NuSTAR CALDB Release Version: 20250331
 
This release includes a new release of the CLOCKFILE, v202

released at the HEASARC: 2025-04-07
 
CLOCKFILE:
==========
 
This is an update of the NuSTAR clock correction file. As of March 2025, the clockfile is being generated with an updated temperature model and is expected to be accurate for all observations taken prior to its release, although the fit may still improve slightly in subsequent releases for observations taken in the two weeks prior to the generation of this version of the clockfile. Details and comparisons to the previous clock correction file can be found here:
 
http://www.srl.caltech.edu/NuSTAR_Public/NuSTAROperationSite/clockfile.php
 
The clock correction file keeps the NuSTAR relative time (after barycentric corrections) accurate to better than 100 microseconds and accounts for drifts in the NuSTAR clock caused by temperature variations.
 
This clockfile is compatible with the current version of barycorr. See the above link or the barycorr fhelp file for its usage.
 
There was an issue with the NuSTAR ground station clock between 2021/07/30 and 2021/08/04. As of this release, the clockfile performance appears to be nominal during this period. But please see the NuSTAR SOC Clockfile page for a list of potentially affected sequence IDs and targets and, if there are any anomalous timing signatures for these observations, please contact the NuSTAR SOC for guidance.