GCN Circular 3828
Subject
GRB 050819 Swift-BAT refined analysis
Date
2005-08-19T20:09:55Z (19 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
S. Barthelmy (GSFC), L. Barbier (GSFC), J. Cummings (GSFC/NRC),
D. Hullinger (GSFC/UMD), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), F. Marshall (GSFC),
A. Smale (NASA HQ), 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 full data set from the recent telemetry downlink, we report
further analysis of Swift-BAT GRB 050819 (trigger #151131)
(De Pasquale, et al., GCN 3826). The ground-analysis position is
RA,Dec 358.757, +24.874 (J2000) with an uncertainty of 2 arcmin
(radius, 90%, stat+sys). This is 50 arcseconds from the XRT ground-
calculated position reported by Kennea et al. in GCN Circ. 3827.
The light curve shows a long weak peak with indistinct structure from
T-12 to T+37 seconds. T90 is 36 +/- 4 sec. Fitting a simple power
law over the interval from T-2 to T+34 sec, the photon index is
2.6 +/- 0.3 with a fluence of 4.2 +/- 0.8 x 10^-7 erg/cm^2 in the
15-350 keV band (90% c.l.). The peak flux in a 1-sec wide window
starting at T+9.5 seconds is 0.46 +/- 0.14 ph/cm^2/sec (15-350 keV).