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We present a fourth catalog of HI sources from the Arecibo Legacy Fast ALFA(ALFALFA) Survey. We report 541 detections over 136 deg2, within the region ofthe sky having 22h < R.A. < 03h and 24 deg < Dec. < 26 deg . This complements aprevious catalog in the region 26 deg < Dec. < 28 deg (Saintonge et al. 2008).We present here the detections falling into three classes: (a) extragalacticsources with S/N > 6.5, where the reliability of the catalog is better than95%; (b) extragalactic sources 5.0 < S/N < 6.5 and a previously measuredoptical redshift that corroborates our detection; or (c) High Velocity Clouds(HVCs), or subcomponents of such clouds, in the periphery of the Milky Way. Ofthe 541 objects presented here, 90 are associated with High Velocity Clouds,while the remaining 451 are identified as extragalactic objects. Opticalcounterparts have been matched with all but one of the extragalactic objects.

The Arecibo Legacy Fast ALFA Survey: VIII. HI Source Catalog of the Anti-Virgo Region at dec = +25 deg