Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 8213

GRB 080905C: Fermi GBM detection
2008-09-11T15:08:30Z (16 years ago)
Elisabetta Bissaldi at MPE <>
E. Bissaldi, S. McBreen and A. von Kienlin (MPE) 
report on behalf of the Fermi GBM Team: 

"At 13:41:29 UT on 5 September 2008, the Fermi Gamma-ray Burst Monitor  
triggered and located GRB 080905C (trigger 242314890 / 080905570).
The on-ground calculated location, using the Fermi GBM trigger 
data, is RA = 96.9, Dec = -69.8 (J2000 degrees) 
(equivalent to J2000 06h 28m, -69d 48'), 
with a statistical uncertainty of 8 degrees (radius, 1-sigma
containment; there is additionally a systematic error which is 
currently estimated to be 2 to 3 degrees). The angle from the 
Fermi LAT boresight is 108 degrees. 

This event comprises three pulses beginning at T0-4 s. 
The main emission occurs during the first 11 sec and T90 (50-300 keV)
is about 28 s. The time-averaged spectrum from T0-3.6 s to T0+17 s
is adequately fit by a power law function with an exponential
high energy cutoff. The power law index is -0.90 +/-0.17 and
the cutoff energy, parameterized as Epeak, is 78.8 +/- 5.9 keV.

The fluence (25-1000 keV) is 4.6 (+/-0.3)E-06  erg/cm2
and the peak flux (25-1000 keV) on the 128 ms timescale 
is 4.4 +/- 1.9 ph/cm2/s.

The spectral analysis results presented above are preliminary; 
the final results will be published in the Fermi GBM GRB Catalog."
Looking for U.S. government information and services? Visit