for the motion of the satellite and Earth’s orbit using [*faxbary*]{} to give the arrival times at the solar system barycenter.

### Correcting for Collimator Response

For every pulsar with a well known position, the detector sensitivity ($R$) was calculated at each pointing position. The collimator for each PCU are constructed from corrugated sheets with hexagonal cells. The hexagonal cells have small offsets in pointing direction and the angular responses for each PCU are different. For the purposes of examining long term light curves we adopt a simplified model for the collimators of a circular field of view with a simple triangular collimator response of full-width half maximum (FWHM) = 1, full-width zero intensity (FWZI) = 2. This simplified model differs from the true collimator response in being somewhat sharper peaked, lacking extended wings at larger angles (where we do not have significant pulsar detections) and lacking the hexagonal symmetry which is also most pronounced at larger offset angles. The use of this simplified model speeds data analysis and is not a significant factor in, for example, searching for periodic behavior. With our simplified collimator model, for a particular pulsar at known distance from the pointing center, $R$ equals 1.0 