GCN Circular 8100

C.A. Meegan (NASA/MSFC), J. Greiner (MPE), N.P. Bhat (UAH), E. Bissaldi 
(MPE), M.S. Briggs (UAH), V. Connaughton (UAH), R. Diehl (MPE), G.J. 
Fishman (NASA/MSFC), L. Gibby (NASA/MSFC), A.S. Hoover (LANL), A.J. 
van der Horst (NASA/ORAU), A. von Kienlin (MPE), R.M. Kippen (LANL), C. 
Kouveliotou (NASA/MSFC), G.G. Lichti (MPE), S. McBreen (MPE), W.S. 
Paciesas (UAH), R.D. Preece (UAH), H. Steinle (MPE), M.S. Wallace
(LANL), 
and C.A. Wilson-Hodge (NASA/MSFC)report:

"At 13:10:12 UT on 10 August 2008, the GLAST Burst Monitor (GBM) 
triggered and located GRB 080810 (GBM 080810.549, trigger 240066613), 
which was also detected by Swift (Page et al., GCN 8080
Not found
 
 
). 
The on-ground calculated location, using the GBM trigger data, is
RA, Dec 357.18, -4.61 which is equivalent to
    RA(J2000) = 23h 49m
    Dec(J2000) = -4d 37'
with an uncertainty of 5.0 degrees (radius, 1-sigma containment, 
statistical only). The angle from the Large Area Telescope (LAT) 
boresight is 61 degrees.

The GBM light curve shows a slow rise starting at T0-20, followed by 
a main emission phase comprising 5 pulses, a quiescent period and a 
sixth pulse at T0+102 s. 

The time-averaged spectrum from T-0.5 to T+53.1 sec is best fit by a 
power law function with an exponential high energy cutoff. The cutoff 
energy is 313.5 +/-73.6 keV and the power law index is -0.91 +/-0.12, 
with a reduced chi-square of 1.1 for 226 degrees of freedom. 

The fluence in the 50-300 keV band is (6.9 +/- 0.5) x 10^-6 erg/cm2. 
The 1-sec photon flux measured from T+23.5 sec in the 50-300 keV band 
is 1.85 +/- 0.16 ph/cm2/sec. All the quoted errors are at the 90% 
confidence level."