//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8341 SUBJECT: GRB081006: Fermi GBM detection DATE: 08/10/08 19:09:04 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/ORAU) reports on behalf of the Fermi GBM Team: "At 14:29:34 UT on 6 October 2008, the Fermi GBM triggered and located GRB 081006 (trigger 244996175 / 081006.604). The on-ground calculated location, using the GBM trigger data, is RA = 142.4, Dec = -67.4 (J2000 degrees, equivalent to 9h 30m, -67d 24'), with an uncertainty of 4.5 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 16 degrees. This GRB is ~7 seconds long. The time-averaged spectrum (8 keV-30 MeV) from T0-3.8 to T0+3.3 s is best fit by a Band function with alpha = -0.77 +/- 0.24, beta = -1.80 +/- 0.22 and Epeak = 1135 +/- 826 keV. The value of Epeak is not well constrained, but the Band function provides a significantly better fit than a single power law or a power law with exponential cutoff. The fluence (50-300 keV) is 7.1E-7 erg/cm^2. The spectral analysis results presented above are preliminary; the final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8342 SUBJECT: GRB081006B: Fermi GBM detection DATE: 08/10/08 19:10:46 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/ORAU) reports on behalf of the Fermi GBM Team: "At 20:55:35 UT on 6 October 2008, the Fermi GBM triggered and located GRB 081006B (trigger 245019336 / 081006.872). The on-ground calculated location, using the GBM trigger data, is RA = 144.9, Dec = -57.5 (J2000 degrees, equivalent to 9h 40m, -57d 30'), with an uncertainty of 9.3 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 3 degrees. This GRB is ~9 seconds long. The time-averaged spectrum (8-1000 keV) from T0-2.6 to T0+5.6 s is best fit by a power law with index = -1.30 +/- 0.09. The fluence (50-300 keV) is 7.3E-7 erg/cm^2. The spectral analysis results presented above are preliminary; the final results will be published in the GBM GRB Catalog."