Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 6551

GRB 070616, Swift-BAT further refined analysis
2007-06-17T16:53:05Z (17 years ago)
Scott Barthelmy at NASA/GSFC <>
G. Sato (GSFC/ISAS) and S. Barthelmy (GSFC)
on behalf of the Swift-BAT team:

The time-averaged spectrum from T-2.6 to T+602.2 sec is best fit
by a simple power-law model.  The power law index of the time-averaged
spectrum is 1.61 +- 0.04.  The fluence in the 15-150 keV band is
1.92 +- 0.03 x 10^-5 erg/cm2.  The 1-sec peak photon flux measured
from T+139.74 sec in the 15-150 keV band is 1.9 +- 0.1 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
The mask-weighted light curve shows many peaks.  The burst started with 
a low-level smooth emission at ~T-55 sec continuing smoothly and increasing
slowly until ~T+100 sec when the main emission started.  The main peak is
at T+120 sec.  Smaller overlapping peaks continue out past T+550 sec.
In particular, there is a small peak from T+730 to T+850 sec which is coincident
with a peak (flare) in the XRT lightcurve (Fig 2, GCN Report 66.1,
Starling et al.).  T90 (15-350 keV) is 402 +- 10 sec (estimated error
including systematics).
Looking for U.S. government information and services? Visit