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 v2.48
Process Start Time: Wed Oct 19 23:57:16 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger994165
======================================================================
Trigger: 00994165 Segment: 000
BAT Trigger Time: 620636992 [s; MET]
Trigger Stop: 620637096 [s; MET]
UTC: 2020-09-01T07:09:26.441920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 217.879251310693 Dec: -38.7163321024524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.77
Analysis Position: [ source = BAT ]
RA: 217.879251310693 Dec: -38.7163321024524 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 217.860261104162 Dec: -38.7042311011426 [deg; J2000]
{ 14h 31m 26.5s , -38d 42' 15.2" }
+/- 2.98734307967546 [arcmin] (estimated 90% radius based on SNR)
+/- 1.8215609488422 [arcmin] (formal 1-sigma fit error)
SNR: 6.3700033858981
Angular difference between the analysis and refined position is 1.147898 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 705.939999938011 +/- 148.706358816395
Measured from: 52.1000000238419
to: 758.039999961853 [s; relative to TRIGTIME]
T50: 222.799999952316 +/- 86.5053386745445
Measured from: 158.919999957085
to: 381.719999909401 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 68.62399995327
to: 69.62399995327 [s; relative to TRIGTIME]
Total Fluence
Measured from: 32.1399999856949
to: 901.324000000954 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.025206 3.486970 1.762457 0.256965
0.207129 0.189113 0.157775 0.135433 [error]
Peak 0.027946 0.006047 0.014422 0.014551
0.006919 0.006963 0.005840 0.004994 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 869.184 32.140 901.324
T90 705.940 52.100 758.040
T50 222.800 158.920 381.720
Peak 1.000 68.624 69.624
====== 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 -1.928 -0.126 0.123 - - - 5.64e-04 -4.40e-05 4.36e-05 71.300 57
CPL -0.928 -0.578 0.666 47.200 -6.901 10.645 1.99e-03 -1.02e-03 2.59e-03 61.740 56
=== 1-s peak 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 -1.999 -2.445 2.817 - - - 2.64e-03 -2.64e-03 1.61e-03 52.470 57
CPL -1.820 -4.089 -0.736 9999.360 -9505.214 -9362.423 2.76e-03 -2.76e-03 -1.48e-03 52.540 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 9.37e-07 1.33e-06 1.40e-06 2.71e-06 4.51e-06 6.37e-06 erg/cm2
90%_error_low -9.49e-08 -8.87e-08 -1.48e-07 -5.41e-07 -3.42e-07 -6.98e-07 erg/cm2
90%_error_hi 9.74e-08 8.87e-08 1.49e-07 6.27e-07 3.46e-07 7.62e-07 erg/cm2
Peak flux PL 1.79e-01 1.31e-01 6.41e-02 4.37e-02 3.95e-01 4.21e-01 ph/cm2/s
90%_error_low -1.79e-01 -9.17e-02 -6.41e-02 -4.37e-02 -1.62e-01 -1.99e-01 ph/cm2/s
90%_error_hi 1.40e-01 5.50e-02 7.49e-02 8.01e-01 1.62e-01 5.34e-01 ph/cm2/s
Fluence CPL 8.26e-07 1.47e-06 1.37e-06 6.77e-07 4.11e-06 4.33e-06 erg/cm2
90%_error_low -1.15e-07 -1.17e-07 -1.75e-07 -3.43e-07 -3.80e-07 -5.18e-07 erg/cm2
90%_error_hi 1.16e-07 1.20e-07 1.70e-07 7.19e-07 3.97e-07 8.04e-07 erg/cm2
Peak flux CPL 1.65e-01 3.04e-02 2.90e-03 3.52e-04 1.99e-01 2.00e-01 ph/cm2/s
90%_error_low -1.07e-01 -3.04e-02 -2.90e-03 -3.52e-04 -1.36e-01 -1.38e-01 ph/cm2/s
90%_error_hi 1.09e-01 6.84e-02 2.88e-02 1.69e-02 1.70e-01 1.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 217.8603 -38.7042 0.0301 24.2814 27.1109 0.8194602 6.370 TRIG_00994165 Foreground time interval of the image: 32.140 113.701 (delta_t = 81.561 [sec]) Background time interval of the image: -239.000 32.140 (delta_t = 271.140 [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 32.140 sec. to 901.324 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.92792 ( -0.126029 0.122909 ) Norm@50keV : 5.64250E-04 ( -4.40333e-05 4.35507e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 71.30 using 59 bins. Reduced chi-squared = 1.25088 # Null hypothesis probability of 9.63e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 869.2 sec: 8.19579E-02 ( -0.0055905 0.0055984 ) ph/cm2/s Energy fluence (15-150 keV) : 4.51159e-06 ( -3.4194e-07 3.45986e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.140 sec. to 901.324 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.928094 ( -0.577505 0.665728 ) Epeak [keV] : 47.2005 ( -6.90131 10.6453 ) Norm@50keV : 1.99500E-03 ( -0.00101872 0.00258658 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 61.74 using 59 bins. Reduced chi-squared = 1.1025 # Null hypothesis probability of 2.79e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 869.2 sec: 7.78071E-02 ( -0.0060325 0.0060414 ) ph/cm2/s Energy fluence (15-150 keV) : 4.11367e-06 ( -3.80313e-07 3.974e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 68.624 sec. to 69.624 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.99881 ( -2.42802 2.83472 ) Norm@50keV : 2.63664E-03 ( -0.00259802 0.00165248 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.47 using 59 bins. Reduced chi-squared = 0.920526 # Null hypothesis probability of 6.45e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.395295 ( -0.162387 0.162296 ) ph/cm2/s Energy fluence (15-150 keV) : 2.31244e-08 ( -1.50743e-08 2.04218e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 68.624 sec. to 69.624 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -5.03486 ( -1.18886 2.16373 ) Epeak [keV] : 590.743 ( -60.835 81.9559 ) Norm@50keV : 9.99235E-05 ( -0.000159116 0.00111829 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 46.83 using 59 bins. Reduced chi-squared = 0.83625 # Null hypothesis probability of 8.04e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.198798 ( -0.135855 0.16968 ) ph/cm2/s Energy fluence (15-150 keV) : 1.68372e-08 ( -1.68368e-08 1.09971e-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 = 4.015590938595142E-01, IMY = -2.055848774308623E-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: -239.000000 32.140000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5101 -40.5642 2.0 36.8 -146.5 2.1506 5.8 1.0 Vela X-1 170.2748 -60.6293 2.9 15.1 163.1 1.0586 4.0 1.3 Cen X-3 186.6673 -62.7867 1.6 13.9 130.9 2.0001 7.2 1.0 GX 301-2 263.3151 -68.0876 2.5 40.8 96.6 4.5047 4.7 ------ UNKNOWN 251.8401 -48.4778 3.9 41.5 65.3 2.7114 3.0 ------ UNKNOWN 246.5523 -26.5735 2.7 50.6 36.8 4.8677 4.3 ------ UNKNOWN 224.7086 -67.5722 2.2 26.5 98.7 1.9817 5.3 ------ UNKNOWN 217.8175 -38.7045 2.1 24.3 27.1 1.5692 5.4 ------ UNKNOWN 101.3755 -53.1271 2.3 50.7 -179.1 3.7770 5.0 ------ UNKNOWN 213.2085 -3.8270 2.3 50.3 -14.8 2.6662 4.9 ------ UNKNOWN 213.2429 2.7220 2.4 56.4 -17.7 4.8888 4.9 ------ UNKNOWN 122.2011 -37.1685 3.0 47.3 -150.8 2.4359 3.9 ------ UNKNOWN 203.9202 -1.6642 3.0 49.4 -27.2 2.1480 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 32.140000 113.700610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4494 -40.6006 3.2 36.8 -146.6 0.6063 3.6 4.5 Vela X-1 170.7257 -60.6863 0.0 15.0 162.3 -0.1762 -1.6 12.6 Cen X-3 186.6064 -62.8130 25.3 13.9 131.0 -0.0533 -0.5 2.9 GX 301-2 232.3020 -32.6677 2.0 37.3 31.6 1.1483 5.7 ------ UNKNOWN 217.8620 -38.7053 1.8 24.3 27.1 0.8019 6.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 158.900590 961.700620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.0687 -60.7219 5.6 36.7 -170.8 -2.8695 -2.1 9.4 Cen X-3 186.6423 -62.7741 3.6 30.5 179.7 3.8795 3.2 0.5 GX 301-2 244.9782 -15.6371 0.2 33.1 25.3 65.1660 50.9 0.2 Sco X-1 255.9878 -37.8681 1.7 29.7 72.4 11.0145 6.9 1.4 4U 1700-377 256.2480 -36.5372 11.9 30.3 69.9 -1.5777 -1.0 11.3 GX 349+2 262.9592 -24.7514 33.6 40.4 55.3 -0.8351 -0.3 2.7 GX 1+4 264.8166 -44.4106 7.5 35.1 86.7 3.6432 1.5 3.9 4U 1735-44 263.1073 -33.8848 9.1 36.4 68.6 2.9243 1.3 6.6 GX 354-0 257.7147 -54.2850 2.5 31.0 105.2 7.7086 4.6 ------ UNKNOWN 251.8794 -50.1385 3.5 26.5 98.5 5.0186 3.3 ------ UNKNOWN 249.6187 -12.2981 2.9 38.6 27.4 6.3633 3.9 ------ UNKNOWN 217.8145 -38.6973 1.7 0.0 -98.2 5.9996 6.6 ------ UNKNOWN 240.4748 14.0346 2.6 56.8 -1.7 17.4729 4.4 ------ UNKNOWN 231.8975 4.6631 2.7 45.3 -8.2 6.9931 4.4 ------ UNKNOWN 229.6716 7.9047 4.3 47.9 -12.3 4.9980 2.7 ------ UNKNOWN 197.0726 -16.3727 3.7 28.8 -73.1 5.0768 3.1 ------ UNKNOWN 222.5980 16.4241 3.9 55.3 -22.6 10.1631 3.0 ------ UNKNOWN 167.6099 -25.7366 3.2 43.9 -116.4 19.3018 3.7 ------ UNKNOWN