TITLE: GCN CIRCULAR NUMBER: 8686 SUBJECT: GRB 081217: Fermi GBM detection DATE: 08/12/19 22:33:44 GMT FROM: Colleen A. Wilson at NASA/MSFC/NSSTC Colleen A. Wilson-Hodge (NASA/MSFC) reports on behalf of the Fermi GBM Team: "At 23:34:49.01 UT on 17 December 2008, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 081217 (trigger 251249690 / 081217983). The on-ground calculated location, using the GBM trigger data, is RA = 116.7, DEC = +26.7 (J2000 degrees, equivalent to 07 h 47 m, 26 d 44'), with an uncertainty of 2.0 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 54 degrees. The GBM light curve consists of a broad structured peak with a duration (T90) of about 39 s (8-1000 keV). The time-averaged spectrum from T0 to T0+18.432 s is adequately fit by a Band function with Epeak = 167 +/- 11 keV, alpha = -0.61 +/- 0.09, and beta = -2.7 +/- 0.6. The event fluence (8-1000 keV) in this time interval is (1.0 +/- 0.07)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0 in the 8-1000 keV band is 4.0 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."