GRB090117C

This page lists all entries on GRB090117C in GRBweb

Summary Fermi GBM GCN 8822 GCN 8836

Summary table
Variable Value Source
GRB_name_Fermi GRB090117632
T0 15:09:40.783 UTC Fermi_GBM
ra 121.6000° Fermi_GBM
decl -38.8000° Fermi_GBM
pos_error 3.56e+00° Fermi_GBM
T90 86.017 s Fermi_GBM
T90_error 2.862 s Fermi_GBM
T90_start 15:09:40.783 UTC Fermi_GBM
fluence 9.06e-06 erg/cm² Fermi_GBM
fluence_error 4.39e-08 erg/cm² Fermi_GBM
T100 86.017 s
GBM_located True
mjd 54848.631722025464 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB090117632
trigger_name bn090117632
ra 121.6000°
decl -38.8000°
pos_error 3.56e+00°
datum 2009-01-17
t_trigger 15:10:40.176 UTC
T90 86.017 s
T90_error 2.862 s
T90_start 15:09:40.783 UTC
fluence 9.06e-06 erg/cm²
fluence_error 4.39e-08 erg/cm²
flux_1024 3.81e+00 erg/cm²/s
flux_1024_error 2.87e-01 erg/cm²/s
flux_1024_time 2.25e+01 erg/cm²/s
flux_64 6.67e+00 erg/cm²/s
flux_64_error 1.39e+00 erg/cm²/s
GCN 8822 table
GRB_name GRB090117C
GCN_number 8822
Detection_method Fermi GBM Det
t_trigger 15:10:40.180 UTC
ra 117.6000°
decl -40.3000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8822 SUBJECT: GRB 090117C - Fermi GRB Detection DATE: 09/01/18 06:15:23 GMT FROM: Valerie Connaughton at MSFC Valerie Connaughton (UAH) reports on behalf of the Fermi GBM Team: "At 15:10:40.18 UT on 17 Jan 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090117C (trigger 253897842 / 090117632). The on-ground calculated location, using the GBM trigger data, is RA = 117.6, DEC = -40.3 (J2000 degrees, equivalent to 07h 50m, -40d 18'), with an uncertainty of 1.8 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 54 degrees. The GBM light curve consists of a precursor lasting tens of seconds until trigger time, followed by a single episode with substructure lasting a further 35 s. The total duration (T90) between 8 and 1000 keV is about 86 s. The time-averaged spectrum of the main emission from T0-2 s to T0+29 s is best fit by a Band function with Epeak = 247 +/- 41 keV, alpha = -1.0 +/- 0.1, and beta = -2.1 +/- 0.2, giving an 8-1000 keV fluence of (1.1 +/- 0.1) E-5 erg/cm^2. The precursor spectrum from T0-55 sec to T0-6 s is best fit using a power law function with an exponential high energy cutoff. The power law index is -1.3 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 147 +/- 38 keV. The 8-1000 keV fluence of the precursor is (3.9 +/- 0.5) E-6 erg/cm^2. A 1-sec peak photon flux of 4.2 +/- 0.7 ph/s/cm^2 in the 8-1000 keV band is measured starting at T0+22.5 s. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 8836 table
GRB_name GRB090117C
GCN_number 8836
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8836 SUBJECT: GRB 090117C: Suzaku WAM observation of the prompt emission DATE: 09/01/22 12:37:45 GMT FROM: Kazutaka Yamaoka at Aoyama Gakuin U M. Suzuki, M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), H. Hayashi, E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori, K. Kono (Univ. of Miyazaki), A. Endo, M. Tashiro, Y. Terada, Y. Urata, K. Onda, N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Sugita, K. Yamaoka (Aoyama Gakuin U.), Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira (Hiroshima U.), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), on behalf of the Suzaku WAM team, report: The long GRB 090117C (Connaughton et al., GCN8822) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2009-01-17 15:10:40 UT (=T0). The observed light curve shows relatively strong emission from T0-6 s to T0+32 s with a precursor of about 1 min. long. The duration (T90) including the precursor is about 91 seconds. The fluence in 100 - 1000 keV was (1.18 +/- 0.11) x 10^-5 erg/cm^2. The 1-s peak flux measured from T0+22 s was 1.2 (+/-0.3) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-78 s to T0+32 s is fitted by a single power-law with a photon index of 1.72 +/- 0.18 (chi^2/d.o.f = 14/12). 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