GCN Circular 14229
Subject
GRB 130216A: Swift-BAT refined analysis
Date
2013-02-17T13:55:37Z (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), H. A. Krimm (GSFC/USRA),
A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB),
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-240 to T+962 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130216A (trigger #548927)
(Melandri, et al., GCN Circ. 14223). The BAT ground-calculated position is
RA, Dec = 67.901, 14.670 deg, which is
RA(J2000) = 04h 31m 36.2s
Dec(J2000) = +14d 40' 10.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 54%.
The mask-weighted light curve shows two peaks. There is an initial small peak
centered on ~T-6 sec with a duration of about 4 sec. The second peak starts
at ~T-3 sec, peaks at ~T+2 sec, and ends at ~T+10 sec.
T90 (15-350 keV) is 6.5 +- 1.1 sec (estimated error including systematics).
The time-averaged spectrum from T-6.16 to T+4.31 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.35 +- 0.04. The fluence in the 15-150 keV band is 3.1 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+1.11 sec in the 15-150 keV band
is 6.5 +- 0.3 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/548927/BA/