/users/DET/Segments/K1-GRD_SCIENCE_MODE/yyyy/K1-GRD_SCIENCE_MODE_SEGMENT_UTC_yyyy-mm-dd.{txt,xml}
XML file is a compatible format with the DataQualityFlag class in gwpy.
Text file format is
start_gps end_gps
So the end_gps shows the lockloss time or the start of maintenance works.
O4 segments can be easily seen by
> /users/DET/tools/Segments/Script/RevealSegments/reveal_science_O4a.sh
Attachment is sample output of this script.
