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 v2.46
Process Start Time: Thu Apr 5 17:30:51 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger814305
======================================================================
Trigger: 00814305 Segment: 000
BAT Trigger Time: 542759037.568 [s; MET]
Trigger Stop: 542759038.592 [s; MET]
UTC: 2018-03-14T22:23:36.943440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.866097981945 Dec: 23.6232874833055 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.74
Image Trigger?: NO
Rate S/N Ratio: 6.6332495807108 [ if not an image trigger ]
Image S/N Ratio: 7.74
Analysis Position: [ source = BAT ]
RA: 297.866097981945 Dec: 23.6232874833055 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 297.858782792225 Dec: 23.6437538156809 [deg; J2000]
{ 19h 51m 26.1s , +23d 38' 37.5" }
+/- 1.9876312547135 [arcmin] (estimated 90% radius based on SNR)
+/- 0.701973818371764 [arcmin] (formal 1-sigma fit error)
SNR: 11.4005119818874
Angular difference between the analysis and refined position is 1.292137 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 55.4240000247955 +/- 6.53960234232175
Measured from: -44.9279999732971
to: 10.4960000514984 [s; relative to TRIGTIME]
T50: 23.3919999599457 +/- 18.9169824036978
Measured from: -18.191999912262
to: 5.20000004768372 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.347999930381775
to: 0.652000069618225 [s; relative to TRIGTIME]
Total Fluence
Measured from: -51.1200000047684
to: 11.9359999895096 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.683231 0.646664 0.288378 -0.037625
0.074392 0.071904 0.060031 0.048489 [error]
Peak 0.061192 0.044882 0.032422 0.004851
0.010392 0.009564 0.007791 0.006060 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 63.056 -51.120 11.936
T90 55.424 -44.928 10.496
T50 23.392 -18.192 5.200
Peak 1.000 -0.348 0.652
====== 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 -2.346 -0.265 0.242 - - - 1.37e-03 -2.57e-04 2.52e-04 53.120 57
CPL -1.573 -0.427 1.313 20.724 N/A N/A 4.11e-03 N/A N/A 51.250 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 -2.210 -0.422 0.364 - - - 7.81e-03 -2.15e-03 2.04e-03 58.090 57
CPL -1.918 N/A N/A 12.474 N/A N/A 1.14e-02 N/A N/A 57.970 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 2.46e-07 2.71e-07 2.13e-07 2.77e-07 8.33e-07 1.01e-06 erg/cm2
90%_error_low -3.90e-08 -3.63e-08 -5.25e-08 -1.12e-07 -1.24e-07 -1.91e-07 erg/cm2
90%_error_hi 3.97e-08 3.58e-08 5.55e-08 1.54e-07 1.28e-07 2.20e-07 erg/cm2
Peak flux PL 6.39e-01 4.24e-01 1.83e-01 1.09e-01 1.30e+00 1.35e+00 ph/cm2/s
90%_error_low -1.67e-01 -8.31e-02 -6.38e-02 -5.84e-02 -2.51e-01 -2.61e-01 ph/cm2/s
90%_error_hi 1.75e-01 8.26e-02 6.58e-02 8.72e-02 2.51e-01 2.61e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -3.90e-08 -3.63e-08 -5.25e-08 -1.12e-07 -1.24e-07 -1.91e-07 erg/cm2
90%_error_hi 3.97e-08 3.58e-08 5.55e-08 1.54e-07 1.28e-07 2.20e-07 erg/cm2
Peak flux CPL 6.20e-01 4.38e-01 1.85e-01 7.97e-02 1.29e+00 1.32e+00 ph/cm2/s
90%_error_low N/A N/A -6.77e-02 -7.97e-02 -2.54e-01 N/A ph/cm2/s
90%_error_hi N/A N/A 6.91e-02 1.04e-01 2.48e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 297.8588 23.6438 0.0168 33.3038 -152.6777 2.0300866 11.401 TRIG_00814305 Foreground time interval of the image: -51.120 11.936 (delta_t = 63.056 [sec]) Background time interval of the image: -129.467 -51.120 (delta_t = 78.347 [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 -51.120 sec. to 11.936 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.34627 ( -0.265386 0.242233 ) Norm@50keV : 1.36974E-03 ( -0.000256972 0.000251898 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.12 using 59 PHA bins. # Reduced chi-squared = 0.9320 for 57 degrees of freedom # Null hypothesis probability = 6.213302e-01 Photon flux (15-150 keV) in 63.06 sec: 0.245721 ( -0.030457 0.030459 ) ph/cm2/s Energy fluence (15-150 keV) : 8.33054e-07 ( -1.24286e-07 1.27947e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.120 sec. to 11.936 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57291 ( -0.427269 1.3126 ) Epeak [keV] : 20.7242 ( ) Norm@50keV : 4.11126E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.25 using 59 PHA bins. # Reduced chi-squared = 0.9152 for 56 degrees of freedom # Null hypothesis probability = 6.549154e-01 Photon flux (15-150 keV) in 63.06 sec: 0.240354 ( -0.030982 0.031074 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.348 sec. to 0.652 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21027 ( -0.421672 0.364219 ) Norm@50keV : 7.80730E-03 ( -0.00214982 0.00203505 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.09 using 59 PHA bins. # Reduced chi-squared = 1.019 for 57 degrees of freedom # Null hypothesis probability = 4.348104e-01 Photon flux (15-150 keV) in 1 sec: 1.29967 ( -0.25068 0.25081 ) ph/cm2/s Energy fluence (15-150 keV) : 7.35275e-08 ( -1.676e-08 1.72838e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.348 sec. to 0.652 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.9179 ( ) Epeak [keV] : 12.4742 ( ) Norm@50keV : 1.13781E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.97 using 59 PHA bins. # Reduced chi-squared = 1.035 for 56 degrees of freedom # Null hypothesis probability = 4.026600e-01 Photon flux (15-150 keV) in 1 sec: 1.28900 ( -0.25357 0.24837 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 55.424 sec. Hardness ratio (energy fluence ratio) = 0.786665550033
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.168653e-07 S(50-150 keV) = 3.161892e-07
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 = -5.836790542854300E-01, IMY = 3.015471837407213E-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: -129.467410 -51.120000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9519 -15.6344 1.7 36.4 67.4 2.0483 6.9 1.6 Sco X-1 254.3186 35.3881 7.0 47.2 148.0 -0.7700 -1.7 7.3 Her X-1 256.0113 -37.8846 2.5 39.7 27.8 1.0212 4.6 2.7 4U 1700-377 256.5817 -36.5137 12.2 38.4 28.6 -0.2157 -0.9 8.9 GX 349+2 262.9775 -24.7778 3.9 25.9 35.5 0.4315 3.0 2.6 GX 1+4 264.6040 -44.4220 9.8 41.8 14.1 -0.2525 -1.2 6.2 4U 1735-44 268.5081 -1.6057 204.7 12.3 102.6 -0.0079 -0.1 12.4 SW J1753.5-0127 270.1412 -24.9161 7.4 22.2 22.3 0.2237 1.6 12.5 GX 5-1 270.2080 -25.8026 3.2 23.0 21.1 0.5169 3.6 6.2 GRS 1758-258 273.8628 -13.8762 0.0 11.0 32.3 0.0698 0.5 12.7 GX 17+2 275.9683 -30.4188 7.9 25.8 5.9 0.2038 1.5 3.8 H1820-303 285.1823 -25.0713 14.3 20.7 -15.3 -0.1110 -0.8 12.1 HT1900.1-2455 288.7948 10.9553 1.4 18.0 -155.0 1.1189 8.4 0.6 GRS 1915+105 299.6040 35.1761 1.2 44.0 -160.0 2.3574 9.7 1.7 Cyg X-1 308.2257 40.9231 9.4 52.5 -156.4 0.5475 1.2 5.5 Cyg X-3 263.0075 -33.8260 49.1 33.1 24.2 0.0422 0.2 1.1 GX 354-0 275.0926 7.1923 0.4 13.2 153.8 3.6355 26.8 ------ UNKNOWN 281.2686 52.1879 2.5 57.1 177.9 4.1415 4.6 ------ UNKNOWN 320.7358 22.3895 2.7 48.0 -129.1 2.7747 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -51.120000 11.936000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8671 -15.5828 7.3 36.4 67.5 -0.4795 -1.6 7.4 Sco X-1 254.3339 35.2705 11.9 47.1 147.9 0.4374 1.0 7.4 Her X-1 256.0476 -37.8053 4.4 39.6 27.8 -0.6279 -2.6 3.7 4U 1700-377 256.3751 -36.4919 5.1 38.5 28.9 0.5050 2.3 5.1 GX 349+2 262.9224 -24.8787 9.5 26.0 35.4 -0.1936 -1.2 9.3 GX 1+4 264.5661 -44.5723 0.0 42.0 14.0 0.1471 0.6 10.5 4U 1735-44 268.2641 -1.4409 6.4 12.6 103.0 0.2598 1.8 6.3 SW J1753.5-0127 270.1199 -25.1988 3.7 22.5 22.0 0.4215 3.1 11.5 GX 5-1 270.1583 -25.8054 5.9 23.0 21.2 -0.2788 -2.0 8.6 GRS 1758-258 274.0184 -14.0748 6.4 11.1 31.1 0.2302 1.8 2.4 GX 17+2 276.0810 -30.3816 12.8 25.8 5.7 -0.1346 -0.9 8.1 H1820-303 285.1852 -25.0550 6.2 20.6 -15.3 -0.2535 -1.9 11.4 HT1900.1-2455 288.7892 10.7971 11.6 17.8 -154.7 0.1360 1.0 8.9 GRS 1915+105 299.4549 35.3272 7.5 44.1 -160.2 0.3863 1.5 10.0 Cyg X-1 308.1551 40.9660 23.4 52.5 -156.4 -0.2378 -0.5 2.2 Cyg X-3 262.8244 -33.9100 11.9 33.2 24.3 0.1730 1.0 9.4 GX 354-0 243.7156 14.2150 2.7 41.1 115.5 2.2340 4.3 ------ UNKNOWN 267.2594 -39.0105 2.2 36.1 14.6 0.9246 5.2 ------ UNKNOWN 286.5631 46.2648 2.3 51.5 -177.3 2.1181 5.0 ------ UNKNOWN 297.8588 23.6438 1.0 33.3 -152.7 2.0299 11.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 73.732630 962.532000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6367 35.3998 6.4 39.1 100.9 -4.7788 -1.8 9.4 Her X-1 268.3168 -1.4052 7.0 38.1 36.3 2.4644 1.7 4.2 SW J1753.5-0127 270.1968 -24.9909 14.0 55.5 13.9 -3.3600 -0.8 7.1 GX 5-1 270.3492 -25.8179 10.3 56.1 13.3 5.0830 1.1 5.2 GRS 1758-258 274.0526 -14.0708 14.0 44.3 17.3 1.2806 0.8 3.4 GX 17+2 285.1733 -24.8480 5.4 50.0 -1.7 -3.8429 -2.1 8.6 HT1900.1-2455 288.8084 10.9391 0.9 15.3 19.0 10.8718 12.9 0.7 GRS 1915+105 299.5870 35.2044 0.3 11.7 170.3 32.5102 35.9 0.2 Cyg X-1 308.0772 40.9924 1.8 19.4 -172.9 5.3500 6.5 2.8 Cyg X-3 326.1543 38.5075 8.0 28.3 -145.2 -1.5022 -1.4 11.2 Cyg X-2 275.0793 7.1896 0.3 27.3 40.0 39.9758 39.6 ------ UNKNOWN 293.6823 8.3970 2.4 15.7 -1.4 4.1346 4.7 ------ UNKNOWN 352.1337 69.4938 2.8 55.8 -176.6 16.9962 4.1 ------ UNKNOWN 348.2288 38.9357 2.5 45.1 -138.9 10.2861 4.6 ------ UNKNOWN 343.3148 19.0306 3.3 42.4 -109.6 16.2030 3.5 ------ UNKNOWN