Gamma-ray Burst 090324

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #9029
  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.
• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SuperAGILE NOTICE
  NOTICE_DATE:     Tue 24 Mar 09 08:50:20 UT
  NOTICE_TYPE:     SuperAGILE GRB Ground Position
  TRIGGER_NUM:     1069
  GRB_RA:          257.178d {+17h 08m 43s} (J2000),
                   257.352d {+17h 09m 24s} (current),
                   256.235d {+17h 04m 56s} (1950)
  GRB_DEC:         -48.147d {-48d 08' 48"} (J2000),
                   -48.158d {-48d 09' 29"} (current),
                   -48.083d {-48d 04' 57"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical plus systematic]
  GRB_INTEN:       290.092   282.639 [X & Y cnts]
  GRB_SIGNIF:      6.62  7.83 [sigma]
  GRB_DATE:        14914 TJD;    83 DOY;   09/03/24
  GRB_TIME:        10090.00 SOD {02:48:10.00} UT
  SUN_POSTN:         3.53d {+00h 14m 08s}   +1.53d {+01d 31' 47"}
  SUN_DIST:        101.87 [deg]   Sun_angle= 7.1 [hr] (West of Sun)
  MOON_POSTN:      337.06d {+22h 28m 14s}   -7.09d {-07d 05' 20"}
  MOON_DIST:        77.86 [deg]
  MOON_ILLUM:      6 [%]
  GAL_COORDS:      340.04, -4.72 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      260.59,-25.13 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SuperAGILE GRB Coordinates.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        SuperAGILE ground GRB coordinates  
  

• red DSS finding chart ps-file
  
  
• GCN Circular #9061
  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) 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