TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5398 SUBJECT: GRB 060805: Swift detection of a burst DATE: 06/08/05 05:13:03 GMT FROM: Scott Barthelmy at NASA/GSFC H. Z. Ziaeepour (UCL-MSSL), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMD), N. Gehrels (NASA/GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), K. M. McLean (LANL/UTD), K. L. Page (U Leicester), M. J. Page (UCL-MSSL), D. M. Palmer (LANL) and T. Sakamoto (NASA/ORAU) report on behalf of the Swift Team: At 04:47:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060805 (trigger=222683). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 220.919, +12.592 {14h 43m 41s, +12d 35' 32"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about ~5 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began taking data at 04:49:22 UT, 93 seconds after the BAT trigger. Although the XRT on-board centroid algorithm did not find a source in the image, ground analysis reveals a faint source at RA, Dec 14h 43m 43.59s, +12 35 11.8 (J2000) with an uncertainty of 5.9 arcsec. UVOT took a finding chart exposure of 100 seconds with the white filter starting 97 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. Image catalog data are not available at this time. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction of about 0.1 magnitudes.