NuSTAR CALDB Release Version: 20181022

Release Type: Clock Correction Update

Summary of changes: 

CLOCK:

An updated NuSTAR clock correction file, version 86, is available. This file is
up to date through 2018-10-22, The latest clock file is available from the SOC
public website:

http://www.srl.caltech.edu/NuSTAR_Public/NuSTAROperationSite/clockfile.php

The magnitude of the clock drift rose to just over 100 ms starting on 2018-10-13
(day 3207 on the plot) due to the way the automated adjustment of the clock
divisor had been set up and an unusually large drift. This has now been fixed by
expanding the range of clock drift that is automatically corrected. This is
accounted for in the spline fit that is presented in the clock correction file,
where the residuals remain within +/- 2 ms. However, the large drift will be
noticeable if timing analysis is performed without using the clock correction
file.