ESO Archive Frequently Asked Questions

What is the relation between instrument IDs and prefixes of archival dataset identifiers for raw data?

An archival dataset identifier (also known as DP ID) for raw data is composed of a prefix, followed by a timestamp up to the millisecond.
The prefix usually corresponds to the instrument ID (ins_id parameter in the main archive query form).
Example: instrument ID = UVES, archive filename = UVES.2009-03-20T09:22:28.489

However, there are a few exceptions which are listed below:

instrument ID DP ID prefix(es)
EMMI ONTT
FORS FORS1, FORS, or OFORS
GIRAFFE GIRAF
ISAAC ISAAC or OISAAC
NAOS+CONICA NACO
SINFONI SINFO
SOFI ONTT
SUSI, SUSI2 ONTT
VIRCAM VCAM
SHOOT
XSHOOTER
SHOOT
XSHOO
OmegaCAM OMEGA

The query forms take care of the equivalence between instruments and their different DP ID prefixes and instrument IDs, but the user should take into account that for some instruments it is not possible in all cases to tell, just from the DP ID or file name, which instrument was used to generate a particular FITS file.