GCN Circular 10381
Subject
GRB 100206A: Fermi GBM observation
Date
2010-02-06T19:02:46Z (14 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 13:30:05.39 UT on 06 February 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100206A (trigger 287155807 / 100206563) which
was also detected by the SWIFT-BAT (Krimm et al. 2008, GCN 10376).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 44.7 degrees.
The Fermi Observatory executed a maneuver following this trigger
and tracked the burst location for the next 5 hours,
subject to Earth-angle constraints.
The GBM light curve shows a single bright peak
with a duration (T90) of about 0.13 +/- 0.05 s (8-1000 keV).
The time-averaged spectrum from T0-0.019 s to T0+0.109 s is
best fit by a power law function with an exponential
high energy cutoff. The power law index is -0.18 (+/-0.13) and
the cutoff energy, parameterized as Epeak, is 506 (+68/-53) keV
(Castor C statistic of 569 for 479 d.o.f.)
The event fluence (8-1000 keV) in this time interval is
(9.3 +/- 0.4)E-07 erg/cm^2. The 0.016-sec peak photon flux measured
starting from T0-0.003 s in the 8-1000 keV band
is 31 +/- 2 ph/s/cm^2.
A Band function fits the spectrum equally well (Castor C statistic
of 565 for 478 d.o.f.) with Epeak= 439 (+73/-60) keV,
alpha = -0.09 (+0.17/-0.15)and beta = -2.35 (+0.24/-0.43) .
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."