GRB090411A

This page lists all entries on GRB090411A in GRBweb

Summary Fermi GBM GCN 9130 GCN 9146

Summary table
Variable Value Source
GRB_name_Fermi GRB090411838
T0 20:06:36.889 UTC Fermi_GBM
ra 156.0000° Fermi_GBM
decl -68.9000° Fermi_GBM
pos_error 3.24e+00° Fermi_GBM
T90 21.501 s Fermi_GBM
T90_error 3.237 s Fermi_GBM
T90_start 20:06:36.892 UTC Fermi_GBM
fluence 6.67e-06 erg/cm² Fermi_GBM
fluence_error 1.03e-07 erg/cm² Fermi_GBM
T100 21.504 s
GBM_located True
mjd 54932.83792695602 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB090411838
trigger_name bn090411838
ra 156.0000°
decl -68.9000°
pos_error 3.24e+00°
datum 2009-04-11
t_trigger 20:06:36.889 UTC
T90 21.501 s
T90_error 3.237 s
T90_start 20:06:36.892 UTC
fluence 6.67e-06 erg/cm²
fluence_error 1.03e-07 erg/cm²
flux_1024 5.24e+00 erg/cm²/s
flux_1024_error 2.32e-01 erg/cm²/s
flux_1024_time 3.00e-03 erg/cm²/s
flux_64 8.77e+00 erg/cm²/s
flux_64_error 1.06e+00 erg/cm²/s
GCN 9130 table
GRB_name GRB090411A
GCN_number 9130
Detection_method Fermi GBM Det
t_trigger 20:06:36.890 UTC
ra 159.3400°
decl -68.3600°
Circular_text 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."
GCN 9146 table
GRB_name GRB090411A
GCN_number 9146
Detection_method Suzaku WAM Det
Circular_text 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