GCN Circular 10864
Subject
GRB 100619A: Swift-BAT refined analysis
Date
2010-06-19T10:12:10Z (14 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. K. Cannizzo (NASA/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD),
D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 100619A (trigger #424998)
(Cannizzo, et al., GCN Circ. 10863). The BAT ground-calculated position is
RA, Dec = 84.618, -27.012 deg which is
RA(J2000) = 05h 38m 28.3s
Dec(J2000) = -27d 00' 42.2"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 75%.
The mask-weighted light curve shows two well separated peaks. The first
s compsed of several overlapping pulses which starts at ~T-3 sec, peaks at
~T_10 sec, and returns to background at ~T+20 sec. The second peak starts
~T+55 sec, peaks at ~T=85 sec, and ends at ~T+120 sec. T90 (15-350 keV)
is 97.5 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-2.9 to T+105.7 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.83 +- 0.06. The fluence in the 15-150 keV band is 4.5 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+87.22 sec in the 15-150 keV band
is 4.8 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/424998/BA/