GCN Circular 4961
Subject
GRB 060413: Refined analysis of the Swift-BAT burst
Date
2006-04-14T00:48:30Z (18 years ago)
From
Louis M Barbier at NASA/GSFC/Swift <lmb@cosmicra.gsfc.nasa.gov>
L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), C. Pagani (PSU),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),
G. Sato (ISAS), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-239 to T+510 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 060413 (trigger #205096)
(Pagani, et al., GCN 4957). The BAT ground-calculated position is RA,Dec =
291.288,+13.746 deg {19h 25m 9.2s,+13d 44' 45.5"} (J2000) +- 1.9 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted lightcurve shows a slow rise starting at ~T+20
to a cusp-like double peak, then followed by a slow decay
ending at ~T+220 sec. T90 (15-350 keV) is 150 +- 10 sec
(estimated error including systematics).
The time-averaged spectrum from T+29.6 to T+257.1 is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 1.67 +- 0.08. The fluence in the 15-150 keV band is
3.6 +- 0.1 x 10-06 erg/cm2. The 1-sec peak photon flux measured
from T+90.16 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.