GCN Circular 14279
Subject
GRB 130306A: Swift-BAT refined analysis
Date
2013-03-09T01:15:33Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
S. D. Barthelmy (GSFC), A. Lien (NASA/GSFC/ORAU). T. Sakamoto (GSFC/UMBC),
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), G. Sato (ISAS), 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-160 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130306A (trigger #550457)
(Siegel, et al., GCN Circ. 14266). The BAT ground-calculated position is
RA, Dec = 279.475, -11.682 deg, which is
RA(J2000) = 18h 37m 54.1s
Dec(J2000) = -11d 40' 55.0"
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 11%.
This burst was already active when it came into the BAT FoV during a slew
at T-160 sec. There were several peaks until ~T-130 sec, then a long
relatively smooth decay out past T+900 sec (when the data ends).
The time-averaged spectrum from T-159.5 to T+154.1 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.95 +- 0.05. The 1-sec peak photon flux (during the period of BAT viewing)
measured from T-152.73 sec in the 15-150 keV band is 7.3 +- 0.8 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/550457/BA/