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GCN Circular 12831

Subject
AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
Date
2012-01-13T00:33:18Z (12 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-239 to T+420 sec from recent telemetry downlinks,
we report further analysis of BAT trigger #511611 on AXP 4U 0142+61
(Barthelmy, et al., GCN Circ. 12829).  The partial coding was 84%.
 
The mask-weighted light curve shows a single FRED-like peak starting at T_0
and lasting for ~250 msec.  T90 (15-350 keV) is 0.024 +- 0.009 sec
(estimated error including systematics).
 
The time-averaged spectrum from T+0.008 to T+0.036 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.32 +- 0.50.  The fluence in the 15-150 keV band is 6.8 +- 2.1 x 10^-9 erg/cm2.
The 1-sec peak photon flux measured from T-0.48 sec in the 15-150 keV band
is 0.4 +- 0.1 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/511611/BA/
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