Users interested in using alerts from real-time image subtractions should sign up for the GROWTH marshal
Archived images, catalogs, and lightcurves are available through IRSA. To get access, first register for an IRSA account, then send the email you registered to the program coordinator Ivona Kostadinova (ivonata@caltech.edu)
The ZTF also uses Slack for communication (ztfgeneral.slack.com). Ask Ivona Kostadinova to invite you.
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Follow the instructions here to get access to the forced photometry service.