NASA Swift: GRB 060510: Swift detection of a burst with optical transient
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 5095
SUBJECT: GRB 060510: Swift detection of a burst with optical transient
DATE: 06/05/10 08:33:55 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), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC), E. Troja (INAF-IASFPA) and L. Vetere (ASDC) report on behalf of the Swift Team:
At 07:43:27 UT, Swift-BAT triggered and located GRB 060510 (trigger=209351). The spacecraft slewed immediately. The BAT on-board calculated location is RA,Dec 95.870d,-1.162d {06h 23m 29s,-1d 09′ 43″} (J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows a multi-peak structure with a total duration of ~30 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~1 seconds after the trigger.
The XRT began observing the field at 07:44:57 UT, 90 seconds after the BAT trigger. The on-board centroiding algorithm was confused by a cosmic ray close to the X-ray afterglow and the position sent out in the automated GCN Notice was incorrect. Using ground-processed data, we find a bright X-ray source located at RA(J2000) = 06h 23m 28.1s, Dec(J2000) = -01d 09′ 44.9″, with an estimated uncertainty of 8 arcseconds (90% confidence radius). This location is 11 arcseconds from the BAT on-board position, within the BAT error circle.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 100 seconds after the BAT trigger. A fading source was found at RA,Dec = 06h 23m 28.0s -1d 09′ 46″ (J2000) with a mag of 18.2. There is nothing in DSS. No correction has been made for the expected extinction corresponding to E(B-V) of 0.41.
This burst (trigger 209351) should not be confused with the second Swift-BAT trigger (209352) 38 minutes later.
