NuSTAR CALDB Release Version: 20230307
 
This release includes a new release of the CLOCKFILE, v155

released at the HEASARC: 2023-03-07
 
CLOCKFILE:
==========
 
This is an update of the NuSTAR clock correction file. 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.
 
Due to the nature of the clockfile correction, we note that the timing solution may improve for the ~14 days prior to the generation of the clockfile as more data are incorporated into the fit. For high precision timing of very recent observations we recommend either waiting for the next clock file update or contacting the NuSTAR SOC for assistance.

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.