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Update omicron_virgo authored by Florent Robinet's avatar Florent Robinet
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omicron_virgo.md
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Omicron triggers are produced continuously with dedicated online processes (see the [detchar processes in vpm](https://vpm.virgo.infn.it:40000/main.html?subsystem=DetChar)). Hundreds of channels are processed and triggers are saved to disk. These triggers can be used by anybody for glitch investigations.
Triggers are saved in ROOT files following the `GWOLLUM` convention for triggers.
Triggers are saved in ROOT files following the [DetChar veto trigger conventions](https://dcc.ligo.org/LIGO-T1500286).
During O3, new trigger files could be found in:
The most recent trigger files, produced with low latency, can be found in:
```
/data/omicron/V1
/data/online/omicron/
```
**This default path is likely going to change for the pre-O4 commissioning and the O4 data taking.**
For most cases, the trigger file location and/or format is irrelevant as Omicron triggers can be accessed automatically by [omicron programs](home#programs). This will only work if the environment variable `OMICRON_TRIGGERS` is correctly set:
Omicron trigger files are periodically merged and transferred to:
```
/data/prod/omicron/
```
For most cases, the trigger file location and/or format is irrelevant as Omicron triggers can be accessed automatically by [omicron programs](home#programs). This will only work if the environment is correctly set:
```
$ echo $OMICRON_TRIGGERS
/data/omicron
/data/prod/omicron
$ echo $OMICRON_TRIGGERS_ONLINE
/data/online/omicron
```
Following a reorganization of the storage area at Cascina, the Omicron trigger file location is currently (O3) only accessible from online machines: `detchar1` or the `ctrl` machines but not the `farmn` machines. Moreover, O3 triggers have now been moved to `/data/archive/detchar/O3/omicron/V1` (archive area). To access these triggers automatically, the `OMICRON_TRIGGERS` must be redefined:
Old trigger files (O3) must be found to `/data/archive/detchar/O3/omicron/V1` (archive area). To access these triggers automatically, the `OMICRON_TRIGGERS` must be redefined:
```
export OMICRON_TRIGGERS=/data/archive/detchar/O3/omicron
```
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