[vsnet-grb-info 1775] GRB050714B: Refined analysis of the Swift-BAT burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3615
SUBJECT: GRB050714B:  Refined analysis of the Swift-BAT burst
DATE:    05/07/15 02:40:16 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott at lheamail.gsfc.nasa.gov>

J. Tueller (GSFC), S. Barthelmy, L. Barbier (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
H. Krimm (GSFC/USRA), C. Markwardt (NASA GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),
on behalf of the Swift-BAT team:

Using the full data set from the recent telemetry downlink, we report
further analysis of Swift-BAT Trigger #145994 (Levan, et al., GCN 3613).
The ground-analysis position is RA,Dec 169.697,-15.535 (J2000).
The event-by-event data yields a lightcurve with a broad bump
starting at T+15 sec and ending at T+70 sec.
The spectrum over the interval from T-19 to T+68 seconds is soft.
The simple power law photon index is 2.6 +/- 0.3 with a fluence
of 6.5 +/- 1.4 X 10^-7 erg/cm^2 in the 15-350 keV band (90% c.l.).
The peak flux in a 1-sec wide window starting at T+55 seconds
is 0.5 +/- 0.2 ph/cm^2/sec.
Although we can not rule out a hard x-ray transient source,
it is more likely a real GRB, albeit on the soft end of the distribution.