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GCN Circular 11347

Subject

GRB 101017A: Swift-BAT refined analysis

Date

2010-10-17T16:32:05Z (14 years ago)

From

Craig Markwardt at NASA/GSFC/UMD <craigm@milkyway.gsfc.nasa.gov>

D. M. Palmer (LANL), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), M. H. Siegel (PSU), M. Stamatikos (OSU),
J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):

Using the data set from T-60 to T+240 sec from the recent telemetry 
downlink, we report further analysis of BAT GRB 101017A (trigger 
#436429) (Siegel, et al., GCN Circ. 11345Not found
 
 
).  The BAT ground-calculated 
position is RA, Dec = 291.377, -35.141 deg which is
    RA(J2000)  =  19h 25m 30.5s
    Dec(J2000) = -35d 08' 25.9"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). 
The partial coding was 43%.

The mask-weighted light curve resembles an overall FRED-like profile, 
starting at T-5 sec, peaking at T+2 sec, but with multiple shorter 
spikes superimposed.  An extended tail is detectable out to at least 
T+160 sec.  T90 (15-350 keV) is 70.0 +- 3.0 sec (estimated error 
including systematics).

The time-averaged spectrum from T-5.5 to T+111 sec is best fit by a 
simple power-law model.  The power law index of the time-averaged 
spectrum is 1.45 +- 0.03.  The fluence in the 15-150 keV band is 1.8 +- 
0.1 x 10^-5 erg/cm2.  The 1-sec peak photon flux measured from T+2.58 
sec in the 15-150 keV band is 9.4 +- 0.4 ph/cm2/sec.  All the quoted 
errors are at the 90% confidence level.

The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/436429/BA/