GRB 091102A
GCN Circular 10126
Subject
GRB 091102A: Fermi GBM observation
Date
2009-11-03T09:40:50Z (16 years ago)
From
Arne Rau at MPE <arau@mpe.mpg.de>
Arne Rau (MPE) reports on behalf of the Fermi GBM Team:
"At 14:34:38.36 UT on 2 November 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 091102A (trigger 278865280 / 091102607) which
was also detected by the Swift-BAT (Hoversten et al. 2009, GCN 10117).
The GBM on-ground location is consistent with the Swift/XRT position
(Kennea et al. 2009, GCN 10120).
The angle from the Fermi LAT boresight is 94 degrees.
The GBM light curve consists of two peaks with a duration (T90)
of about 7.3 +/- 0.4 s (8-1000 keV). The time-averaged spectrum
from T0-1.792 s to T0+3.328 s is adequately by a simple power
law function with index -1.24 +/- 0.03 (C-stat 478 for 387 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(2.1 +/- 0.1)E-06 erg/cm^2. The 1.273-sec peak photon flux measured
starting from T0+0.003 s in the 8-1000 keV band
is 2.9 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 10169
Subject
GRB 091102A: Suzaku WAM observation of the prompt emission
Date
2009-11-14T13:39:04Z (16 years ago)
From
Yuji Urata at Nat. Central U. <urata@astro.ncu.edu.tw>
Y. Urata, H.M Lin (NCU), K. Yamaoka (Aoyama Gakuin U.),
M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA),
S. Sugita (Nagoya U.), Y. E. Nakagawa, T. Tamagawa (RIKEN),
S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.),
N. Ohmori, E. Sonoda, K. Kono, H. Hayashi, A. Daikyuji, Y. Nishioka,
K. Noda, M. Yamauchi (Univ. of Miyazaki), Y. Hanabata, T. Uehara,
T. Takahashi, Y. Fukazawa (Hiroshima U.), W. Iwakiri, M. Tashiro,
Y. Terada, A. Endo, K. Onda, T. Sugasahara (Saitama U.),
T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo),
on behalf of the Suzaku WAM team, report:
"The GRB 091102A (Swift-BAT trigger #374598,GCN Circ. 10117; Fermi-GBM
trigger #278865280, GCN Circ. 10126) triggered the Suzaku Wide-band
All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV
on 2009-11-02 14:34:37.863 UT (=T0).
The observed light curve shows a two-peaked structure, starting at
T0-0.5 s and ending at T0+7.5 s, with a total duration (T90) of 6.6 s.
The fluence in 100 - 1000 keV was 2.31 (-0.61, +0.39) x 10^-6 erg/cm^2.
The 1-s peak flux measured from T0+0.5 s was 1.07 (-0.44, +0.24)
photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from
T0-0.5 s to T0+7.5 s is well fitted by a single power-law with
a photon index of 1.56 (-0.22, +0.24) (chi^2/d.o.f. = 15.2/14).
All the quoted errors are at statistical 90% confidence level,
in which the systematic uncertainties are not included.
The light curves for this burst will be available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html