[vsnet-grb-info 3241] GRB 060505: Swift-BAT detection of a weak burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5076
SUBJECT: GRB 060505: Swift-BAT detection of a weak burst
DATE:    06/05/05 20:35:05 GMT
FROM:    Jay R. Cummings at NASA/GSFC/Swift  <jayc at milkyway.gsfc.nasa.gov>

D. Palmer, J. Cummings, M. Stamatikos, C. Markwardt, T. Sakamoto 


At 06:36:01 UT Swift-BAT triggered on GRB 060505 (Trigger #208654).
The onboard imaging detected a 6.4 sigma excess.
This is below our (6.5 sigma) threshold for ground notification
and automatic slew.  Subsequent ground analysis imaged a different
selection of the data and found a convincing 8.5 sigma excess at
(RA, Dec) = 331.765, -27.819 {22h 07m 04s, -27d 49' 09s} (J2000)

The light curve shows a weak burst, ~1500 cts/sec (15-350 keV) 1 sec
after the trigger. T90 is ~4 seconds.