NuSTAR CALDB Release Version: 20180419 Release Type: Clock Correction Update Summary of changes: CLOCK: An updated NuSTAR clock correction file, version 80, is available. This file is up to date through 2018-04-18, compared to 2018-03-12 in the previous version (79). The latest clock file is available from the SOC public website: http://www.srl.caltech.edu/NuSTAR_Public/NuSTAROperationSite/clockfile.php Remember to use right-click or control-click to save the file. The residuals remain within +/- 2 ms for the interval covered by the update.