Difference: ZtfArchive (1 vs. 2)

Caveats and Issues

• Objects are constructed from all available points, but lightcurve points can only be retrieved if the user has appropriate permissions (e.g., partnership membership for partnership data). Clicking on the "To Time Series" tool gives a blank screen if there is no lightcurve data the user has permission to see. As an example, as of 2018-08-06, the example ra, dec (298.0 29.87) returns no points for logged-in partnership users. 269.84158 45.35492 does return values.

IRSA ZTF Archive

Lightcurve GUI

The lightcurve GUI to retrieve archival lightcurves is online now. The lightcurves are based on the matchfiles and hence on reference image coverage which will gradually improve.

• go to: https://irsa.ipac.caltech.edu/Missions/ztf.html
• login using your IRSA registered account at top right. You need to have access rights to ZTF. If you do not have this send a request to the ZTF communication coordinators
• Click on “Catalog Search” icon.
• select the ZTF Objects Table -- this enables you to query targets ingested from the matchfiles (reference image catalogs used to seed the matchfiles); you can filter on the collapsed-lightcurve metrics if needed; you can also upload a table of RA, Decs.
• lightcurve metrics are returned with an overlay on a 2mass image (this will be replaced by the ztf ref image)
• send all these objects to the Time Series tool by clicking on the “To Time Series tool” icon.
• you will be presented with a list of all the object IDs from which you can either download all the lightcurves in one concatenated ascii table, OR, click on any objectID to send it to the Time Series viewer.
• on the Time Series viewer, you will see a sliding window of epochal image cutouts and a "Period Finder…” icon. Click on this to phase the lightcurve using a set of trial periods. You can instead click on “Calculate periodogram...” to help find the period.
• Documentation is at: https://irsa.ipac.caltech.edu/onlinehelp/irsaviewer/#id=preoverview; all this is shared with other projects.

A caveat at present is that large cone searches (>~ 5 arcmin) take a long-term to return lightcurves. This is being looked at.