This note describes the what information about single exposure photometric calibration will be available in the headers of postage stamp images.

PS1 exposures are calibrated photometrically in multiple stages of the pipeline.

• During the camera stage psastro compares the point sources detected at the chip stage with a reference catalog and computes the astrometric solution and measures the photometric zero point.
• The ubercal process [XXX: insert reference] the zero points are refined which are inserted into the DVO catalog.
• During DVO calibration exposures psastro that were not ubercaled are calibrated using [XXX: insert reference or text describing the process]. New zero points are measured for the non-ubercal exposures, ubercal exposures keep the zero points measured there.

It has been requested that the IPP postage stamp server include calibration information in the headers of the postage stamps. This project is in the process of being implemented. After DVO calibration the resulting information will be extracted and saved in the IPP metadata database (the mysql database named gpc1). The postage stamp server will include the data in the postage stamp FITS headers.

The following table describes the associated keywords that will give the