GRB 060510B: Swift detection of a burst
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 5096
SUBJECT: GRB 060510B: Swift detection of a burst
DATE: 06/05/10 08:57:19 GMT
FROM: Scott Barthelmy at NASA/GSFC Scott@lheamail.gsfc.nasa.gov
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), M. Capalbi (ASDC), M.L. Conciatore (ASDC), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (GSFC/USRA), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC) and L. Vetere (ASDC) report on behalf of the Swift Team:
At 08:22:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060510B (trigger=209352). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 239.141, +78.559 {15h 56m 34s, +78d 33′ 33″} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Because this is an image trigger, the TDRSS BAT light curve does not show any significant activity around the trigger time, but we note that there is possible activity at T+150 and T+300 sec. This possible long duration could be an indication of a high redshift burst.
The XRT began observing the field at 08:24:13 UT, 119 seconds after the BAT trigger. XRT found a bright, possibly fading, uncatalogued X-ray source located at RA(J2000) = 15h 56m 29.3s, Dec(J2000) = +78d 34′ 09.4″, with an estimated uncertainty of 4.7 arcseconds (90% confidence radius). 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 7.1e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of nominal 100 seconds with the White (160-650nm) filter starting 129 seconds after the BAT trigger. No afterglow candidate has beeen found in the initial data products. The 8’x8′ region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for extinction.
We note that this is the second Swift burst within 38 minutes. Because the second burst (GRB 060510B) overwrites the first (GRB 060510A) in the on-board automated observing program, the NFI follow-up observations for GRB 060510A will not be available until that burst can be uploaded as a ToO during normal working hours at the Swift Mission Operations Center.
