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 Dec 18 16:33:00 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1262764
======================================================================
Trigger: 01262764 Segment: 000
BAT Trigger Time: 751675386.432 [s; MET]
Trigger Stop: 751675387.456 [s; MET]
UTC: 2024-10-26T22:42:32.007860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 293.423540289295 Dec: 57.9803069280196 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.81
Image Trigger?: NO
Rate S/N Ratio: 35.8608421540822 [ if not an image trigger ]
Image S/N Ratio: 6.81
Analysis Position: [ source = BAT ]
RA: 293.423540289295 Dec: 57.9803069280196 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 293.424517175427 Dec: 57.9957792754803 [deg; J2000]
{ 19h 33m 41.9s , +57d 59' 44.8" }
+/- 1.25397164489979 [arcmin] (estimated 90% radius based on SNR)
+/- 0.479555264729935 [arcmin] (formal 1-sigma fit error)
SNR: 22.0144255214821
Angular difference between the analysis and refined position is 0.928861 arcmin
Partial Coding Fraction: 0.1796875 [ including projection effects ]
Duration
T90: 24.9760000705719 +/- 5.81496004563543
Measured from: -0.600000023841858
to: 24.37600004673 [s; relative to TRIGTIME]
T50: 9.08800005912781 +/- 1.85937619165206
Measured from: 1.12799990177155
to: 10.2159999608994 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.29200005531311
to: 0.70799994468689 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.30400002002716
to: 30.9839999675751 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.930467 1.379490 1.152250 0.226351
0.085073 0.090383 0.077562 0.061687 [error]
Peak 0.106505 0.151066 0.180247 0.044710
0.017070 0.019642 0.019375 0.014673 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 32.288 -1.304 30.984
T90 24.976 -0.600 24.376
T50 9.088 1.128 10.216
Peak 1.000 -0.292 0.708
====== 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 -1.555 -0.121 0.120 - - - 8.05e-03 -5.75e-04 5.74e-04 55.570 57
CPL -0.991 -0.485 0.543 92.659 -23.298 205.093 1.52e-02 -6.31e-03 1.24e-02 51.560 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 -1.373 -0.213 0.210 - - - 3.27e-02 -4.06e-03 4.05e-03 45.620 57
CPL -1.258 -1.222 0.745 358.072 -358.072 -358.072 3.71e-02 -2.87e-02 4.22e-02 45.640 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 3.50e-07 6.21e-07 8.46e-07 2.38e-06 2.45e-06 4.19e-06 erg/cm2
90%_error_low -4.20e-08 -4.69e-08 -7.62e-08 -4.26e-07 -1.86e-07 -4.90e-07 erg/cm2
90%_error_hi 4.35e-08 4.67e-08 7.58e-08 4.83e-07 1.86e-07 5.33e-07 erg/cm2
Peak flux PL 1.19e+00 1.29e+00 9.99e-01 1.26e+00 3.96e+00 4.75e+00 ph/cm2/s
90%_error_low -2.58e-01 -1.80e-01 -1.50e-01 -3.53e-01 -5.04e-01 -5.97e-01 ph/cm2/s
90%_error_hi 2.76e-01 1.78e-01 1.47e-01 4.20e-01 5.05e-01 6.01e-01 ph/cm2/s
Fluence CPL 3.15e-07 6.55e-07 8.85e-07 1.15e-06 2.37e-06 3.01e-06 erg/cm2
90%_error_low -5.11e-08 -5.57e-08 -8.54e-08 -4.94e-07 -1.98e-07 -5.27e-07 erg/cm2
90%_error_hi 5.22e-08 5.70e-08 8.70e-08 9.79e-07 1.99e-07 9.70e-07 erg/cm2
Peak flux CPL 1.18e+00 1.30e+00 1.01e+00 1.27e+00 3.96e+00 4.69e+00 ph/cm2/s
90%_error_low -3.21e-01 -1.83e-01 -1.54e-01 -7.02e-01 -5.12e-01 -8.62e-01 ph/cm2/s
90%_error_hi 2.16e-01 1.98e-01 1.83e-01 2.38e-01 4.97e-01 6.49e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 293.4245 57.9958 0.0088 41.1878 43.9055 3.2879857 22.014 TRIG_01262764 Foreground time interval of the image: -1.304 15.269 (delta_t = 16.573 [sec]) Background time interval of the image: -239.432 -1.304 (delta_t = 238.128 [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 -1.304 sec. to 30.984 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5553 ( -0.120571 0.119848 ) Norm@50keV : 8.05350E-03 ( -0.000575437 0.000574305 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.57 using 59 bins. Reduced chi-squared = 0.974912 # Null hypothesis probability of 5.29e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 32.29 sec: 1.02113 ( -0.075333 0.0755 ) ph/cm2/s Energy fluence (15-150 keV) : 2.44663e-06 ( -1.85643e-07 1.86475e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.304 sec. to 30.984 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.990803 ( -0.484919 0.543441 ) Epeak [keV] : 92.6594 ( -23.2979 205.093 ) Norm@50keV : 1.52430E-02 ( -0.00630931 0.0124168 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 51.56 using 59 bins. Reduced chi-squared = 0.920714 # Null hypothesis probability of 6.43e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 32.29 sec: 0.995257 ( -0.078542 0.078653 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37022e-06 ( -1.98474e-07 1.98572e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.292 sec. to 0.708 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37332 ( -0.212514 0.209622 ) Norm@50keV : 3.27189E-02 ( -0.00405559 0.00404904 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 45.62 using 59 bins. Reduced chi-squared = 0.800351 # Null hypothesis probability of 8.60e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 3.96115 ( -0.50366 0.50475 ) ph/cm2/s Energy fluence (15-150 keV) : 3.17965e-07 ( -4.31819e-08 4.3345e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.292 sec. to 0.708 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.36975 ( -1.21432 0.752833 ) Epeak [keV] : 9991.73 ( -9979.55 -9979.55 ) Norm@50keV : 3.28460E-02 ( -0.0244364 0.0464706 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 45.62 using 59 bins. Reduced chi-squared = 0.814643 # Null hypothesis probability of 8.38e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 3.95576 ( -0.51164 0.49687 ) ph/cm2/s Energy fluence (15-150 keV) : 3.17614e-07 ( -4.3791e-08 4.14815e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 24.976 sec. Hardness ratio (energy fluence ratio) = 1.36106851837
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.710663e-07 S(50-150 keV) = 1.4755593e-06
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 = 6.304651909874337E-01, IMY = -6.068264940130329E-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: -239.432000 -1.304000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9733 -15.6284 1.8 43.1 -123.7 6.8004 6.5 0.8 Sco X-1 254.3954 35.1394 0.0 18.1 -13.7 -0.4463 -1.4 12.6 Her X-1 262.9935 -24.7395 7.5 46.3 -150.8 0.9613 1.5 0.9 GX 1+4 268.4214 -1.4883 4.6 22.8 -158.6 0.7606 2.5 3.9 SW J1753.5-0127 270.2802 -25.0840 27.0 46.5 -159.9 0.3069 0.4 0.4 GX 5-1 270.3084 -25.7472 43.9 47.1 -159.9 0.1979 0.3 0.4 GRS 1758-258 273.9235 -13.9075 8.5 35.7 -167.1 0.5394 1.4 9.1 GX 17+2 275.9483 -30.4184 5.5 52.3 -165.7 -1.9432 -2.1 3.3 H1820-303 285.1383 -24.8872 92.5 49.2 -177.7 0.1036 0.1 5.9 HT1900.1-2455 288.8062 11.1020 4.9 22.7 136.7 -0.8814 -2.4 9.4 GRS 1915+105 299.5921 35.2025 0.7 31.2 80.0 9.2942 15.8 0.1 Cyg X-1 308.3209 40.8258 0.0 39.5 74.3 1.9637 1.4 12.2 Cyg X-3 262.8678 -33.8569 18.0 55.3 -151.8 -0.9596 -0.6 6.2 GX 354-0 276.9096 40.5264 3.3 20.8 43.6 1.1801 3.5 ------ UNKNOWN 270.5634 7.5128 3.1 14.1 -168.7 1.0728 3.8 ------ UNKNOWN 238.1696 47.5408 2.7 35.4 -11.6 1.6725 4.3 ------ UNKNOWN 279.8446 -29.3584 3.1 52.0 -170.1 3.4226 3.7 ------ UNKNOWN 277.4714 -25.7415 2.4 48.0 -168.6 3.2085 4.8 ------ UNKNOWN 233.6866 36.3475 2.1 33.1 -32.1 2.2655 5.5 ------ UNKNOWN 233.0136 11.7468 2.3 34.4 -77.1 2.8978 5.0 ------ UNKNOWN 218.5082 20.8075 3.5 45.6 -57.8 5.1826 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.304000 15.268610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0203 -15.6993 22.2 43.1 -123.8 0.0712 0.5 4.3 Sco X-1 254.3025 35.3518 82.1 18.3 -13.4 -0.0066 -0.1 7.6 Her X-1 263.0156 -24.7527 1100.5 46.3 -150.8 -0.0010 -0.0 0.6 GX 1+4 268.4357 -1.2656 0.0 22.6 -158.7 0.0649 1.3 11.9 SW J1753.5-0127 270.2244 -25.0464 12.4 46.4 -159.8 -0.0805 -0.9 3.8 GX 5-1 270.4294 -25.7211 7.4 47.1 -160.0 0.1370 1.6 7.0 GRS 1758-258 273.8467 -14.0003 25.2 35.8 -166.9 -0.0294 -0.5 9.5 GX 17+2 275.9530 -30.2360 2.7 52.1 -165.7 -0.5177 -4.3 8.0 H1820-303 284.9206 -24.9288 7.9 49.2 -177.5 0.1554 1.5 6.3 HT1900.1-2455 288.6213 11.0370 0.0 22.6 137.1 0.1443 2.4 11.8 GRS 1915+105 299.5104 35.1511 73.3 31.1 80.0 0.0154 0.2 5.0 Cyg X-1 308.1686 41.0694 6.5 39.4 73.9 0.3933 1.8 7.5 Cyg X-3 263.0791 -33.8443 6.2 55.3 -152.0 -0.3689 -1.9 4.5 GX 354-0 293.4245 57.9958 0.5 41.2 43.9 3.2878 22.0 ------ UNKNOWN 225.9721 50.5900 2.3 43.7 -14.2 0.4016 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 96.868590 962.620100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6674 35.3827 12.6 34.1 -100.4 1.9345 0.9 10.5 Her X-1 288.9506 10.8748 20.9 47.2 -160.0 -1.5564 -0.6 9.9 GRS 1915+105 299.5948 35.1989 0.4 23.2 -178.8 36.4609 31.6 0.3 Cyg X-1 308.2140 40.9730 2.1 19.4 158.7 5.9863 5.5 4.9 Cyg X-3 326.0162 38.1956 19.1 28.9 132.9 1.0524 0.6 10.5 Cyg X-2 152.3982 78.7384 4.5 41.3 3.3 4.1783 2.6 ------ UNKNOWN 296.7408 6.0470 2.7 52.0 -170.2 14.6164 4.3 ------ UNKNOWN 296.5343 3.5140 2.7 54.5 -169.8 15.3242 4.3 ------ UNKNOWN 179.7511 67.6037 3.3 45.3 -15.4 6.4023 3.5 ------ UNKNOWN 220.8581 65.6862 2.3 33.1 -32.1 7.3288 5.1 ------ UNKNOWN