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Fig. 2.

image

Illustration of PSF-fit likelihood for the source position and the prediction by our simultaneous proper motion fit for the CCO of G15.9+0.2. Each column shows data from the individual epochs (with the observation ID displayed in the title), while each row represents one particular object. The one to five sigma contours of the PSF-fit likelihood ℒij(x, y) are shown in green, and the predicted positions obtained from our simultaneous fit (see posterior distribution in Fig. 4) are indicated using a grayscale two-dimensional histogram. In the lower left corner of each panel, we provide a reference scale of length 0.3″. We display the true source position for our calibrator stars (known from Gaia) with a blue star. The uncertainty contours for observation 16766 are by far the smallest since the corresponding exposure was much deeper than at the other epochs (at ∼90 ks).

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