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Burst U11549 summary
- Trigger time is
- UTC=20040709_005807
- GRB=GRB040709+3487
- Triggering instrument was unknown
- Trigger timescale was 9999.0 seconds
- Trigger detected in unknown keV band
Evaluation GRB040709
Big GRB, untriggered because star cameras were off
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Download ASCII table of Fregate Band A, B, C lightcurves
here.
The color of trigger U11549, defined by the ratio of
total counts in Fregate band C (30-400 keV) to band A (7-40 keV)
vs. band B (7-80 keV) to band A, overlaid on a the color-color
plot of all localized bursts detected to date. Note the separation
of XRFs, XRRs, and GRBs.
The signal to noise in Fregate band C (30-400 keV)
of trigger U11549 in relation to the S/N of band C
of other localized HETE triggers. We find empirically that
most XRFs are faint and soft: the fact that localized bursts
require a minimum S/N in the 2-25 keV band means that the
band C S/N should be low. We find a cutoff in the band
C S/N of 6.5 delineates the XRF/non-XRF population with
high reliability.
Link to
Jochen Greiner's web page on
Skymap for HETE trigger U11549