The Pan-STARRS1 telescope carried out a "Medium Deep" Survey between 2010 and 2014, consisting of nightly long exposure visits to 10 pre-defined pointings in grizy (PS1 specific filters). A nightly stack of 8 dithers was produced and differenced with respect to an annually produced deep, high quality reference stack.

During the same period the telescope also carried out the "3Pi Survey" of the whole sky north of -30 degrees in grizy (PS1). Each region on the sky was typically visited four times a year in each filter. An all sky image of these stacked frames was created in each band and all individual exposures since mid-June 2013 were differenced with respect to this static sky.

Although these surveys completed in early 2014, the PS1 telescope has been subsequently running a wide-field NASA funded survey for near earth objects. This survey takes data in w-band in dark time, and combinations of i, z and y during bright moon time. Since December 2014 these data are being processed through the difference imaging pipeline and stationary transients recovered.

The transient detection catalogues are ingested into an SQL database, aggregated into objects and filtered. The filtered objects are presented via a web interface to human scanners who promote them if real. Recently a machine learning algorithm has been implemented which scans the images and delivers a small subset to human scanners. In Medium Deep we discovered ~6000 transients (with 10% spectroscopically verified). In the 3pi Survey over 2200 have been discovered (4% spectroscopically confirmed).