[vsnet-grb-info 1736] GRB 050712: Swift-BAT Refined Analysis

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3576
SUBJECT: GRB 050712:  Swift-BAT Refined Analysis
DATE:    05/07/12 20:18:09 GMT
FROM:    Craig Markwardt at NASA/GSFC/UMD  <craigm at milkyway.gsfc.nasa.gov>

C. Markwardt (NASA GSFC/UMD), M. Ajello (MPE), S. Barthelmy,
L. Barbier (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL),
R. Fink, N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
H. Krimm (GSFC/USRA), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), 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 GRB050712 (Trigger #145881; Grupe et al., GCN
Circ 3573) yields a refined position of RA, Dec 77.698, +64.931 {05h
10m 48s, +64d 55' 52"} (J2000) with an uncertainty of 3 arcmin
(radius, 90% confidence, statistical+systematic).

The burst duration (T90) was determined to be 48 +/- 2 seconds (15-350
keV) starting at T-7.8 seconds.  The spectrum over the interval from
T-11 to T+44 seconds can be fit with a power law with photon index
1.56 +/- 0.18 and yields a fluence of 1.8 X10^-6 erg/cm^2 in the
15-350 keV band.  The peak flux in a 1-sec wide window starting at
T+17.4 seconds is 0.6 +/- 0.2 ph/cm^2/sec.  The light curve is a long
smooth "bump" with weak, if any, structure.