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GCN Circular 5289

Subject
GRB 060707: Refined analysis of the Swift-BAT burst
Date
2006-07-08T03:32:39Z (18 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
M. Stamatikos (GSFC/ORAU), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the data set from T-120 to T+182 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 060707 (trigger #217704)
(Moretti, et al., GCN 5285).  The BAT ground-calculated position is RA,Dec =
357.073, -17.908 deg {23h 48m 17.4s, -17d 54' 27.4"} (J2000) +- 1.5 arcmin,
(radius, sys+stat, 90% containment).  The partial coding was 43%.
 
The mask-tagged lightcurve consists of two peaks.  The first starts at T-50 sec,
peaks at ~T-40 and then returns to a minumum at T-18 sec where it start to rise
for the beginning of the second peak.  The second peaks at ~T+5sec and ends
at ~T+40 sec.  There is no apparent further emission out to T+1400 sec.
T90 (15-350 keV) is 68 +- 5 sec (estimated error including systematics).
 
The time-averaged spectrum from T-50 to T+25 is best fit by a power law
with an exponential cutoff.  This fit gives a photon index 0.66 +- 0.63, 
and Epeak of 66 (-10/+25) keV (chi squared 64.0 for 56 d.o.f.).  
For this model the total fluence in the 15-150 keV band is
1.7 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+3.05 sec
in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/sec.  A fit to a simple power law
gives a photon index of 1.68 +- 0.13 (chi squared 73.4 for 57 d.o.f.).
All the quoted errors are at the 90% confidence level.
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