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GCN Circular 17353

GRB 150126A: Fermi GBM Detection
2015-01-27T06:15:49Z (9 years ago)
Matthew Stanbro at UAH/Fermi <>
Matthew Stanbro (UAH) reports on behalf of the Fermi GBM Team:

"At 20:50:35.78 UT on 26 January 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 150126A (trigger 443998238 / 15012686)
which MAXI detected an afterglow candidate (Takagi et al. 2015, GCN 17352).
The GBM on-ground location is consistent with MAXI position.

The angle from the Fermi LAT boresight is 92 degrees.

The GBM light curve consists of 2 main episodes
with a duration (T90) of about 97 s (50-300 keV).
The time-averaged spectrum from T0-2.05 s to T0+91.14 s is
best fit by a Band function with Epeak = 217 +/- 17 keV,
alpha = -1.07 +/- 0.04, and beta = -2.45 +/- 0.22

The event fluence (10-1000 keV) in this time interval is
(2.55 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+71.3 s in the 10-1000 keV band
is 9.71 +/- 0.36 ph/s/cm^2.

A power law function with an exponential high-energy cutoff fits
the spectrum equally well. The power law index is -1.11 +/- 0.03 and
the cutoff energy, parameterized as Epeak, is 240 +/- 13 keV.

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