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 11058

GRB 100805A: Swift-BAT refined analysis
2010-08-05T12:46:07Z (14 years ago)
Scott Barthelmy at NASA/GSFC <>
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), E. A. Hoversten (PSU),
C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 100805A (trigger #430957)
(Hoversten, et al., GCN Circ. 11047).  The BAT ground-calculated position is
RA, Dec = 299.846, 52.618 deg, which is 
   RA(J2000)  =  19h 59m 23.0s 
   Dec(J2000) = +52d 37' 05.8" 
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 39%.
The mask-weighted light curve shows a few overlapping weak peaks
starting at ~T-1 sec, peaking at ~T+2 sec, and ending at ~T+20 sec.
There is a possible 3-sigma peak at ~T+60 sec.  T90 (15-350 keV) is
15.0 +- 3.0 sec (estimated error including systematics).
The time-averaged spectrum from T-1.4 to T+17.1 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.76 +- 0.23.  The fluence in the 15-150 keV band is 5.1 +- 0.8 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+1.97 sec in the 15-150 keV band
is 0.7 +- 0.2 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