TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5252 SUBJECT: GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart DATE: 06/06/14 13:04:09 GMT FROM: Ann M. Parsons at NASA/GSFC/Swift A. M. Parsons (GSFC), J. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC), M. R. Goad (U Leicester), C. Gronwall (PSU), S. T. Holland (GSFC/USRA), J. A. Kennea (PSU), V. La Parola (INAF-IASFPA), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), K. M. McLean (LANL/UTD), C. Pagani (PSU), D. M. Palmer (LANL), P. Romano (INAF-OAB) and M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team: At 12:43:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060614 (trigger=214805). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 320.862, -53.034 {21h 23m 27s, -53d 02' 02"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 120 sec, with initial bright sharp peak and a long, also bright, somewhat softer extended peak. The peak count rate was ~10000 counts/sec (15-350 keV), at ~2 sec after the trigger. The XRT began observing the field at 12:45:19 UT, 91 seconds after the BAT trigger. XRT found a very bright, fading and uncatalogued X-ray source located at RA(J2000) = 21h 23m 32.3s, Dec(J2000) = -53d 01' 32.1", with an estimated uncertainty of 5.0 arcseconds (90% confidence radius). This location is 58 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 0.1s image was 6.0e-08 erg/cm2/s (0.2-10 keV). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 102 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at (RA,DEC) (J2000) of (320.8839,-53.0267) or (21h23m32.14s,-53o01'36.1") with a 1-sigma error radius of about 0.5 arc sec. This position is 4.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.4 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.