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We report the discovery of a thin stellar stream found in Pan-STARRS1photometry near the Galactic bulge in the constellation of Ophiuchus. Itappears as a coherent structure in the colour-selected stellar density mapsproduced to search for tidal debris around nearby globular clusters. The streamis exceptionally short and narrow; it is about 2.5{\deg} long and 6' wide inprojection. The colour-magnitude diagram of this object, which harbours a bluehorizontal-branch, is consistent with an old and relatively metal-poorpopulation ([Fe/H]~-1.3) located 9.5 +/- 0.9 kpc away at (l,b) ~(5{\deg},+32{\deg}), and 5.0 +/- 1.0 kpc from the Galactic centre. Theseproperties argue for a globular cluster as progenitor. The finding of such aprominent, nearby stream suggests that many streams could await discovery inthe more densely populated regions of our Galaxy.

Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge in the Pan-STARRS1 3Pi Survey