GBT
Green Bank Telescope clock correction file
This file records the difference between UTC(GBT) and UTC(GPS).
The observatory distributes this file on the Web, updated about daily.
A discrepancy arose between the observatory-distributed file and the file in this repository (which had been identical to the observatory-distributed one up to that point). Around 2023-03-20 (MJD 60023), the first ~11 entries in the observatory-distributed file were changed to zero. Ryan Lynch expressed surprise that this had occurred, but no resolution had arisen as of 2024-02-14. Since this resulted in the new file failing validation and the file in this repository not updating, at that point I (Anne Archibald) decided to switch those entries to match the observatory values. The old values are available from the version of the file in git tag “gbt-mystery-values”.
In May 2024, the values were changed back in the source file. This resulted in the file failing validation and refusing to update, again. As of February 2025, this should be fully resolved and the original values restored, on both ends.
If questions arise, contact Ryan S. Lynch rlynch@nrao.edu.
| File | tempo/clock/time_gbt.dat |
| Authority | observatory |
| URL in repository | https://raw.githubusercontent.com/ipta/pulsar-clock-corrections/main/tempo/clock/time_gbt.dat |
| Original download URL | https://www.gb.nrao.edu/~fghigo/timer/time_gbt.dat |
| Format | tempo |
| Bogus last correction | False |
| Clock file start | 2000-12-31 MJD 51909.5 |
| Clock file end | 2025-02-12 MJD 60718.5 |
| Update interval (days) | 1 |
| Last update attempt | 2025-02-13 |
| Last update result | Updated |
Log entries from the last few update attempts:
2025-02-04 20:35:58.203 - Validation failed: New version of tempo/clock/time_gbt.dat clock corrections differ from old version where they overlap in 11 places
2025-02-05 20:37:00.165 - Validation failed: New version of tempo/clock/time_gbt.dat clock corrections differ from old version where they overlap in 11 places
2025-02-06 20:35:34.626 - Validation failed: New version of tempo/clock/time_gbt.dat clock corrections differ from old version where they overlap in 11 places
2025-02-07 20:35:48.148 - Updated
2025-02-08 20:33:46.179 - Updated
2025-02-09 20:33:00.330 - Updated
2025-02-10 20:36:31.721 - Updated
2025-02-11 20:36:33.614 - Updated
2025-02-12 20:36:25.432 - Updated
2025-02-13 20:35:52.966 - Updated
All clock corrections:
Recent clock corrections:
