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Bachetti, Matteo; Markwardt, Craig B.; Grefenstette, Brian W.; Gotthelf, Eric V.; Kuiper, Lucien; Barret, Didier; Cook, W. Rick; Davis, Andrew; Fürst, Felix; Forster, Karl; Harrison, Fiona A.; Madsen, Kristin K.; Miyasaka, Hiromasa; Roberts, Bryce; Tomsick, John A.; Walton, Dominic J.
Astrophysical journal/The Astrophysical journal, 02/2021, Letnik: 908, Številka: 2Journal Article
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 s.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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