TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3600
SUBJECT: GRB 050713B:  Swift-BAT Refined Analysis
DATE:    05/07/13 21:02:37 GMT
FROM:    Ann M. Parsons at NASA/GSFC/Swift  <parsons@milkyway.gsfc.nasa.gov>

A. Parsons (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), F. Marshall (GSFC), D. Palmer (LANL),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), A. Smale (NASA HQ),
M. Suzuki (Saitama), J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the full data set from the recent telemetry downlink, further
analysis of Swift-BAT GRB 050713B (Trigger #145754; Vaughn et al.,
GCN Circ 3590) yields a refined position of RA, Dec 307.820,
+60.938 {20h 31m 17s, +60d 56' 17"} (J2000) with an uncertainty
of 3 arcmin (radius, 90% confidence, statistical+systematic).  The
light curve shows a FRED-like profile of total duration ~75 seconds.

The spectrum over the interval from T-2 to T+178 seconds can be fit
with a power law with photon index 1.56 +/- 0.13 and yields a fluence
of 8.2 +/- 1.0 X 10^-6 erg/cm^2 in the 15-350 keV band.  The peak
flux in a 1-sec wide window starting at T+4.4 seconds is
2.2 +/- 0.6 ph/cm^2/sec.