GD-1 stream paper done

Working on the weekend and today, we finished Koposov's paper on the GD-1 cold stellar stream. His constraints on the Galaxy potential are significant; we have the (formally) best current constraint on the Galaxy circular velocity, and we constrain the flattening of the dark-matter halo (though not at awesome precision). Congratulations, Koposov! It will hit the arXiv within days.

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