TITLE: GCN CIRCULAR NUMBER: 14731 SUBJECT: GRB 130603A: Swift detection of a burst DATE: 13/06/03 06:08:14 GMT FROM: David Palmer at LANL A. Melandri (INAF-OAB), C. Gronwall (PSU), C. B. Markwardt (NASA/GSFC), D. M. Palmer (LANL) and T. Sakamoto (AGU) report on behalf of the Swift Team: At 05:59:32 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130603A (trigger=557274). Swift could not immediately slew to the burst due to an Earth limb constraint. The BAT on-board calculated location is RA, Dec 86.954, +82.934 which is RA(J2000) = 05h 47m 49s Dec(J2000) = +82d 56' 02" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED structure with a duration of about 100 sec. The peak count rate was ~1275 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+49.7 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.it). 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.)