ALMA calibration data are public from the time the observations are taken, but most calibration data is contained in EBs that also contain proprietary data. You may submit a Helpdesk ticket to the Archive and Data Retrieval department to obtain the calibration data if you wish, and we will split it out from the EBs for you on a best-effort basis. 

Please make sure to specify the Project Code and calibrator you are looking to obtain in your helpdesk ticket.