GCN Circular 14164
Subject
GRB 130131B: Swift-BAT refined analysis
Date
2013-01-31T23:16:16Z (12 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
T. Sakamoto (AGU), 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), A. Lien (GSFC/ORAU), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), G. Sato (ISAS), M. H. Siegel (PSU),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-119 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130131B (trigger #547420)
(Siegel, et al., GCN Circ. 14159). The BAT ground-calculated position is
RA, Dec = 173.957, 15.033 deg which is
RA(J2000) = 11h 35m 49.6s
Dec(J2000) = +15d 01' 59.3"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 51%.
The mask-weighted light curve shows a single pulse starting at ~T-1 sec,
peaking at ~T+0.5 sec, and ending at ~T+10 sec. T90 (15-350 keV) is
4.30 +- 0.26 sec (estimated error including systematics).
The time-averaged spectrum from T-0.28 to T+4.37 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.15 +- 0.20. The fluence in the 15-150 keV band is 3.4 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.28 sec in the 15-150 keV band
is 1.0 +- 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/547420/BA/