first pulses being detected on 15 October 2022 by the Australian Square Kilometre Array Pathfinder telescope, located in Western Australia, from which it derives its name.
[3] The first observation lasted six hours, in which four 10- to 50-second pulses were detected, with the peak flux density being 119 mJy.
The pulses were quantified to be >90% linearly polarised with a rotation measure of 159.3±0.3 rad m−2, consistent with nearby pulsars.
Observations at 1,284 MHz with the MeerKAT radio interferometer, including estimating the time of arrival of future pulses, were used to determine a rotation period of 3,225.313±0.002 seconds.