Timing Calibration of the NuSTAR X-ray Telescope

Abstract

The Nuclear Spectroscopic Telescope Array (NuSTAR) mission is the first focusing X-ray telescope in the hard X-ray (3-79 keV) band. Among the phenomena that can be studied in this energy band, some require high time resolution and stability: rotation-powered and accreting millisecond pulsars, fast variability from black holes and neutron stars, X-ray bursts, and more. Moreover, a good alignment of the timestamps of X-ray photons to UTC is key for multi-instrument studies of fast astrophysical processes. In this Paper, we describe the timing calibration of the NuSTAR mission. In particular, we present a method to correct the temperature-dependent frequency response of the on-board temperature-compensated crystal oscillator. Together with measurements of the spacecraft clock offsets obtained during downlinks passes, this allows a precise characterization of the behavior of the oscillator. The calibrated NuSTAR event timestamps for a typical observation are shown to be accurate to a precision of ~65 microsec.

arXiv comment13 pages, 10 figures. Comments welcome

References in corpus (18)

• emcee: The MCMC Hammer
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The ATNF Pulsar Catalogue
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Binary and Millisecond Pulsars
• The NANOGrav 11-year Data Set: High-precision timing of 45 Millisecond Pulsars
• Calibration of the NuSTAR High Energy Focusing X-ray Telescope
• Stingray: A Modern Python Library For Spectral Timing
• No Time for Dead Time: Timing analysis of bright black hole binaries with NuSTAR
• The soft gamma-ray pulsar population: an high-energy overview
• Accreting Millisecond X-Ray Pulsars
• High-energy characteristics of the schizophrenic pulsar PSR J1846-0258 in Kes 75
• Detection of Pulsed X-ray Emission from The Fastest Millisecond Pulsar PSR B1937+21 with ASCA
• No Time for Dead Time: Use the Fourier Amplitude Differences to Normalize Dead-time-affected Periodograms
• High-Precision X-ray Timing of Three Millisecond Pulsars with NICER: Stability Estimates and Comparison with Radio
• NuSTAR Hard X-ray Observations of the Energetic Millisecond Pulsars PSR B1821-24, PSR B1937+21, and PSR J0218+4232
• Chandra and RXTE studies of the X-ray/gamma-ray millisecond pulsar PSR J0218+4232
• Timing accuracy of the Swift X-Ray Telescope in WT mode

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