GCN Circular 14296
Subject
GRB 130313A: Swift-BAT refined analysis
Date
2013-03-13T19:48:15Z (11 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), B.P. Gompertz (U Leicester),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), 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-60 to T+180 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130313A (trigger #550906)
(Gompertz, et al., GCN Circ. 14293). The BAT ground-calculated position is
RA, Dec = 236.438, -0.355 deg, which is
RA(J2000) = 15h 45m 45.1s
Dec(J2000) = -00d 21' 18.0"
with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 82%.
The mask-weighted light curve shows a single pulse starting at ~T+0.0,
peaking at ~T+0.1 sec, and ending at ~T+0.2 sec. T90 (15-350 keV) is
0.26 +- 0.09 sec (estimated error including systematics).
The time-averaged spectrum from T-0.02 to T+0.23 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.37 +- 0.36. The fluence in the 15-150 keV band is 3.1 +- 0.7 x 10^-8 erg/cm2.
The 1-sec peak photon flux measured from T-0.36 sec in the 15-150 keV band
is 0.5 +- 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/550906/BA/