//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8291 SUBJECT: GRB 080925: Fermi GBM Detection DATE: 08/09/27 05:56:47 GMT FROM: Alexander van der Horst at NASA/MSFC Adam Goldstein (UAH), Alexander van der Horst (NASA/ORAU) and Rob Preece (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 18:35:55 UT on 25 September 2008, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located the bright GRB 080925 (trigger 244060556 / 080925.775). The on-ground calculated location, using the GBM trigger data, is RA = 96.1, Dec = +18.2 (J2000 degrees, equivalent to 6h 24m, +18d 12'), with a statistical uncertainty less than 1 degree (radius, 1-sigma containment) and an additional systematic error which is currently estimated to be 2 to 3 degrees. The angle from the Fermi Large Area Telescope (LAT) boresight is 38 degrees. This GRB has several peaks, with T90 (50-300 keV) = 29 s and T50 (50-300 keV) = 9 s. The time-averaged spectrum (8 keV-1 MeV) from T0 to T0+16.6 s is best fit by a Band function with Epeak = 120 +/- 5 keV, alpha = -0.53 +/- 0.05, and beta = -2.26 +/- 0.08. The fluence (50-300 keV) is 9.7E-6 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: 8309 SUBJECT: GRB 080925: Suzaku WAM observation of the prompt emission DATE: 08/10/03 01:10:38 GMT FROM: Kazutaka Yamaoka at Aoyama Gakuin U T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Sugita, K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), Y.E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori (Univ. of Miyazaki), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report: The long GRB080925 (Fermi-GBM triggered ; Goldstein et al., GCN 8291) triggered the the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 18:35:56.853 UT (=T0). The observed light curve shows a multi-peaked structure (peaks at T0+1s, T0+5s, and T0+14s) with a duration (T90) of about 15 seconds. The fluence in 100 - 1000 keV was 7.3(+0.3, -0.2) X 10^-6 erg/cm^2. The 1-s peak flux measured from T0+5s was 2.8 photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-10s to T0+20s is well fitted by a single power-law with a photon index of 2.33(+0.16/-0.18) (chi^2/d.o.f = 36.0/42) in the 150-1000 keV energy band. All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves for this burst are availabel at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trg/grb_table.html