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GCN Circular 14834

Subject

GRB 130609A, Swift-BAT refined analysis

Date

2013-06-09T13:43:19Z (11 years ago)

From

Jay R. Cummings at NASA/GSFC/Swift <james.r.cummings@nasa.gov>

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),
A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC),
T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
  
Using the data set from T-60 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130609A (trigger #557782)
(Cummings, et al., GCN Circ. 14828Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 152.680, 24.124 deg which is
    RA(J2000)  =  10h 10m 43.2s
    Dec(J2000) = +24d 07' 27.1"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 87%.
  
The mask-weighted light curve shows a single FRED peak.  T90 (15-350 keV) is
7.0 +- 0.8 sec (estimated error including systematics).
  
The time-averaged spectrum from T-1.19 to T+7.28 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.88 +- 0.11.  The fluence in the 15-150 keV band is 5.7 +- 0.4 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T+0.52 sec in the 15-150 keV band
is 1.8 +- 0.2 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/557782/BA/