TITLE: GCN CIRCULAR NUMBER: 22325 SUBJECT: GRB 180113A: Swift detection of a burst DATE: 18/01/13 02:58:25 GMT FROM: David Palmer at LANL T. N. Ukwatta (LANL), J. R. Cummings (NASA/UMBC), A. D'Ai (INAF-IASFPA), V. D'Elia (ASDC), A. Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 02:47:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180113A (trigger=804999). Due to an observing constraint, Swift could not slew to this burst. The BAT on-board calculated location is RA, Dec 19.215, +68.682 which is RA(J2000) = 01h 16m 52s Dec(J2000) = +68d 40' 55" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 20 sec. The peak count rate was ~9000 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not be able to observe this location until at least T0+36 hours. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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.)