[vsnet-grb-info 6333] GRB 080707, Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7952
SUBJECT: GRB 080707, Swift-BAT refined analysis
DATE:    08/07/07 22:50:07 GMT
FROM:    Hans Krimm at NASA-GSFC  <hans.a.krimm at nasa.gov>

G. Sato (ISAS), 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),
P. Schady (MSSL-UCL) M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),
T. Ukwatta (GWU) (i.e. the Swift-BAT team):

Using the data set from T-240 to T+480 sec from the recent telemetry 
downlink, we report further analysis of BAT GRB 080707 (trigger #316204) 
(Schady et al., GCN Circ. 7947).  The BAT ground-calculated position is
RA, Dec = 32.627, 33.100 deg which is
    RA(J2000)  =  02h 10m 30.5s
    Dec(J2000) = +33d 06' 01.1"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 93%.

The mask-weighted light curve consists of two main peaks of roughly 
equivalent peak flux, the first a boxcar shape from T-2 to T+4 sec, and 
the second a FRED beginning at T+23 sec and decaying to background by 
T+32 sec. T90 (15-350 keV) is 27.1 +- 1.1 sec sec (estimated error 
including systematics).

The time-averaged spectrum from T-1.8 to T+26.6 sec is best fit by a 
simple power-law model.  The power law index of the time-averaged 
spectrum is 1.77 +- 0.19.  The fluence in the 15-150 keV band is
5.2 +- 0.6 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from 
T+0.22 sec in the 15-150 keV band is 1.0 +- 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/316204/BA/