TITLE: GCN CIRCULAR NUMBER: 6620 SUBJECT: GRB 070714: Swift detection of a bright burst, possibly short DATE: 07/07/14 05:28:15 GMT FROM: Scott Barthelmy at NASA/GSFC J. L. Racusin (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL) and T. Sakamoto (NASA/ORAU) report on behalf of the Swift Team: At 04:59:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070714 (trigger=284856). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 57.854, +28.295 which is RA(J2000) = 03h 51m 25s Dec(J2000) = +28d 17' 43" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a duration of 3 seconds with a spike to a peak of 20000 counts/s (15-350 keV) at T+0.2 s. The XRT began observing the field at 05:00:30 UT, 61 seconds after the BAT trigger. Using ground processed data, XRT found a bright, fading, uncatalogued X-ray source located at RA, Dec 57.8423, +28.2978 which is RA(J2000) = 03h 51m 22.1s Dec(J2000) = 28d 17' 52.0" with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 39 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 2.4e-09 erg/cm2/s (0.2-10 keV). The UVOT began observing the field at 05:00:40.05 UT, 70.4 s after the BAT trigger. No counterpart is apparent in the 2.7' x 2.7' subimage, based on visual comparison with the DSS. Additional processing is underway. Burst Advocate for this burst is J. L. Racusin (racusin 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.)