GCN Circular 11454
Subject
GRB 101213A: Fermi GBM observation
Date
2010-12-14T10:01:12Z (13 years ago)
From
David Gruber at MPE <dgruber@mpe.mpg.de>
David Gruber (MPE) reports on behalf of the Fermi GBM Team:
"At 10:49:20.80 UT on 13 December 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 101213A (trigger 313930162 / 101213451)
which was also detected by the Swift/BAT
(Sakamoto et al. 2010, GCN 11448).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 129 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve conists of two overlapping FRED like pulses
with a duration (T90) of about 45 (+/-4) s (50-300 keV).
The time-averaged spectrum from T0-1.536 s to T0+44.545 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.09 (+/-0.07) and
the cutoff energy, parameterized as Epeak, is 315.0 (+46.7/-35.9) keV
(CSTAT 740 for 365 d.o.f.).
The event fluence (10-1000 keV) in this time interval is
(1.40 +/- 0.01)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.944 s in the 10-1000 keV band
is 4.67 (+/-0.32) ph/s/cm^2.
A Band function fits the spectrum equally well (CSTAT 739 for 365 d.o.f.)
with Epeak= 309.7 (+48.9/-40.0) keV, alpha = -1.1 (+/-0.07)
and beta = -2.35 (+0.29/-0.72).
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."