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19 April 2024

» arxiv » 2009.10347

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Timing Calibration of the NuSTAR X-ray Telescope
Matteo Bachetti ; Craig B. Markwardt ; Brian W. Grefenstette ; Eric V. Gotthelf ; Lucien Kuiper ; Didier Barret ; W. Rick Cook ; Andrew Davis ; Felix Fürst ; Karl Forster ; Fiona A. Harrison ; Kristin K. Madsen ; Hiromasa Miyasaka ; Bryce Roberts ; John A. Tomsick ; Dominic J. Walton ;
Date:	22 Sep 2020
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.
Source:	arXiv, 2009.10347
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