GCN Circular 14676
J. R. Cummings (UMBC/CRESST/GSFC) reports on behalf of the BAT team At 13:55:07.4 UT, the Swift Burst Alert Telescope (BAT) triggered on the Fermi GBM and LAT GRB 130518A (Xiong, GCN # 14674 and Omodei et al., GCN# 14675) (BAT trigger=556113). No significant source was found onboard. In ground analysis, a significant source was found at RA, Dec 355.671, +47.478 which is: RA(J2000) =23h 42m 41.1s Dec(J2000) = +47d 28' 41.5" with an uncertainty of 2.9 arcmin (radius, 90% containment, including systematic uncertainty). This position is 11 arcmin from the LAT position, within the LAT error circle. BAT partial coding was 5%. The unweighted lightcurve shows two overlapping peaks with a duration of about 14 sec. The peak count rate was ~9400 counts/sec (15-350 keV), at ~4 sec before the trigger.