GCN Circular 8007
Subject
GRB 080723, Swift-BAT refined analysis
Date
2008-07-23T18:48:45Z (16 years ago)
From
Hans Krimm at NASA-GSFC <hans.a.krimm@nasa.gov>
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. Baumgartner
(GSFC/UMBC),
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), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 080723 (trigger #317662)
(Stamatikos, et al., GCN Circ. 8000). The BAT ground-calculated position is
RA, Dec = 274.461, -6.910 deg which is
RA(J2000) = 18h 17m 50.6s
Dec(J2000) = -06d 54' 34.8"
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).
The burst was in the fully coded part of the BAT field of view.
The mask-weighted light curve showed a double-peaked structure, with the
first peak extending from T-1 sec to T+4 sec, and the second smaller
peak from T+6 sec to T+20 sec. T90 (15-350 keV) is 17.3 +- 3.0 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.2 to T+18.7 sec is best fit by a
simple power-law model. The power law index of the time-averaged
spectrum is 1.77 +- 0.21. The fluence in the 15-150 keV band is
3.3 +- 0.4 x 10-7 erg/cm2. The 1-sec peak photon flux measured from
T-0.13 sec in the 15-150 keV band is 0.9 +- 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/317662/BA/