TITLE: GCN CIRCULAR NUMBER: 16142 SUBJECT: GRB 140423A: Swift detection of a burst DATE: 14/04/23 08:44:16 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst E. Sonbas (NASA/GSFC/Adiyaman Univ.), M. M. Chester (PSU), K. L. Page (U Leicester) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 08:31:53 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140423A (trigger=596901). Swift did not slew immediately due to an observing constraint. The BAT on-board calculated location is RA, Dec 197.290, +49.815 which is RA(J2000) = 13h 09m 10s Dec(J2000) = +49d 48' 52" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a multi-peak structure with a duration of about 80 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~20 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+47.2 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.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.) [GCN OPS NOTE(23apr14): The second sentence was corrected to indicate a delayed (not immediate) slew.]