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 GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Thu May 31 13:25:50 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger831810
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Trigger: 00831810 Segment: 000
BAT Trigger Time: 547673095.232 [s; MET]
Trigger Stop: 547673096.256 [s; MET]
UTC: 2018-05-10T19:24:34.309920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.318496902141 Dec: -31.9109448076993 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.84
Image Trigger?: NO
Rate S/N Ratio: 22.9128784747792 [ if not an image trigger ]
Image S/N Ratio: 11.84
Analysis Position: [ source = BAT ]
RA: 276.318496902141 Dec: -31.9109448076993 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 276.338636377679 Dec: -31.917968500946 [deg; J2000]
{ 18h 25m 21.3s , -31d 55' 04.7" }
+/- 0.859859238158921 [arcmin] (estimated 90% radius based on SNR)
+/- 0.302521840957937 [arcmin] (formal 1-sigma fit error)
SNR: 37.739277165375
Angular difference between the analysis and refined position is 1.108908 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 64 +/- 16
Measured from: -15.2319999933243
to: 48.7680000066757 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.76800000667572
to: 16.7680000066757 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.26800000667572
to: 9.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2319999933243
to: 64.7680000066757 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.307364 3.447369 2.979017 0.746756
0.097345 0.098385 0.084255 0.062077 [error]
Peak 0.086244 0.154273 0.124640 0.054110
0.014326 0.015080 0.013579 0.009418 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
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====== Table of the duration information =============================
Value tstart tstop
T100 80.000 -15.232 64.768
T90 64.000 -15.232 48.768
T50 16.000 0.768 16.768
Peak 1.000 8.268 9.268
====== 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: CPL)
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 -1.458 -0.058 0.058 - - - 8.28e-03 -2.64e-04 2.64e-04 65.360 57
CPL -1.035 -0.234 0.247 127.708 -27.413 84.388 1.29e-02 -2.71e-03 3.64e-03 55.440 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 -1.216 -0.183 0.186 - - - 2.88e-02 -3.01e-03 3.00e-03 51.230 57
CPL -1.175 -0.224 0.497 999.907 -999.907 -999.907 3.03e-02 N/A N/A 51.370 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 8.13e-07 1.53e-06 2.23e-06 6.92e-06 6.33e-06 1.15e-05 erg/cm2
90%_error_low -5.07e-08 -5.72e-08 -8.50e-08 -5.76e-07 -2.11e-07 -6.26e-07 erg/cm2
90%_error_hi 5.19e-08 5.70e-08 8.48e-08 6.10e-07 2.12e-07 6.53e-07 erg/cm2
Peak flux PL 9.03e-01 1.08e+00 9.27e-01 1.36e+00 3.39e+00 4.27e+00 ph/cm2/s
90%_error_low -1.85e-01 -1.40e-01 -1.07e-01 -3.12e-01 -3.74e-01 -4.52e-01 ph/cm2/s
90%_error_hi 1.99e-01 1.38e-01 1.06e-01 3.64e-01 3.75e-01 4.55e-01 ph/cm2/s
Fluence CPL 7.32e-07 1.57e-06 2.32e-06 4.16e-06 6.19e-06 8.79e-06 erg/cm2
90%_error_low -6.48e-08 -6.24e-08 -9.93e-08 -9.48e-07 -2.27e-07 -9.63e-07 erg/cm2
90%_error_hi 6.63e-08 6.28e-08 1.00e-07 1.30e-06 2.26e-07 1.30e-06 erg/cm2
Peak flux CPL 9.02e-01 1.07e+00 9.25e-01 1.43e+00 3.40e+00 4.34e+00 ph/cm2/s
90%_error_low N/A -1.51e-01 N/A N/A N/A -8.07e-01 ph/cm2/s
90%_error_hi N/A 1.55e-01 N/A N/A N/A 3.82e-01 ph/cm2/s
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