Kavli Affiliate: Eric D. Miller
| First 5 Authors: Yukikatsu Terada, Megumi Shidatsu, Makoto Sawada, Takashi Kominato, So Kato
| Summary:
This paper describes the development, design, ground verification, and
in-orbit verification, performance measurement, and calibration of the timing
system for the X-Ray Imaging and Spectroscopy Mission (XRISM). The scientific
goals of the mission require an absolute timing accuracy of 1.0~ms. All
components of the timing system were designed and verified to be within the
timing error budgets, which were assigned by component to meet the
requirements. After the launch of XRISM, the timing capability of the
ground-tuned timing system was verified using the millisecond pulsar
PSR~B1937+21 during the commissioning period, and the timing jitter of the bus
and the ground component were found to be below $15~mu$s compared to the NICER
(Neutron star Interior Composition ExploreR) profile. During the performance
verification and calibration period, simultaneous observations of the Crab
pulsar by XRISM, NuSTAR (Nuclear Spectroscopic Telescope Array), and NICER were
made to measure the absolute timing offset of the system, showing that the
arrival time of the main pulse with XRISM was aligned with that of NICER and
NuSTAR to within $200~mu$s. In conclusion, the absolute timing accuracy of the
bus and the ground component of the XRISM timing system meets the timing error
budget of $500~mu$s.
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