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 8886

GRB 090205: Swift-BAT refined analysis
2009-02-06T03:30:35Z (15 years ago)
Scott Barthelmy at NASA/GSFC <>
GRB 090205: Swift-BAT refined analysis
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), M. Perri (ASDC),
T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+455 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 090205 (trigger #342121)
(Perri, et al., GCN Circ. 8884).  The BAT ground-calculated position is
RA, Dec = 220.917, -27.848 deg which is 
   RA(J2000)  =  14h 43m 40.0s 
   Dec(J2000) = -27d 50' 51.4" 
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a single peak starting at ~T-5 sec,
peaking at ~T+3 sec, and returning to background at ~T+100 sec.
T90 (15-350 keV) is 8.8 +- 1.8 sec (estimated error including systematics).
The time-averaged spectrum from T-2.9 to T+6.6 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.15 +- 0.23.  The fluence in the 15-150 keV band is 1.9 +- 0.3 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+4.09 sec in the 15-150 keV band
is 0.5 +- 0.1 ph/cm2/sec.  All the quoted errors are at the 90% confidence
The results of the batgrbproduct analysis are available at
Looking for U.S. government information and services? Visit