GRB 121029A

A. von Kienlin reports on behalf of the Fermi GBM Team:

"At 08:24:19.93 UT on 29 October 2012, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 121029A (trigger 373191862 / 121029350).

The on-ground calculated location, using the GBM trigger
data, is RA = 226.8, DEC = -28.2 (J2000 degrees,
equivalent to 15h 07m, -28d 12'), with an uncertainty
of 1.7 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 57 degrees.

The burst triggered an ARR (Automatic Repointing Request), 
causing Fermi to slew so the LAT would point to the source.  

This burst was also independently detected by INTEGRAL SPI-ACS.

The GBM light curve shows a double-peaked burst 
with a duration (T90) of about 16 s (50-300 keV).
The time-averaged spectrum from T0-0.128 s to T0+15.104 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -0.63 +/- 0.07  and
the cutoff energy, parameterized as Epeak, is 188 +/- 10 keV.

The event fluence (10-1000 keV) in this time interval is
(7.82 +/- 0.06)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+11.84 s in the 10-1000 keV band
is 13.3 +/- 0.3  ph/s/cm^2.

A Band function fits the spectrum equally well with Epeak= 176 +/- 13 keV, 
alpha = -0.57 +/- 0.09  and beta = -2.82 +/- 0.42.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."

W. Iwakiri, M. Tashiro, Y. Terada,  T. Yasuda, M. Asahina,
S. Kobayashi, A. Sakamoto, Y. Ishida, S. Sugimoto,  H. Ueno(Saitama U.),
M. Akiyama, N. Ohmori, E. Mochinaga, M. Yamauchi (Univ. of Miyazaki),
Y. E. Nakagawa (Waseda U.),
Y. Hanabata, T. Kawano, K. Takaki, R. Nakamura, Y.Tanaka, M. Ohno,
Y. Fukazawa (Hiroshima U.), S. Sugita (Nagoya U.), K. Yamaoka,
M. Kokubun, T. Takahashi (ISAS/JAXA),
Y. Urata, P. Tsai (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo),
on behalf of the Suzaku WAM team, report:

The long GRB 121029A ( Fermi-GBM detection : von Kienlin et al., GCN 13925
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 )
was detected by the the Suzaku Wide-band  All-sky Monitor (WAM) which covers an
 energy range of 50 keV - 5 MeV at 08:24:18 UT (=T0).

The observed light curve shows multi-peaked structure starting at T0-2
s, ending
 at T0+20 s with a duration
 (T90) of about 15 seconds. The fluence in 100 - 1000 keV was 6.05
(-0.33, +0.29) x 10^-6 erg/cm^2.
 The 1-s peak flux measured from T0+14 s was 4.63 (-0.42, +0.44)
photons/cm^2/s in the same
 energy range.

Preliminary result shows that the time-averaged spectrum from T0-2 s to
T0+20 s is well fitted by a single power-law with a photon index
of 2.76 (-0.21, +0.23) (chi^2/d.o.f = 6.9/14).

All the quoted errors are at statistical 90% confidence level,
in which the systematic uncertainties are not included.

The light curves with 1-sec time resolution for this burst will be appeared at:

 http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html