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
The results of the batgrbproduct analysis are available at