GRB090528A

This page lists all entries on GRB090528A in GRBweb

Summary Fermi GBM GCN 9446 GCN 9483

Summary table
Variable Value Source
GRB_name_Fermi GRB090528173
T0 4:08:54.485 UTC Fermi_GBM
ra 134.9000° Fermi_GBM
decl -35.8000° Fermi_GBM
pos_error 3.51e+00° Fermi_GBM
T90 35.905 s Fermi_GBM
T90_error 2.187 s Fermi_GBM
T90_start 4:08:54.485 UTC Fermi_GBM
fluence 6.56e-06 erg/cm² Fermi_GBM
fluence_error 1.14e-07 erg/cm² Fermi_GBM
T100 35.905 s
GBM_located True
mjd 54979.17285283565 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB090528173
trigger_name bn090528173
ra 134.9000°
decl -35.8000°
pos_error 3.51e+00°
datum 2009-05-28
t_trigger 4:09:01.141 UTC
T90 35.905 s
T90_error 2.187 s
T90_start 4:08:54.485 UTC
fluence 6.56e-06 erg/cm²
fluence_error 1.14e-07 erg/cm²
flux_1024 4.75e+00 erg/cm²/s
flux_1024_error 1.95e-01 erg/cm²/s
flux_1024_time 4.80e+00 erg/cm²/s
flux_64 7.67e+00 erg/cm²/s
flux_64_error 8.89e-01 erg/cm²/s
GCN 9446 table
GRB_name GRB090528A
GCN_number 9446
Detection_method Fermi GBM Det
t_trigger 4:09:01.140 UTC
ra 134.9000°
decl -35.8000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9446 SUBJECT: GRB 090528: Fermi GBM detection DATE: 09/05/30 15:34:09 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 04:09:01.14 UT on 28 May 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090528 (trigger 265176543 / 090528173). The on-ground calculated location, using the GBM trigger data, is RA = 134.9, DEC = -35.8 (J2000 degrees, equivalent to 09h 00m, -35d 48'), with an uncertainty of 3.4 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The GBM on-ground location is within two sigma of the Vela X-1 position, nevertheless we think this event is due to a real gamma-ray burst because intensity, duration and spectrum are unusual for Vela X-1 observed outburst. The angle from the Fermi LAT boresight is 81 degrees. The GBM light consists of one major structured pulse with a duration (T90) of about 68 s (8-1000 keV). The time-averaged spectrum from T0-5.120 s to T0+29.696 s is well fit by a power law function with an exponential high energy cutoff. The power law index is -1.7 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 99 +/- 26 keV (chi squared 357 for 359 d.o.f.). The event fluence (8-1000 keV) in this time interval is (9.3 +/- 0.9)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.072 s in the 8-1000 keV band is 7.6 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 9483 table
GRB_name GRB090528A
GCN_number 9483
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 9483 SUBJECT: GRB 090528: Suzaku WAM observation of the prompt emission DATE: 09/06/03 01:55:34 GMT FROM: Yujin E. Nakagawa at RIKEN Y. E. Nakagawa, T. Tamagawa (RIKEN), K. Yamaoka, S. Sugita (Aoyama Gakuin 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), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), on behalf of the Suzaku WAM team, report: The long GRB 090528 (Fermi/GBM trigger 265176543 / 090528173, von Kienlin et al., GCN 9446) was detected by the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 04:09:01.00 UT (=T0). The observed light curve shows a single-peaked structure lasting from T0-8s, ending at T0+28s, with a duration (T90) of about 26.0 seconds. The fluence in 100 - 1000 keV was 1.9 (+0.2/-0.7) * 10^-6 erg/cm^2. The 1-s peak flux measured from T0+2.5s was 0.5 (+0.2/-0.3) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-4s to T0+22s is well fitted by a single power-law with a photon index of 2.6 (+0.7/-0.5) (chi^2/d.o.f = 13/13). 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.ac.jp/suzaku/research/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html