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GCN Circular 16363

GRB 140606B: Fermi GBM detection
2014-06-07T16:05:57Z (10 years ago)
Eric Burns at U of Alabama <>
E. Burns (UAH) reporting on behalf of the Fermi GBM Team:

"At 03:11:51.86 UT on 06 June 2014, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 140606B (trigger 423717114 / 140606133).

The on-ground calculated location, using the GBM trigger
data, is RA = 327.9, DEC = +33.7 (J2000 degrees,
equivalent to 21 h 51 m, 33 d 41 '), with an uncertainty
of 1.00 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).

The angle from the Fermi LAT boresight is 66 degrees.

The optical afterglow candidates reported by iPTF (Singer et al.
GCN 16360) lie within the 1-sigma (statistical and systematic)
uncertainty regions surrounding the GBM localization.

The GBM light curve shows one long peak with a
noisy tail with a duration (T90) of about 23.6 s (50-300 keV).
The time-averaged spectrum from T0-3.0 s to T0+12.3 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -1.22 +/- 0.04 and
the cutoff energy, parameterized as Epeak, is 473.00 +/- 82.60 keV

The event fluence (10-1000 keV) in this time interval is
(9.018 +/- 0.369)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.58 s in the 10-1000 keV band is
13.31 +/- 0.37 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
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