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TITLE: GCN CIRCULAR
SUBJECT: GRB 120624A: Fermi GBM observation
DATE: 12/06/25 14:24:49 GMT
FROM: Andreas von Kienlin at MPE <email@example.com>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 07:24:25.34 UT on 24 June 2012, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 120624A (trigger 362215467 / 120624309).
The burst was also detected by the 3rd Interplanetary Network (Golenetskii
2011, GCN 13376). The angle from the Fermi LAT boresight is 90.2 degrees.
The GBM light curve consists of a single FRED-like pulse
with a duration (T90) of about 0.7 s (50-300 keV).
The time-averaged spectrum from T0-0.064 s to T0+0.448 s is
well fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.83 (+0.02/-0.02) and
the cutoff energy, parameterized as Epeak, is 3800 (+200/-180) keV.
The event fluence (10-1000 keV) in this time interval is
(6.5 +/- 0.1)E-06 erg/cm^2. The 0.064-sec peak photon flux measured
starting from T0+0.064 s in the 10-1000 keV band
is 78.245 +/- 2.4 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak = 3700 (+200/-220)
alpha = -0.83 (+0.02/-0.02) and beta = -3.4 (+0.4/-0.8).
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
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