Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
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BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
(This burst occurred during telescope slew)
Process Script Ver: batgrbproduct v2.46
Process Start Time: Tue Nov 11 09:31:06 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB090118
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Trigger: 00031292 Segment: 054
BAT Trigger Time: 253979710.024
UTC: 2009-01-18T13:55:05.598 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst during slew is the T100 start time.
Refined Position: [ source = BAT mosaic image ]
RA: 49.8046534226055 Dec: 18.4471554872135 [deg; J2000]
{ 03h 19m 13.1s , +18d 26' 49.8" }
+/- 1.53851109659 [arcmin] (estimated 90% radius based on SNR)
SNR: 16.439499039
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 13.5239999890327 +/- 1.88347870037055
Measured from: 0.82
to: 14.344 [s; relative to TRIGTIME]
T50: 6.85600000619888 +/- 1.77082128086336
Measured from: 3.128
to: 9.984 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 15.240 0.000 15.240
T90 13.524 0.820 14.344
T50 6.856 3.128 9.984
Peak 1.000 2.976 3.976
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.277 -0.180 0.181 - - - 3.14e-03 -3.08e-04 3.08e-04 45.480 57
CPL -1.231 -0.227 0.470 910.862 -910.862 -910.862 3.31e-03 -4.60e-04 1.57e-04 45.610 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -0.790 -0.386 0.434 - - - 6.01e-03 -1.44e-03 1.36e-03 62.750 57
CPL -0.794 -0.378 0.597 9999.360 -9999.360 -9999.360 6.07e-03 -1.33e-03 1.73e-02 62.760 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 4.97e-08 1.05e-07 1.73e-07 6.46e-07 4.76e-07 9.73e-07 erg/cm2
90%_error_low -8.99e-09 -1.15e-08 -2.15e-08 -1.64e-07 -5.29e-08 -1.80e-07 erg/cm2
90%_error_hi 9.47e-09 1.13e-08 2.12e-08 2.00e-07 5.34e-08 2.11e-07 erg/cm2
Peak flux PL 1.26e-01 1.94e-01 2.24e-01 4.98e-01 6.91e-01 1.04e+00 ph/cm2/s
90%_error_low -5.85e-02 -6.17e-02 -4.77e-02 -2.04e-01 -1.54e-01 -2.37e-01 ph/cm2/s
90%_error_hi 7.16e-02 5.98e-02 4.73e-02 2.91e-01 1.56e-01 2.64e-01 ph/cm2/s
Fluence CPL 4.96e-08 1.04e-07 1.73e-07 6.77e-07 4.78e-07 9.78e-07 erg/cm2
90%_error_low N/A N/A N/A -3.60e-07 -6.03e-08 -3.43e-07 erg/cm2
90%_error_hi N/A N/A N/A 6.68e-08 5.72e-08 9.05e-08 erg/cm2
Peak flux CPL 1.26e-01 1.94e-01 2.24e-01 4.95e-01 6.91e-01 1.06e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A -4.17e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A 2.47e-01 ph/cm2/s
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Special notes of this burst