TITLE: GCN CIRCULAR NUMBER: 14682 SUBJECT: GRB 130518B found in ground analysis of Swift-BAT data DATE: 13/05/20 14:04:04 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (UMBC/CRESST/GSFC) reports on behalf of the Swift-BAT team: At 10:50:38 UTC, Swift-BAT triggered on GRB 130418A (trigger # 556105). A sub-threshold source was found onboard. In ground analysis, a source was confirmed at RA, Dec 321.555, -20.148, which is: RA (J2000) 21h 26m 13.2s Dec (J2000) -20d 08m 53s with an estimated uncertainty of 1.8 arcmin radius (90% confidence). The burst as seen in BAT was a single FRED peak of approximately 15 seconds duration. A Swift TOO request has been submitted and approved to locate the afterglow.