//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9130 SUBJECT: GRB 090411A: Fermi GBM detection DATE: 09/04/16 14:36:53 GMT FROM: Rob Preece at UAH Rob Preece (UAH)reports on behalf of the Fermi GBM Team: "At 20:06:36.89 UT on 4 April, 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090411 (trigger 261173198 / 090411838). The on-ground calculated location, using the GBM trigger data, is RA = 159.34, DEC = -68.36 (J2000 degrees, equivalent to 10 h 37 m, 68 d 21'), with an uncertainty of 2.3 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 59 degrees. The GBM light curve consists of two main pulses with a duration (T90) of about 24.6 s (8-1000 keV). The time-averaged spectrum from T0-2.04 s to T0+18.4 s is best fit by a Band function with Epeak = 141 +/- 35 keV, alpha = -0.88 +/- 0.15, and beta = -1.82 +/- 0.08 (chi squared 319.93 for 318 d.o.f.). The event fluence (8-1000 keV) in this time interval is (8.6 +/- 1.2)E-6 erg/cm^2. The 0.256-sec peak photon flux measured starting from T0+11.75 s in the 8-1000 keV band is 3.25 +/- 0.94 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9131 SUBJECT: GRB 090411B: Fermi GBM detection DATE: 09/04/16 14:39:32 GMT FROM: Rob Preece at UAH Rob Preece (UAH) reports on behalf of the Fermi GBM Team: "At 23:47:44.88 UT on 11 April 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090411B (trigger 261186466 / 090411991). The on-ground calculated location, using the GBM trigger data, is RA = 37.0, DEC = 3.2 (J2000 degrees, equivalent to 02 h 28 m, 3 d 15 '), with an uncertainty of 2.8 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 111 degrees. The GBM light curve consists of a single spiky outburst with a duration (T90) of about 18.7 s (8-1000 keV). The time-averaged spectrum from T0-2.56 s to T0+20.9 s is adequately fit by a Band function with Epeak = 189 +/- 37 keV, alpha = -0.8 +/- 0.1, and beta = -2.0 +/- 0.2 (chi squared 369 for 325 d.o.f.). The event fluence (8-1000 keV) in this time interval is (8.0 +/- 0.8)E-6 erg/cm^2. The 0.256-sec peak photon flux measured starting from T0+6.15 s in the 8-1000 keV band is 7.4 +/- 3.0 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9146 SUBJECT: GRB 090411A: Suzaku WAM observation of the prompt emission DATE: 09/04/18 10:01:48 GMT FROM: Masanori Ohno at ISAS/JAXA M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), W. Iwakiri, M. Tashiro, Y. Terada, A. Endo, K. Onda, T. Sugasahara (Saitama U.), Y. Urata (NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, Y. Hanabata (Hiroshima U.), E. Sonoda, M. Yamauchi, N. Ohmori, K. Kono, H. Hayashi (Univ. of Miyazaki), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), on behalf of the Suzaku WAM team, report: The long GRB 090411A (Fermi-GBM trigger #261173198 ; Preece et al., GCN 9130) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 20:06:36 UT (=T0). The observed light curve shows a double-peaked structure starting at T0-1s, ending at T0+20s (T90) of about 16 seconds. The fluence in 100 - 1000 keV was 7.0 +/-0.6 x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+12s was 2.5(-0.4,+0.3) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-1s to T0+20s is well fitted by a single power-law with a photon index of 1.9 (-0.1,+0.2) (chi^2/d.o.f = 9.2/13). 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 available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9147 SUBJECT: GRB 090411B: Suzaku WAM observation of the prompt emission DATE: 09/04/18 10:04:13 GMT FROM: Masanori Ohno at ISAS/JAXA M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), W. Iwakiri, M. Tashiro, Y. Terada, A. Endo, K. Onda, T. Sugasahara (Saitama U.), Y. Urata (NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, Y. Hanabata (Hiroshima U.), E. Sonoda, M. Yamauchi, N. Ohmori, K. Kono, H. Hayashi (Univ. of Miyazaki), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), on behalf of the Suzaku WAM team, report: The long GRB 090411B (Fermi-GBM trigger #261186466/090411991; Preece et al., GCN 9131) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 23:47:38 UT (=T0). The observed light curve shows a multi-peaked structure starting at T0-1s, ending at T0+25s with a duration (T90) of about 20 seconds. The fluence in 100 - 1000 keV was 7.6 +/- 0.3 x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+6s was 2.3 +/- 0.2 photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-1s to T0+22s is well fitted by a single power-law with a photon index of 2.4 +/- 0.1 (chi^2/d.o.f = 23.2/21). 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 available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html