GCN Circular 6362
Subject
GRB 070429A, Swift-BAT refined analysis
Date
2007-04-29T14:04:22Z (17 years ago)
From
Louis M Barbier at NASA/GSFC/Swift <lmb@cosmicra.gsfc.nasa.gov>
J. Cannizzo (GSFC/UMBC), L. Barbier (GSFC), S. D. Barthelmy (GSFC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), 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-239.0 to T+963.1 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 070429
(trigger #277571) (Barthelmy, et al., GCN Circ. 6355). The BAT
ground-calculated position is RA, Dec = 297.695, -32.420 deg which is
RA(J2000) = 19h 50m 46.9s
Dec(J2000) = -32d 25' 12.1"
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 68%.
The masked weighted light curve shows a single somewhat broad peak,
extending out to T+50 sec, followed by several smaller peaks.
T90 (15-350 keV) is 163 +- 5sec (estimated error including systematics).
The time-averaged spectrum from T-12.4 to T+178.0 is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 2.11 +- 0.27. The fluence in the 15-150 keV band is
9.2 +- 1.4 x 10-07 erg/cm2. The 1-sec peak photon flux measured
from T+3.99 sec in the 15-150 keV band is 0.4 +- 0.2 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.