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: Sat Jul 30 01:08:53 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1000926
======================================================================
Trigger: 01000926 Segment: 000
BAT Trigger Time: 624865672 [s; MET]
Trigger Stop: 624865736 [s; MET]
UTC: 2020-10-20T05:47:26.163700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.246012461438 Dec: 31.4249402594 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.2
Analysis Position: [ source = BAT ]
RA: 261.246012461438 Dec: 31.4249402594 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 261.239624507865 Dec: 31.427961223256 [deg; J2000]
{ 17h 24m 57.5s , +31d 25' 40.7" }
+/- 1.136074977336 [arcmin] (estimated 90% radius based on SNR)
+/- 0.380068937613371 [arcmin] (formal 1-sigma fit error)
SNR: 25.3492743017725
Angular difference between the analysis and refined position is 0.373924 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 14.3600000143051 +/- 4.7507310775274
Measured from: 11.1799999475479
to: 25.539999961853 [s; relative to TRIGTIME]
T50: 5.14399993419647 +/- 0.667892212469055
Measured from: 14.7039999961853
to: 19.8479999303818 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.1720000505447
to: 18.1720000505447 [s; relative to TRIGTIME]
Total Fluence
Measured from: 7.85599994659424
to: 30.1720000505447 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.791954 0.702471 0.327368 0.019252
0.043223 0.039924 0.032656 0.026855 [error]
Peak 0.083312 0.097361 0.057407 0.008153
0.009845 0.009728 0.007860 0.005782 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 22.316 7.856 30.172
T90 14.360 11.180 25.540
T50 5.144 14.704 19.848
Peak 1.000 17.172 18.172
====== 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 -2.263 -0.143 0.138 - - - 4.35e-03 -3.96e-04 3.90e-04 45.340 57
CPL -2.256 -0.152 0.131 9999.360 N/A N/A 4.36e-03 N/A N/A 45.350 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 -1.937 -0.199 0.190 - - - 1.45e-02 -1.92e-03 1.89e-03 47.140 57
CPL -1.099 -0.828 1.017 46.084 -16.283 92.818 4.36e-02 -4.36e-02 1.23e-01 44.160 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 2.55e-07 2.95e-07 2.46e-07 3.46e-07 9.21e-07 1.14e-06 erg/cm2
90%_error_low -2.50e-08 -2.00e-08 -3.09e-08 -7.92e-08 -7.01e-08 -1.17e-07 erg/cm2
90%_error_hi 2.55e-08 2.00e-08 3.16e-08 9.42e-08 7.10e-08 1.27e-07 erg/cm2
Peak flux PL 9.11e-01 7.08e-01 3.70e-01 2.79e-01 2.12e+00 2.27e+00 ph/cm2/s
90%_error_low -1.45e-01 -7.88e-02 -6.28e-02 -8.13e-02 -2.37e-01 -2.53e-01 ph/cm2/s
90%_error_hi 1.50e-01 7.88e-02 6.31e-02 9.87e-02 2.38e-01 2.53e-01 ph/cm2/s
Fluence CPL 2.41e-07 2.84e-07 2.42e-07 2.05e-07 8.95e-07 1.00e-06 erg/cm2
90%_error_low -1.85e-08 -1.20e-08 -3.42e-08 -8.23e-08 -4.09e-08 -1.41e-07 erg/cm2
90%_error_hi 1.38e-08 5.29e-08 3.40e-08 1.35e-07 7.81e-08 3.30e-07 erg/cm2
Peak flux CPL 8.36e-01 7.82e-01 3.72e-01 1.03e-01 2.07e+00 2.09e+00 ph/cm2/s
90%_error_low -1.66e-01 -1.07e-01 -7.47e-02 N/A -2.43e-01 -2.57e-01 ph/cm2/s
90%_error_hi 1.68e-01 1.11e-01 7.16e-02 N/A 2.43e-01 2.76e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 261.2396 31.4280 0.0076 26.2682 1.4715 1.9500141 25.349 TRIG_01000926 Foreground time interval of the image: 7.856 30.172 (delta_t = 22.316 [sec]) Background time interval of the image: -239.000 7.856 (delta_t = 246.856 [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 7.856 sec. to 30.172 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.26288 ( -0.143187 0.137806 ) Norm@50keV : 4.34678E-03 ( -0.000396484 0.000390026 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 45.34 using 59 bins. Reduced chi-squared = 0.795439 # Null hypothesis probability of 8.67e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 22.32 sec: 0.744348 ( -0.051163 0.051245 ) ph/cm2/s Energy fluence (15-150 keV) : 9.21285e-07 ( -7.00993e-08 7.0995e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.856 sec. to 30.172 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.2565 ( -0.149494 0.133409 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 4.36421E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 45.35 using 59 bins. Reduced chi-squared = 0.809821 # Null hypothesis probability of 8.45e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 22.32 sec: 0.743830 ( -0.05078 0.052038 ) ph/cm2/s Energy fluence (15-150 keV) : 8.9494e-07 ( -4.0928e-08 7.81298e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 17.172 sec. to 18.172 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.93738 ( -0.199356 0.189744 ) Norm@50keV : 1.45147E-02 ( -0.00192357 0.00188545 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.14 using 59 bins. Reduced chi-squared = 0.827018 # Null hypothesis probability of 8.21e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.11700 ( -0.23739 0.23754 ) ph/cm2/s Energy fluence (15-150 keV) : 1.33552e-07 ( -1.70455e-08 1.72718e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.172 sec. to 18.172 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.0987 ( -0.827825 1.01695 ) Epeak [keV] : 46.0839 ( -16.2829 92.8179 ) Norm@50keV : 4.35937E-02 ( -0.0435942 0.123275 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 44.16 using 59 bins. Reduced chi-squared = 0.788571 # Null hypothesis probability of 8.74e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.06561 ( -0.24285 0.24302 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24733e-07 ( -1.84142e-08 1.91999e-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 = 4.933771844710977E-01, IMY = -1.267426044624128E-02
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 7.856000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9888 -15.6477 0.4 29.1 -127.4 11.6295 29.0 0.7 Sco X-1 254.4901 35.4052 2.6 31.6 -7.7 1.6802 4.5 4.1 Her X-1 255.9339 -37.9878 4.9 44.3 -160.2 1.4817 2.4 9.0 4U 1700-377 256.4909 -36.5678 17.1 42.8 -160.3 0.3819 0.7 9.1 GX 349+2 263.0174 -24.6947 3.3 30.2 -166.7 1.2651 3.5 3.1 GX 1+4 264.7412 -44.3006 13.2 49.7 -170.2 -0.7150 -0.9 9.0 4U 1735-44 268.4916 -1.4160 4.5 7.6 164.0 -0.7631 -2.6 7.7 SW J1753.5-0127 270.3096 -25.0775 5.9 30.9 -179.6 0.8350 2.0 1.4 GX 5-1 270.4125 -25.5729 0.0 31.4 -179.6 1.1199 2.6 11.8 GRS 1758-258 274.1126 -14.0573 3.4 21.4 165.1 1.0871 3.4 6.3 GX 17+2 275.9368 -30.3573 42.3 37.2 174.0 0.1446 0.3 0.8 H1820-303 284.9727 -24.7849 6.6 35.8 157.7 0.9792 1.8 8.8 HT1900.1-2455 288.6534 10.9266 6.9 23.8 84.4 -0.8552 -1.7 8.6 GRS 1915+105 299.7536 35.2307 9.3 43.5 51.4 1.6473 1.2 8.2 Cyg X-1 263.0128 -33.8544 18.6 39.3 -167.8 0.2863 0.6 1.7 GX 354-0 300.3235 1.0746 4.7 35.3 105.1 1.7781 2.5 ------ UNKNOWN 271.9198 -38.7183 2.9 44.6 -178.1 2.5330 4.0 ------ UNKNOWN 227.8449 -5.1900 3.1 38.9 -96.0 4.1027 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 7.856000 30.172000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9897 -15.7783 6.5 29.2 -127.6 -0.1671 -1.8 8.3 Sco X-1 254.5892 35.4556 5.5 31.6 -7.5 0.1812 2.1 9.4 Her X-1 256.0427 -37.6974 7.9 44.0 -160.2 -0.1860 -1.5 9.2 4U 1700-377 256.5206 -36.2747 4.1 42.5 -160.3 -0.3480 -2.8 9.8 GX 349+2 262.8781 -24.8199 5.1 30.3 -166.4 0.1880 2.3 8.4 GX 1+4 264.7871 -44.4567 15.8 49.9 -170.3 0.1394 0.7 1.9 4U 1735-44 268.4225 -1.5583 4.8 7.7 165.0 0.1602 2.4 7.1 SW J1753.5-0127 270.3430 -25.1421 3.4 31.0 -179.7 0.2917 3.4 4.9 GX 5-1 270.1783 -25.7737 7.6 31.6 -179.2 -0.1288 -1.5 7.0 GRS 1758-258 274.0288 -13.9612 16.9 21.3 165.2 -0.0508 -0.7 4.7 GX 17+2 275.7587 -30.2461 0.0 37.1 174.2 0.2213 2.2 11.3 H1820-303 285.1655 -24.9592 9.5 36.0 157.6 0.1375 1.2 7.4 HT1900.1-2455 288.8258 10.9035 64.6 23.9 84.6 -0.0179 -0.2 3.0 GRS 1915+105 299.6854 35.1572 13.0 43.4 51.5 0.2531 0.9 5.4 Cyg X-1 262.9238 -33.8410 740.4 39.3 -167.7 -0.0015 -0.0 3.3 GX 354-0 261.2396 31.4280 0.5 26.3 1.5 1.9499 25.3 ------ UNKNOWN 257.2076 -22.7391 2.1 29.3 -155.4 0.4328 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 125.500590 881.600600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4219 35.3029 2.1 6.9 -25.1 3.9434 5.5 2.9 Her X-1 263.0022 -24.6015 59.6 56.1 -153.2 -0.7078 -0.2 8.7 GX 1+4 268.4309 -1.4231 6.1 33.6 -164.4 -1.7149 -1.9 4.2 SW J1753.5-0127 270.4114 -25.0722 6.1 57.2 -161.2 6.9401 1.9 6.9 GX 5-1 274.1278 -14.1475 13.4 47.2 -168.5 1.4255 0.9 9.7 GX 17+2 288.9601 10.8542 0.0 32.9 151.3 -3.5188 -3.0 11.0 GRS 1915+105 299.6341 35.0777 5.6 32.1 101.6 2.5032 2.0 7.7 Cyg X-1 308.0183 40.8350 15.1 38.5 91.1 1.9690 0.8 8.2 Cyg X-3 302.6673 54.0923 3.2 37.1 68.7 5.7130 3.6 ------ UNKNOWN 264.8293 61.7577 4.2 30.4 32.1 2.7594 2.7 ------ UNKNOWN 252.5935 62.4135 3.5 31.5 21.1 3.0525 3.3 ------ UNKNOWN 197.3492 64.9079 3.6 50.8 -0.7 4.8729 3.2 ------ UNKNOWN 205.9114 27.3078 4.0 47.9 -51.4 9.8155 2.9 ------ UNKNOWN