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.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.47
Process Start Time: Mon May 18 15:21:56 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger944091
======================================================================
Trigger: 00944091 Segment: 000
BAT Trigger Time: 597902808 [s; MET]
Trigger Stop: 597902872 [s; MET]
UTC: 2019-12-13T04:06:23.920500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 224.506862496787 Dec: -9.72629906539117 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.12
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.12
Analysis Position: [ source = BAT ]
RA: 224.506862496787 Dec: -9.72629906539117 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 224.530746546275 Dec: -9.74827388942352 [deg; J2000]
{ 14h 58m 07.4s , -09d 44' 53.8" }
+/- 2.19045838130391 [arcmin] (estimated 90% radius based on SNR)
+/- 1.17542240819362 [arcmin] (formal 1-sigma fit error)
SNR: 9.92292708211085
Angular difference between the analysis and refined position is 1.932170 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 118.991999983788 +/- 18.2649067514448
Measured from: -19.0240000486374
to: 99.9679999351501 [s; relative to TRIGTIME]
T50: 66.7519999742508 +/- 12.298222875383
Measured from: 6.82799994945526
to: 73.5799999237061 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 99.9479999542236
to: 100.947999954224 [s; relative to TRIGTIME]
Total Fluence
Measured from: -33.5240000486374
to: 111.067999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.899593 1.432753 0.806227 0.381427
0.101456 0.105654 0.093635 0.084372 [error]
Peak 0.014885 0.026602 0.029648 0.009012
0.008693 0.008897 0.008145 0.006883 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 144.592 -33.524 111.068
T90 118.992 -19.024 99.968
T50 66.752 6.828 73.580
Peak 1.000 99.948 100.948
====== 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: N/A)
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 -1.494 -0.166 0.164 - - - 1.57e-03 -1.46e-04 1.45e-04 79.860 57
CPL -1.488 -0.620 -0.492 9998.900 N/A N/A 1.57e-03 N/A N/A 79.870 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 -1.379 -0.586 0.584 - - - 4.40e-03 -1.70e-03 1.69e-03 49.320 57
CPL 1.625 -2.788 -1.625 62.632 -17.564 110.620 1.23e-01 -1.23e-01 2.36e+02 45.890 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 2.88e-07 5.31e-07 7.54e-07 2.26e-06 2.15e-06 3.83e-06 erg/cm2
90%_error_low -4.43e-08 -5.00e-08 -9.32e-08 -5.50e-07 -2.21e-07 -6.31e-07 erg/cm2
90%_error_hi 4.60e-08 4.96e-08 9.27e-08 6.64e-07 2.24e-07 7.23e-07 erg/cm2
Peak flux PL 1.62e-01 1.74e-01 1.34e-01 1.68e-01 5.33e-01 6.38e-01 ph/cm2/s
90%_error_low -8.95e-02 -7.26e-02 -5.91e-02 -1.08e-01 -2.07e-01 -2.47e-01 ph/cm2/s
90%_error_hi 1.07e-01 7.18e-02 5.91e-02 1.80e-01 2.09e-01 2.51e-01 ph/cm2/s
Fluence CPL 2.91e-07 5.27e-07 7.49e-07 2.38e-06 2.18e-06 3.72e-06 erg/cm2
90%_error_low -5.31e-08 -4.58e-08 -8.80e-08 -1.26e-06 -2.50e-07 -1.06e-06 erg/cm2
90%_error_hi 4.84e-08 5.63e-08 9.80e-08 1.96e-07 1.95e-07 8.04e-07 erg/cm2
Peak flux CPL 8.30e-02 2.15e-01 1.72e-01 2.53e-02 4.94e-01 4.94e-01 ph/cm2/s
90%_error_low -8.30e-02 -1.33e-01 -8.17e-02 -2.53e-02 -2.11e-01 -2.10e-01 ph/cm2/s
90%_error_hi 1.27e-01 9.85e-02 8.93e-02 1.19e-01 2.10e-01 2.21e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 224.5307 -9.7483 0.0193 26.1388 -100.8609 2.0500788 9.923 TRIG_00944091 Foreground time interval of the image: -33.524 73.901 (delta_t = 107.425 [sec]) Background time interval of the image: -203.699 -33.524 (delta_t = 170.175 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -33.524 sec. to 111.068 sec. XSPEC12>exit XSPEC: quit Photon index: -1.49396 ( -0.165702 0.164447 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.49396 ( -0.164447 0.165702 ) Norm@50keV : 1.56852E-03 ( -0.000145789 0.000144761 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 144.6 sec: 0.195501 ( -0.017807 0.017836 ) ph/cm2/s Energy fluence (15-150 keV) : 2.15402e-06 ( -2.20901e-07 2.23578e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.524 sec. to 111.068 sec. XSPEC: quit Photon index: -2.07942 ( -0.028768 0.0988803 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.07942 ( -0.0988803 0.028768 ) Epeak [keV] : 30.6651 ( ) Norm@50keV : 7.37021E-04 ( ) ------------------------------------------------------------ Photon flux (15-150 keV) in 144.6 sec: 0.196248 ( -0.021014 0.019296 ) ph/cm2/s Energy fluence (15-150 keV) : 2.17911e-06 ( -2.49503e-07 1.94934e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 99.948 sec. to 100.948 sec. XSPEC12>exit XSPEC: quit Photon index: -1.37937 ( -0.583193 0.586328 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.37937 ( -0.586328 0.583193 ) Norm@50keV : 4.39897E-03 ( -0.00169454 0.00168822 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.533408 ( -0.206793 0.208709 ) ph/cm2/s Energy fluence (15-150 keV) : 4.26707e-08 ( -1.73334e-08 1.78286e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 99.948 sec. to 100.948 sec. XSPEC: quit Photon index: 1.62454 ( -2.92284 -1.75889 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62454 ( 1.75889 2.92284 ) Epeak [keV] : 62.6316 ( -17.339 110.846 ) Norm@50keV : 0.123279 ( -0.141121 235.564 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.493965 ( -0.211322 0.210055 ) ph/cm2/s Energy fluence (15-150 keV) : 3.84397e-08 ( -1.50605e-08 1.72032e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -9.246658166793836E-02, IMY = 4.819441498251124E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -203.699420 -33.524000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.9221 -62.7759 6.1 59.4 -18.5 -2.7296 -1.9 7.3 GX 301-2 199.5689 -9.9495 2.8 5.9 -31.9 0.9345 4.2 ------ UNKNOWN 232.8370 -3.3101 2.3 34.0 -114.9 1.6476 5.0 ------ UNKNOWN 208.3000 -59.9422 2.1 56.4 -30.5 6.6948 5.5 ------ UNKNOWN 231.3879 -35.6936 3.2 43.6 -64.1 3.0321 3.6 ------ UNKNOWN 242.9259 -0.3279 2.6 44.2 -118.5 3.7224 4.5 ------ UNKNOWN 239.4837 -13.7275 3.3 41.3 -98.5 3.0916 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -33.524000 73.900610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.8932 -62.7882 43.8 59.4 -18.5 0.2710 0.3 6.6 GX 301-2 177.4525 22.3858 2.1 33.7 117.8 1.6958 5.6 ------ UNKNOWN 224.5308 -9.7482 1.2 26.1 -100.9 2.0502 9.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 173.900600 653.734000 661.000000 718.028700 721.000000 963.135600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4537 35.3430 1.3 27.2 -110.9 6.7350 9.2 0.2 Her X-1 299.6421 35.2985 12.8 50.9 -157.7 1.4607 0.9 6.3 Cyg X-1 308.1632 40.9882 8.0 51.3 -169.0 2.8783 1.4 3.2 Cyg X-3 179.9329 14.9147 2.5 55.6 1.5 13.2279 4.7 ------ UNKNOWN 207.2060 44.3843 2.8 18.2 -2.6 2.5157 4.1 ------ UNKNOWN 181.7311 12.3233 3.8 57.0 -1.8 11.1440 3.1 ------ UNKNOWN 309.4405 38.6339 2.6 53.7 -167.9 8.3676 4.4 ------ UNKNOWN 203.6288 11.8035 2.5 48.7 -26.8 5.5365 4.6 ------ UNKNOWN 278.1022 23.9444 2.6 48.0 -129.1 10.6878 4.4 ------ UNKNOWN