Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 4289

GRB 051117A: Refined analysis of the Swift-BAT burst
2005-11-17T21:52:20Z (19 years ago)
Scott Barthelmy at NASA/GSFC <>
D. Palmer (LANL), L. Barbier (GSFC), S. Barthelmy (GSFC),
L. Cominsky (Sonoma State U.), J. Cannizzo (GSFC-UMBC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), 
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the full data set from the recent telemetry downlink,
we report further analysis of Swift-BAT GRB 051117A (trigger #164268)
(Band, et al., GCN 4280).  The ground-analysis position is
RA,Dec 228.399,+30.870 {15h 13m 35.7s,+30d 51' 10.3"} (J2000)
with an uncertainty of 1.0 arcmin (radius, 90%, stat+sys).
T90 is at least 140 +- 10 sec.  The partial coding fraction is 72%.
The lightcurve has a long FRED-like peak at T-15 sec
lasting out to at least T+190 sec.  There is a hint of emission 
peaks at T+225 and T+350 (each ~30 sec in duration).
Fitting a simple power law over the interval from T-29 to T+157 sec,
the photon index is 1.83 +/- 0.07 with a fluence of at least
4.6 +/- 0.16 X 10^-6 erg/cm^2.  The peak flux in a 1-sec wide window
starting at T+2.47 sec is 0.93 +/- 0.17 ph/cm^2/sec.  All values are
in the 15-150 keV band at the 90% confidence level.
Looking for U.S. government information and services? Visit