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GCN Circular 19827

BAT detection and localization of GRB 160819A
2016-08-20T23:08:58Z (8 years ago)
Amy Lien at GSFC <>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC),
and A. Y. Lien (GSFC/UMBC) report on behalf of the Swift Team:

At 20:27:30.40 UT on 2016-08-19, the Swift Burst Alert Telescope (BAT)
detected GRB 160819A, which was also detected by Fermi/GBM and
INTEGRAL SPI-ACS (Veres et al., GCN Circ. 19826). BAT was slewing to
a pre-planned target at that time, so it did not trigger on the burst.

However, ground analysis using the slew data fromT+27 to T+106 sec
reveals the GRB location of RA, Dec = 114.139, -22.347 deg, which is
  RA(J2000)  =  07h 36m 33.3s
  Dec(J2000) = -22d -20' -50.2"
with an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment).
This position is 4.76 deg from the one reported by Fermi GBM, which is
consistent with the reported GBM error circle (Veres et al., GCN Circ. 19826).

The mask-weighted light curve shows a double-peaked structure that starts
before the beginning of the available event data, and ends at ~ T+70 s. The
two peaks occur at ~T+47 s and ~T+53 s, respectively.

The time-averaged spectrum from T+26.6 to T+73.6 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.70 +- 0.05.  The fluence in the 15-150 keV band is (7.76 +/- 0.23) x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+46.70 sec in the 15-150 keV band
is 12.1 +- 0.6 ph/cm2/sec.  All the quoted errors are at the 90% confidence

The results of the batgrbproduct analysis are available at
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