GCN Circular 11805
Subject
GRB 110318A: Fermi GBM detection
Date
2011-03-18T22:15:54Z (13 years ago)
From
Gerard Fitzpatrick at UCD <gerard.fitzpatrick@ucdconnect.ie>
G. Fitzpatrick (UCD) reports on behalf of the Fermi GBM Team:�
"At 13:14:16.70 UT on 18th March 2011, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 110318 (trigger 322146858 / 110318552),�
which was also detected by the Swift/BAT (Sbarufatti et al. 2011,�
GCN 11798). The GBM on-ground location is consistent with the Swift�
position.
The angle from the Fermi LAT boresight is 70 degrees.
The GBM light curve consists of single peak
with a duration (T90) of about 12 s (50-300 keV).�
The time-averaged spectrum from T0-1 s to T0+10 s is �
fit well with �a power law function with an exponential
high-energy cutoff. �The power law index is -0.86 +/- 0.04 and
the cutoff energy, parameterized as Epeak, is 114.70 +/- 3.72 keV
A Band function fits the spectrum equally well with Epeak= 107.00 +/- 5.18
keV, alpha =-0.80 +/- 0.05, and beta = -2.74 +/- 0.25.
The event fluence (10-1000 keV) in this time interval is�
(8.05 +/- 0.15)E-6 erg/cm^2. The 1-sec peak photon flux measured�
starting from T0-1 s in the 8-1000 keV band�
is 10.97 +/- 0.29 ph/s/cm^2.
The spectral analysis results presented above are preliminary;�
final results will be published in the GBM GRB Catalog."
[GCN OPS NOTE(19mar11): Per author's request, the citation
for GCN Circ 11798 was corrected.]