Archiving of the Data

The data produced at ESO telescopes during each observing night, as well as their daytime calibrations, are stored in the ESO Archive. With the ESO Archive Query Form, users can obtain information on the observations done with ESO telescopes and their instruments.

All ESO scientific data are subjected to a proprietary period of one year since the date when they were distributed to the Principal Investigator, or since the date when they were obtained in the case of Visitor Mode observations. After the proprietary period, the data become public and anyone can retrieve them by means of an archive request. Calibration data are not subjected to any proprietary period and they can be requested as soon as they are available in the Archive.

All calibration data from the VLT are processed and quality-checked by the Quality Control and Data Processing Group. The calibration products are then archived.

Instrument selector

This page is valid for all instruments