NASA Swift: GRB 060505: Swift-BAT detection of a weak burst

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@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.