TITLE: GCN CIRCULAR NUMBER: 14936 SUBJECT: GRB 130627B: Swift detection of a burst DATE: 13/06/27 12:12:55 GMT FROM: David Palmer at LANL S. R. Oates (UCL-MSSL), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), S. T. Holland (STScI), A. Y. Lien (NASA/GSFC/ORAU), D. Malesani (DARK/NBI), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 12:00:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130627B (trigger=559139). Due to an Earth limb constraint Swift could not immediately slew to the burst. The BAT on-board calculated location is RA, Dec 181.932, -55.730 which is RA(J2000) = 12h 07m 44s Dec(J2000) = -55d 43' 47" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 40 sec. The peak count rate was ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+48.4 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is S. R. Oates (samantha.oates AT ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)