GRB 090324

F. Lazzarotto, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, 
L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda
(INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, 
P. Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (INAF/OA Cagliari),
S. Vercellone (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti,
M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi,
M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V.
Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. 
Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli 
(INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. 
Lipari, D. Zanello (INFN Roma-1), and  P. Giommi, C. Pittori, 
P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI),
on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 24 March 2009, at 02:48:09 UT.
The event had a duration of about 30 s in the 20-60 keV energy range,
with an overall FRED-like time structure. Assuming a crab-like energy 
spectrum, the peak flux on 1-s timescale was 1.8E-07 erg/cm2/s.
The burst position was reconstructed  as (RA, Dec)
(257.178, -48.147) deg, which is:

RA(J2000)  = 17h 08m 42.73s
Dec(J2000) = -48d 08' 47.59"

with an uncertainty of 3' radius. The given uncertainty accounts
for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

M. Suzuki, M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA),
N. Kodaka, W. Iwakiri, M. Tashiro, Y. Terada, Y. Urata, A. Endo,
K. Onda, K. Morigami, T. Sugasahara (Saitama U.), T. Enoto, 
K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Sugita, K. Yamaoka
(Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, 
T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), 
E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, 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 090324 localized by SuperAGILE (Feroci et al., GCN 9029
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 ) 
triggered the Suzaku Wide-band All-sky Monitor (WAM) which
covers an energy range of 50 keV - 5 MeV at 02:47:17.604 UT (=T0).
The observed light curve shows a double-peaked structure starting at
T0-1s, with a duration (T90) of about 70 seconds. We note that the
second peak starting around T0+50s corresponds to the FRED-like pulse
observed by SuperAGILE.
The fluence in 100 - 1000 keV was 8.8(-2.4, +1.0)x10^-6 erg/cm^2. The
1-s peak flux measured from T0+59s was 0.99(-0.12, +0.05) photons/cm^2/s 
in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-1s
to T0+89s is well fitted by a single power-law with a photon index
of  2.0(-0.2, +0.3) (chi^2/d.o.f = 10.1/13).
From a time resolved analysis of the first peak (T0-1s to T0+49s) and
the second peak (T0+49s to T0+89s), we found that both spectra 
 were fitted by single power-law models.
There is hard to soft spectral evolution from the first peak to the
second peak; corresponding photon indices of the first and the second
intervals are 1.7+/-0.3 and 2.4(-0.3, +0.4) respectively.

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