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 4020

GRB 050922C: Swift-BAT refined analysis
2005-09-23T00:37:09Z (19 years ago)
Takanori Sakamoto at NASA/GSFC <>
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), 
J. Cannizzo (GSFC-UMBC), L. Cominsky (Sonoma State U.), 
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), 
D. Hullinger (UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), 
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), 
J. Tueller (GSFC) on behalf of the Swift-BAT team:

Using the data set from T-10 to T+60 sec from the recent telemetry
downlink, we report further analysis of Swift-BAT GRB 050922C 
(trigger #156467)  (Norris, et al., GCN 4013).  The refined BAT ground position
is (RA,Dec) = 317.381, -8.762 {21:09:32, -8:45:43} [deg; J2000]
+- 1.0 arcmin, (radius, sys+stat, 90% containment).  The partial coding 
was 53%.  

The light curve shows the intense broad peak starting from T-3 to T+3 with 
at least two sub-peaks on top.  T90 (15-350 keV) is (5 +- 1) sec 
(estimated error including systematics).  

The power law index of the time-averaged spectrum is 1.33 +- 0.06.  
The fluence in the 15-150 keV band is (1.7 +- 0.1) x 10^-6 erg/cm2.  
The 1-sec peak photon flux measured from T-0.02 sec in the 15-150 keV 
band is (7.5 +- 0.3) ph/cm2/sec.  All the quoted errors are at the 90% 
confidence level.
Looking for U.S. government information and services? Visit