TITLE: GCN CIRCULAR NUMBER: 12316 SUBJECT: Swift detection of an SGR burst from Swift J1834.9-0846 DATE: 11/08/30 00:08:52 GMT FROM: David Palmer at LANL E. A. Hoversten (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU), D. Grupe (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), D. M. Palmer (LANL), C. J. Saxton (UCL-MSSL), C. A. Swenson (PSU), E. Troja (NASA/GSFC/ORAU), C. A. Wolf (PSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team: At 23:41:12 UT, the Swift Burst Alert Telescope (BAT) triggered on Swift J1834.9-0846 (trigger=501752). Swift will have a delayed slew due to the Earth limb. The BAT on-board calculated location is RA, Dec 278.721, -8.751 which is RA(J2000) = 18h 34m 53s Dec(J2000) = -08d 45' 04" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This is less than 1 arcmin from the position of Swift J1834.9-0846. BAT has detected this source several times since August 7, 2011 (D'Elia et al. GCN Circ #12253). The BAT light curve showed a single short soft peak with a duration of about 0.016 sec. The peak count rate was ~3200 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+45.7 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is E. A. Hoversten (hoversten AT astro.psu.edu). 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.)