TITLE: GCN CIRCULAR NUMBER: 6818 SUBJECT: GRB 070923: Swift detection of a short hard burst DATE: 07/09/23 19:26:48 GMT FROM: Scott Barthelmy at NASA/GSFC M. C. Stroh (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), D. Grupe (PSU), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), A. M. Parsons (GSFC), J. L. Racusin (PSU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 19:15:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070923 (trigger=292004). The BAT on-board calculated location is RA, Dec 184.626, -38.268 which is RA(J2000) = 12h 18m 30s Dec(J2000) = -38d 16' 03" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 100 msec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~0.0 sec after the trigger. Because Swift is in the process of returning to normal operations, automatic slewing to GRBs is currently disabled. Therefore, there are no prompt XRT or UVOT observations of this burst. This burst is 38 deg from the Sun and so is too close for later XRT observations. Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 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.)