GCN Circular 7899
Subject
GRB 080623, Swift-BAT refined analysis
Date
2008-06-23T17:35:06Z (16 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
W. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL),
T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+1390 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 080623 (trigger #315080)
(Ukwatta, et al., GCN Circ. 7894). The BAT ground-calculated position is
RA, Dec = 237.667, -62.044 deg which is
RA(J2000) = 15h 50m 40.1s
Dec(J2000) = -62d 02' 36.7"
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 33%.
The mask-weighted light curve shows four overlapping peaks starting
at ~T-1 sec and ending at ~T+18 sec. T90 (15-350 keV) is 15.2 +- 5 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.7 to T+16.0 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.35 +- 0.15. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+7.23 sec in the 15-150 keV band
is 2.0 +- 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/315080/BA/