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We have adapted the Vera C. Rubin Observatory Legacy Survey of Space and Time(LSST) Science Pipelines to process data from the Gravitational-Wave OpticalTransient Observer (GOTO) prototype. In this paper, we describe how we used theRubin Observatory LSST Science Pipelines to conduct forced photometrymeasurements on nightly GOTO data. By comparing the photometry measurements ofsources taken on multiple nights, we find that the precision of our photometryis typically better than 20~mmag for sources brighter than 16 mag. We alsocompare our photometry measurements against colour-corrected PanSTARRSphotometry, and find that the two agree to within 10~mmag (1$\sigma$) forbright (i.e., $\sim14^{\rm th}$~mag) sources to 200~mmag for faint (i.e.,$\sim18^{\rm th}$~mag) sources. Additionally, we compare our results to thoseobtained by GOTO's own in-house pipeline, {\sc gotophoto}, and obtain similarresults. Based on repeatability measurements, we measure a $5\sigma$ L-bandsurvey depth of between 19 and 20 magnitudes, depending on observingconditions. We assess, using repeated observations of non-varying standard SDSSstars, the accuracy of our uncertainties, which we find are typicallyoverestimated by roughly a factor of two for bright sources (i.e., $<15^{\rmth}$~mag), but slightly underestimated (by roughly a factor of 1.25) forfainter sources ($>17^{\rm th}$~mag). Finally, we present lightcurves for aselection of variable sources, and compare them to those obtained with theZwicky Transient Factory and GAIA. Despite the Rubin Observatory LSST SciencePipelines still undergoing active development, our results show that they arealready delivering robust forced photometry measurements from GOTO data.

Processing GOTO data with the Rubin Observatory LSST Science Pipelines II: Forced Photometry and light curves