[vsnet-grb-info 3587] GRB 060807: Refined analysis of the Swift-BAT burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5421
SUBJECT: GRB 060807:  Refined analysis of the Swift-BAT burst
DATE:    06/08/07 23:08:18 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

S.D. Barthelmy (GSFC), L. Barbier (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), M. De Pasquale (UCL-MSSL),
T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the data set from T-120 to T+302 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 060807 (trigger #223217)
(De Pasquale, et al., GCN Circ. 5409).  The BAT ground-calculated position
is (RA,Dec) = 252.505, 31.597 deg {16h 50m 1.3s, 31d 35' 48.0"} (J2000)
+- 1.7 arcmin, (radius, sys+stat, 90% containment).  The partial coding was 69%.
 
The mask-weighted lightcurve shows a roughly triangular shaped peak
starting at T-50, peaking at T+0, and ending at T+30 sec.
T90 (15-350 keV) is 34 +- 4 sec (estimated error including systematics).
 
The time-averaged spectrum from T-16.5 to T+24.7 is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum
is 1.57 +- 0.20.  The fluence in the 15-150 keV band is
7.3 +- 0.9 x 10^-7 erg/cm2.  The 1-sec peak photon flux measured
from T-0.14 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.