GRB090623A

This page lists all entries on GRB090623A in GRBweb

Summary Fermi GBM GCN 9566 GCN 9577

Summary table
Variable Value Source
GRB_name_Fermi GRB090623107
T0 2:34:17.560 UTC GCN_circulars,Fermi GBM Det
ra 309.0000° Fermi_GBM
decl -43.2400° Fermi_GBM
pos_error 3.05e+00° Fermi_GBM
T90 47.105 s Fermi_GBM
T90_error 2.573 s Fermi_GBM
T90_start 2:34:17.882 UTC Fermi_GBM
fluence 1.18e-05 erg/cm² Fermi_GBM
fluence_error 7.15e-08 erg/cm² Fermi_GBM
T100 47.427 s
GBM_located True
mjd 55005.10714768519 GCN_circulars,Fermi GBM Det
Fermi GBM table
GRB_name_Fermi GRB090623107
trigger_name bn090623107
ra 309.0000°
decl -43.2400°
pos_error 3.05e+00°
datum 2009-06-23
t_trigger 2:34:17.562 UTC
T90 47.105 s
T90_error 2.573 s
T90_start 2:34:17.882 UTC
fluence 1.18e-05 erg/cm²
fluence_error 7.15e-08 erg/cm²
flux_1024 6.22e+00 erg/cm²/s
flux_1024_error 1.83e-01 erg/cm²/s
flux_1024_time 5.76e-01 erg/cm²/s
flux_64 8.53e+00 erg/cm²/s
flux_64_error 7.52e-01 erg/cm²/s
GCN 9566 table
GRB_name GRB090623A
GCN_number 9566
Detection_method Fermi GBM Det
t_trigger 2:34:17.560 UTC
ra 309.0000°
decl -43.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9566 SUBJECT: GRB 090623: Fermi GBM detection DATE: 09/06/23 14:52:32 GMT FROM: Arne Rau at MPE Arne Rau (MPE) reports on behalf of the Fermi GBM Team: "At 02:34:17.56 UT on 23 June 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090623 (trigger 267417259 / 090623107). The on-ground calculated location, using the GBM trigger data, is RA = 309.0deg, DEC = -43.2 deg (J2000 degrees, equivalent to 20 h 36 m, -43 d 12 '), with an uncertainty of 2.0 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 73 degrees. This burst was also independently detected by INTEGRAL SPI-ACS. The GBM light curve consists of at least five peaks with a duration (T90) of about 72.2 s (8-1000 keV). The time-averaged spectrum from T0-1.920 s to T0+40.064 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -0.73 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 476 +/- 39 keV (chi squared 738 for 655 d.o.f.). The event fluence (8-1000 keV) in this time interval is (9.60 +/- 0.02)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+0.003 s in the 8-1000 keV band is 3.30 +/- 0.04 ph/s/cm^2. A Band function fits the spectrum equally well (chi squared 737 for 654 d.o.f.) with Epeak= 428 +/- 51 keV, alpha = -0.69 +/- 0.05 and beta = -2.3 +/- 0.4. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 9577 table
GRB_name GRB090623A
GCN_number 9577
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 9577 SUBJECT: GRB 090623: Suzaku WAM observation of the prompt emission DATE: 09/06/26 03:41:48 GMT FROM: Yujin E. Nakagawa at RIKEN Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.), 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), on behalf of the Suzaku WAM team, report: The long GRB 090623 (Fermi/GBM trigger 267417259 / 090623107, Rau et al., GCN 9566) was detected by the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 02:34:17.04 UT (=T0). The observed light curve shows a multi-peaked structure lasting from T0-2 s, ending at T0+48 s, with a duration (T90) of about 38 seconds. The fluence in 100 - 1000 keV was 2.7 (-0.9, +0.2) * 10^-5 ergs/cm^2. The 1-s peak flux measured from T0+0.5 s was 5.3 (-1.2, +0.3) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-2 s to T0+48 s is well fitted by a power-law with an exponential cutoff model: dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with alpha 1.0(-0.3, +0.3), and Epeak 601(-100, +147) keV (chi2^/d.o.f. = 15/18). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves for this burst is available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html