Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge   in the Pan-STARRS1 3Pi Survey
  We report the discovery of a thin stellar stream found in Pan-STARRS1 photometry near the Galactic bulge in the constellation of Ophiuchus. It appears as a coherent structure in the colour-selected stellar density maps produced to search for tidal debris around nearby globular clusters. The stream is exceptionally short and narrow; it is about 2.5{\deg} long and 6' wide in projection. The colour-magnitude diagram of this object, which harbours a blue horizontal-branch, is consistent with an old and relatively metal-poor population ([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. These properties argue for a globular cluster as progenitor. The finding of such a prominent, nearby stream suggests that many streams could await discovery in the more densely populated regions of our Galaxy. 
Edouard J. Bernard, Annette M. N. Ferguson, Edward F. Schlafly,   Mohamad Abbas, Eric F. Bell, Niall R. Deacon, Nicolas F. M...
astro-ph.GA