Marshall and I spent the afternoon (among loud children) pair-coding a system to fit his putative blended quasar pair; we developed some ideas about how to deal with the ideas that (1) the quasar positions could or should be generated by a lensing pattern, and that (2) the quasars might or might not vary according to a Gaussian process, and that (3) we might be able to measure the time delay and solve for lens parameters simultaneously with the de-blending operation. We didn't get very far, but these are all good ideas. And LSST-relevant.
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