GCN Circular 6869
Subject
GRB 071008, Swift-BAT refined analysis
Date
2007-10-10T15:47:08Z (17 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
E. Fenimore (LANL), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
A. Moretti (INAF-OAB), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
G. Sato (GSFC/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+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 071008 (trigger #293587)
(Moretti, et al., GCN Circ. 6856). The BAT ground-calculated position is
RA, Dec = 151.571, 44.303 deg which is
RA(J2000) = 10h 6m 17.0s
Dec(J2000) = 44d 18' 13"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 88%.
The mask-weighted light curve shows a symmetrical peak starting at ~T-11 sec,
peaking at ~ T-1 sec, and ending at ~T+10 sec.
T90 (15-350 keV) is 18 +- 1 sec (estimated error including systematics).
The time-averaged spectrum from T-11.0 to T+14.0 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.23 +- 0.27. The fluence in the 15-150 keV band is 2.4 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-2.04 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.