TITLE: GCN CIRCULAR NUMBER: 10348 SUBJECT: GRB 100119A: Swift detection of a burst DATE: 10/01/19 18:40:44 GMT FROM: Scott Barthelmy at NASA/GSFC V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), S. Campana (INAF-OAB), P.A. Curran (MSSL-UCL), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester), J. L. Racusin (NASA/GSFC), T. Sakamoto (NASA/UMBC), M. H. Siegel (PSU), M. C. Stroh (PSU), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team: At 18:25:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100119A (trigger=383063). Swift did not slew because of a Sun observing constraint. The BAT on-board calculated location is RA, Dec 299.327, -53.160 which is RA(J2000) = 19h 57m 18s Dec(J2000) = -53d 09' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple overlapping peaks with a duration of about 25 sec. The peak count rate was ~6000 counts/sec (15-350 keV), at T+5 sec. Due to an observing constraint, Swift cannot slew to the BAT position. There will thus be no XRT or UVOT data for this trigger. No observations with XRT or UVOT will be possible for approximately the next 26 days. Burst Advocate for this burst is V. Mangano (vanessa AT ifc.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.)