TITLE: GCN CIRCULAR NUMBER: 8139 SUBJECT: SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts DATE: 08/08/26 22:10:21 GMT FROM: Jerry Fishman at NASA-MSFC G. J. Fishman (MSFC), S. McBreen (MPE), M. S. Briggs (UAH), C. Kouveliotou (MSFC), A. von Kienlin (MPE), A. J. van der Horst (MSFC/ORAU), P. N. Bhat (UAH), C. A. Meegan (MSFC), report for the Fermi GBM team: A recent GCN Circ. (Kouveliotou, et al., GCN 8138) summarizes observations of SGR 0501+4516,as seen with the Fermi GBM (formerly GLAST Burst Monitor). Below, we report on three exceptionally large events from this data set observed on 24 and 25 August 2008. Peak fluxes are over a time interval of 64 ms and fluences for the durations listed; both are for the energy range 20 to 200 keV. All event spectra were best fit with a power law and an exponential cutoff; their spectral parameters are also given below. These large events may have observable ionospheric disturbances associated with them. ---------------------------------------------------------------------- Date UT Fluence Peak flux Index E(peak) Duration (erg/cm2) (erg/cm2-s) (keV) (ms) 080824* 1:17:57 2.2E-5 1.6E-4 0.21 50 448 080825* 4:48:29 2.7E-6 3.6E-5 0.14 39 192 080825 9:37:44 9.9E-7 1.0E-5 0.32 38 320 * - reported by S. Golenetskii from Konus-Wind data (GCN 8132) -----------------------------------------------------------------------