GCN Circular 12211
Subject
AXP 4U 0142+61: Swift-BAT refined analysis
Date
2011-07-29T20:46:05Z (14 years ago)
From
Takanori Sakamoto at NASA/GSFC <takanori@milkyway.gsfc.nasa.gov>
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU),
J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-120 to T+180 sec, we report further analysis
of AXP 4U 0142+61 (trigger #458345) (Oates, et al., GCN Circ. 12209).
The mask-weighted light curve in 8 msec binning shows at least 10 short
bursts in the available data. The burst times are, T-12.368 sec, T+0 sec
(triggered burst), T+1.336 sec, T+23.528 sec, T+61.632 sec, T+84.784 sec,
T+137.688 sec, T+157.224 sec, T+162.432 sec and T+162.856 sec where
T = 11:19:15.398 UT. The triggered burst at T+0 sec has the brightest pulse.
T90 (15-350 keV) of this brightest burst is 5 +- 1 msec (estimated error
including systematics).
The time-averaged spectrum of this brightest burst from T+0.001 sec to
T+0.006 sec is best fit by a blackbody model. The blackbody temperature
is 6.7 +- 1.0 keV (chi square 55.9 for 57 d.o.f.). The fluence in
the 15-150 keV band is 1.2 +- 0.4 x 10^-7 erg/cm2. 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/458345/BA/