the photon PSF

I wrote a tiny snippet of code to fit a PSF (plus sky level) to a photon stream from a (bright enough) source in the GALEX photon catalog. This is just for vetting; we need to know if our spacecraft attitude model is giving us as good imaging quality as the official GALEX pipeline products. Also spent the morning chatting with Schiminovich and Greenberg, who are distracting me away from the Atlas with beautiful visualizations of thousands of GALEX photons.

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