S. McBreen , A. von Kienlin and E. Bissaldi (MPE) report on
behalf of the Fermi GBM Team:
"At 08:42:13 UT on 23 August 2008, the Fermi GBM triggered and located
GRB 080823 (trigger 241173734 / 080823.363).
The on-ground calculated location, using the GBM trigger data, is
RA = 91.8 , Dec = -40.6 (J2000 degrees, equivalent to 06h 07m, -40d
36'), with an uncertainty of 3.3 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic error which is
currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT
boresight is 77 degrees.
This event comprises a small pulse at T0-3 sec, a main pulse with
substructure from 0 to 20 sec and a weaker pulse from 20 to 40 sec. T90
(50-300 keV) is about 46 sec. The time-averaged spectrum from T0 to
T0+18s is best fit by a power law function with an exponential high energy
cutoff. The cutoff energy, parameterized as Epeak, is 164.7+/-34.2 keV
and the power law index is -1.2 +/-0.2. The fluence (50-300 keV) over T90
is 4.1e-6 erg/cm^2.
The spectral analysis results presented above are preliminary; the final
results will be published in the GBM GRB Catalog."