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GCN Circular 16127

Subject
GRB 140419A: Swift-BAT refined analysis
Date
2014-04-19T15:19:34Z (10 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC),
C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+485 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 140419A (trigger #596426)
(Marshall, et al., GCN Circ. 16118).  The BAT ground-calculated position is
RA, Dec = 127.001, 46.234 deg, which is 
   RA(J2000)  =  08h 28m 00.4s 
   Dec(J2000) = +46d 14' 03.7" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 33%.
 
The mask-weighted light curve shows two slightly overlapping clusters of
peaks, starting at ~T-10 sec, peaking at ~T+10 and ~T+51 sec, and ending
at ~T+220 sec.  T90 (15-350 keV) is 94.7 +- 11.0 sec (estimated error
including systematics).
 
The time-averaged spectrum from T-8.69 to T+222.32 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.21 +- 0.04.  The fluence in the 15-150 keV band is 1.59 +- 0.03 x 10^-5 erg/cm2.
The 1-sec peak photon flux measured from T+51.42 sec in the 15-150 keV band
is 4.9 +- 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/596426/BA/

[GCN OPS NOTE(22apr14): Per author's request, the fluence value
was changed from "1.6 +- 0.0" to "1.59 +- 0.03". Acknowledgement
to F.Marshall for pointing out the missing error value.]
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