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GCN Circular 16889

GRB 141005A: Fermi GBM Detection
2014-10-05T15:32:52Z (10 years ago)
Oliver Roberts at UCD/Fermi <>
O. Roberts (UCD) reports on behalf of the Fermi GBM Team:

"At 05:13:06.97 UT on the 5th of October 2014, the Fermi
Gamma-Ray Burst Monitor triggered and located GRB 141005A
(trigger 434178789 / 141005217) which was also detected by
Swift (V. D'Elia et al. 2014, GCN 16682). The GBM on-ground
location is consistent with the Swift position.

The angle from the Fermi LAT boresight is 107 degrees.

The GBM light curve shows a single pulse with a duration (T90)
of about 3 seconds (50-300 keV). The time-averaged spectrum
from T0-0.26 s to T0+3.07 s is best fit by a power law
function with an exponential high-energy cutoff. The power law
index is -0.30 +/- 0.11  and the cutoff energy, parameterised
as Epeak, is 138 +/- 8 keV.

A Band function fits the spectrum equally well with
Epeak= 119 +/- 10 keV, alpha = -0.06 +/- 0.2 and
beta = -2.7 +/- 0.3.

The event fluence (10-1000 keV) in this time interval is
2.6 E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+1.5 seconds in the 10-1000 keV band
is 3.7 +/- 0.2 ph/s/cm^2.

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

Dr. Oliver J. Roberts BSc PhD
Space Science and Advanced Materials Research Group,
School of Physics,
University College Dublin,
Dublin 4,
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