GCN Circular 11624
Subject
GRB 110201A: Swift-BAT refined analysis
Date
2011-02-01T15:17:14Z (14 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. H. Siegel (PSU),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+878 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 110201A (trigger #444230)
(Siegel, et al., GCN Circ. 11622). The BAT ground-calculated position is
RA, Dec = 137.489, 88.610 deg, which is
RA(J2000) = 09h 09m 57.3s
Dec(J2000) = +88d 36' 36.9"
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 97%.
The mask-weighted light curve shows 3 or 4 overlapping peaks starting
at ~T-2 sec, peaking at ~T_zero, and ending at ~T+30 sec.
T90 (15-350 keV) is 13.0 +- 2.2 sec (estimated error including systematics).
The time-averaged spectrum from T-2.8 to T+13.3 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.09 +- 0.11. The fluence in the 15-150 keV band is 7.0 +- 0.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.28 sec in the 15-150 keV band
is 1.1 +- 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/444230/BA/