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This page lists all entries on GRB090428B in GRBweb

Summary Fermi GBM GCN 9295 GCN 9314

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB090428552
T0	13:15:02.607 UTC	Fermi_GBM
ra	0.8000°	Fermi_GBM
decl	11.5000°	Fermi_GBM
pos_error	4.33e+00°	Fermi_GBM
T90	31.488 s	Fermi_GBM
T90_error	11.846 s	Fermi_GBM
T90_start	13:15:02.607 UTC	Fermi_GBM
fluence	5.60e-06 erg/cm²	Fermi_GBM
fluence_error	1.24e-07 erg/cm²	Fermi_GBM
T100	31.488 s
GBM_located	True
mjd	54949.55211350694	Fermi_GBM

Fermi GBM table
GRB_name_Fermi	GRB090428552
trigger_name	bn090428552
ra	0.8000°
decl	11.5000°
pos_error	4.33e+00°
datum	2009-04-28
t_trigger	13:15:11.055 UTC
T90	31.488 s
T90_error	11.846 s
T90_start	13:15:02.607 UTC
fluence	5.60e-06 erg/cm²
fluence_error	1.24e-07 erg/cm²
flux_1024	7.61e+00 erg/cm²/s
flux_1024_error	2.40e-01 erg/cm²/s
flux_1024_time	2.75e+00 erg/cm²/s
flux_64	9.87e+00 erg/cm²/s
flux_64_error	1.16e+00 erg/cm²/s

GCN 9295 table
GRB_name	GRB090428B
GCN_number	9295
Detection_method	Fermi GBM Det
t_trigger	13:15:11.060 UTC
ra	0.8000°
decl	6.5000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 9295 SUBJECT: GRB 090428B: Fermi GBM detection DATE: 09/04/29 15:22:36 GMT FROM: Elisabetta Bissaldi at MPE Elisabetta Bissaldi (MPE) reports on behalf of the Fermi GBM Team: "At 13:15:11.06 UT on 28 April 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090428B (trigger 262617313 / 090428552). The on-ground calculated location, using the GBM trigger data, is RA = 0.8, DEC = +6.5 (J2000 degrees, equivalent to 00h 03m, 06d 30'), with an uncertainty of 4.4 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 101 degrees. The GBM light curve consists of a broad single peak with a duration (T90) of about 30 s (8-1000 keV). The time-averaged spectrum from T0-9.2 s to T0+15.3 s is adequately fit by a power law function with an exponential high energy cutoff. The power law index is -1.86 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 65 +/- 16 keV (chi squared 279 for 241 d.o.f.). The event fluence (8-1000 keV) in this time interval is (5.2 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.1 s in the 8-1000 keV band is 10.1 +/- 0.7 ph/s/cm^2. A Band function fits the spectrum equally well (chi squared 278 for 240 d.o.f.) with Epeak = 53 +/- 19 keV, alpha = -1.81 +/- 0.13 and beta = -2.17 +/- 0.21. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

GCN 9314 table
GRB_name	GRB090428B
GCN_number	9314
Detection_method	Suzaku WAM Det
Circular_text	TITLE: GCN CIRCULAR NUMBER: 9314 SUBJECT: GRB 090428B: Suzaku WAM observation of the prompt emission DATE: 09/05/01 05:22:26 GMT FROM: Takeshi Uehara at Hiroshima U T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa(Hiroshima U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), K. Kono, E. Sonoda, M. Yamauchi, N. Ohmori, H. Hayashi, K. Noda, A. Daikyuji, Y. Nishioka (Univ. of Miyazaki), 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), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), on behalf of the Suzaku WAM team, report: The long GRB 090428B (Fermi/GBM trigger 262617313 / 090428552, Bissaldi et al., GCN 9295) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 13:15:12.66 UT (=T0). The observed light curve shows a single FRED-like peak starting at T0-10s, ending at T0+9s, with a duration (T90) of about 19.0 seconds. The fluence in 100 - 1000 keV was 2.6(+0.5/-0.9) X10^-6 erg/cm^2. The 1-s peak flux measured from T0+1s was 1.1 photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-10s to T0+9s is well fitted by a single power-law with a photon index of 2.0 (+0.5/-0.4) (chi^2/d.o.f = 5/7). 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