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: Fri Jul 29 23:36:37 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1042398
======================================================================
Trigger: 01042398 Segment: 000
BAT Trigger Time: 639846378.304 [s; MET]
Trigger Stop: 639846378.56 [s; MET]
UTC: 2021-04-11T15:05:51.476880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 296.559356259681 Dec: -39.3728157586284 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 14.6969384566991 [ if not an image trigger ]
Image S/N Ratio: 8.09
Analysis Position: [ source = BAT ]
RA: 296.559356259681 Dec: -39.3728157586284 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 296.599206049108 Dec: -39.4012618719957 [deg; J2000]
{ 19h 46m 23.8s , -39d 24' 04.5" }
+/- 0.787544710060317 [arcmin] (estimated 90% radius based on SNR)
+/- 0.274704245068984 [arcmin] (formal 1-sigma fit error)
SNR: 42.7855026984112
Angular difference between the analysis and refined position is 2.515538 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 12.7999999523163 +/- 0.597059479426177
Measured from: 0.379999995231628
to: 13.1799999475479 [s; relative to TRIGTIME]
T50: 6.86799991130829 +/- 0.364263653124258
Measured from: 3.51999998092651
to: 10.3879998922348 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.86800003051758
to: 4.86800003051758 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.448000073432922
to: 14.4399999380112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.418456 1.113022 0.322379 0.034321
0.033714 0.032794 0.026136 0.023159 [error]
Peak 0.221712 0.236745 0.093356 0.009778
0.010831 0.011274 0.008159 0.006053 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 14.888 -0.448 14.440
T90 12.800 0.380 13.180
T50 6.868 3.520 10.388
Peak 1.000 3.868 4.868
====== 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 -2.615 -0.093 0.091 - - - 8.46e-03 -4.96e-04 4.94e-04 73.230 57
CPL -1.619 -0.453 0.503 14.364 -13.490 8.015 3.36e-02 -1.43e-02 3.42e-02 56.450 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 -2.217 -0.111 0.108 - - - 2.84e-02 -2.16e-03 2.14e-03 87.450 57
CPL -1.047 -0.549 0.636 32.637 -7.914 4.832 1.40e-01 -7.29e-02 1.95e-01 72.160 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 4.64e-07 4.36e-07 2.85e-07 2.88e-07 1.30e-06 1.47e-06 erg/cm2
90%_error_low -2.84e-08 -1.82e-08 -2.32e-08 -4.37e-08 -5.57e-08 -7.51e-08 erg/cm2
90%_error_hi 2.89e-08 1.81e-08 2.37e-08 4.90e-08 5.60e-08 7.78e-08 erg/cm2
Peak flux PL 2.34e+00 1.55e+00 6.66e-01 3.93e-01 4.75e+00 4.95e+00 ph/cm2/s
90%_error_low -1.99e-01 -9.32e-02 -6.54e-02 -6.81e-02 -2.92e-01 -2.98e-01 ph/cm2/s
90%_error_hi 2.02e-01 9.32e-02 6.60e-02 7.62e-02 2.92e-01 2.98e-01 ph/cm2/s
Fluence CPL 4.24e-07 4.70e-07 2.44e-07 5.82e-08 1.18e-06 1.20e-06 erg/cm2
90%_error_low -3.32e-08 -2.33e-08 -3.27e-08 -2.82e-08 -6.74e-08 -7.48e-08 erg/cm2
90%_error_hi 3.34e-08 2.35e-08 3.17e-08 4.83e-08 7.01e-08 8.86e-08 erg/cm2
Peak flux CPL 2.11e+00 1.75e+00 6.31e-01 9.65e-02 4.58e+00 4.59e+00 ph/cm2/s
90%_error_low -2.27e-01 -1.31e-01 -8.63e-02 -4.91e-02 -3.01e-01 -3.07e-01 ph/cm2/s
90%_error_hi 2.29e-01 1.34e-01 8.11e-02 8.37e-02 3.01e-01 3.10e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 296.5992 -39.4013 0.0045 14.7145 83.8958 2.6703249 42.786 TRIG_01042398 Foreground time interval of the image: -0.448 11.597 (delta_t = 12.045 [sec]) Background time interval of the image: -145.803 -0.448 (delta_t = 145.355 [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 -0.448 sec. to 14.440 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.61464 ( -0.0928269 0.0907473 ) Norm@50keV : 8.45571E-03 ( -0.000496315 0.000493648 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 73.23 using 59 bins. Reduced chi-squared = 1.28474 # Null hypothesis probability of 7.25e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 14.89 sec: 1.78525 ( -0.07893 0.07927 ) ph/cm2/s Energy fluence (15-150 keV) : 1.30225e-06 ( -5.57441e-08 5.59833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 14.440 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.61872 ( -0.453431 0.503209 ) Epeak [keV] : 14.3636 ( -13.4918 8.01361 ) Norm@50keV : 3.36059E-02 ( -0.0143037 0.0341496 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.45 using 59 bins. Reduced chi-squared = 1.00804 # Null hypothesis probability of 4.58e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 14.89 sec: 1.68491 ( -0.0887 0.08896 ) ph/cm2/s Energy fluence (15-150 keV) : 1.18463e-06 ( -6.74253e-08 7.00789e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.868 sec. to 4.868 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21733 ( -0.111359 0.107825 ) Norm@50keV : 2.84293E-02 ( -0.00216059 0.002137 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 87.45 using 59 bins. Reduced chi-squared = 1.53421 # Null hypothesis probability of 5.86e-03 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 4.75037 ( -0.29169 0.29195 ) ph/cm2/s Energy fluence (15-150 keV) : 2.68022e-07 ( -1.78838e-08 1.80135e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.868 sec. to 4.868 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.04672 ( -0.549181 0.635506 ) Epeak [keV] : 32.6366 ( -7.91486 4.83152 ) Norm@50keV : 0.139500 ( -0.0729389 0.19537 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 72.16 using 59 bins. Reduced chi-squared = 1.28857 # Null hypothesis probability of 7.18e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 4.57746 ( -0.3009 0.30132 ) ph/cm2/s Energy fluence (15-150 keV) : 2.44861e-07 ( -1.93073e-08 1.99646e-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 = 2.792549792731256E-02, IMY = -2.611258187836020E-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: -145.803400 -0.448000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.7985 -44.5838 5.0 38.7 79.1 1.4220 2.3 8.4 4U 1735-44 270.1625 -25.1094 22.7 38.7 111.3 0.3169 0.5 6.9 GX 5-1 270.1984 -25.6869 16.4 38.4 110.5 0.4159 0.7 6.6 GRS 1758-258 274.0814 -14.1300 6.4 41.0 129.0 1.1282 1.8 7.1 GX 17+2 275.9298 -30.3682 20.9 32.1 105.9 0.1809 0.6 0.3 H1820-303 285.1929 -24.8435 4.5 26.5 122.7 0.6721 2.6 9.7 HT1900.1-2455 288.9056 10.8947 8.3 50.9 167.6 -0.9036 -1.4 7.0 GRS 1915+105 286.2300 -15.8953 2.7 30.8 139.3 1.0860 4.2 ------ UNKNOWN 338.2790 0.2707 2.2 41.4 -121.4 2.4352 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.448000 11.596600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.8125 -44.4430 6.4 38.7 79.3 -0.3943 -1.8 3.0 4U 1735-44 270.1039 -25.2085 0.0 38.7 111.1 -0.1115 -0.6 12.5 GX 5-1 270.2611 -25.6817 7.8 38.4 110.5 0.2738 1.5 4.3 GRS 1758-258 274.0243 -13.9064 48.5 41.2 129.3 -0.0459 -0.2 7.9 GX 17+2 276.0809 -30.4921 6.0 31.9 105.7 0.1862 1.9 11.0 H1820-303 285.0918 -24.9960 12.5 26.5 122.3 0.0715 0.9 5.5 HT1900.1-2455 288.8907 11.0069 19.8 51.0 167.6 0.1081 0.6 6.6 GRS 1915+105 296.5992 -39.4012 0.3 14.7 83.9 2.6702 42.7 ------ UNKNOWN 294.8363 2.2326 2.6 40.5 169.8 0.3944 4.4 ------ UNKNOWN 304.7438 -17.7536 2.2 18.3 171.2 0.2742 5.2 ------ UNKNOWN 317.3815 -34.9172 2.1 3.0 -54.7 0.2702 5.4 ------ UNKNOWN 7.8418 -60.1729 2.4 43.2 -16.2 0.4362 4.8 ------ UNKNOWN 313.7814 22.1746 2.7 56.3 -160.3 0.8431 4.2 ------ UNKNOWN 5.0241 -27.9441 2.8 43.9 -63.8 0.8745 4.2 ------ UNKNOWN 6.9791 -29.6692 2.5 44.9 -60.7 1.0159 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 47.196580 962.775900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9703 -37.8506 1.1 31.5 90.5 16.5455 10.6 0.9 4U 1700-377 256.4673 -36.4320 5.3 31.5 93.3 3.1131 2.2 1.6 GX 349+2 262.9370 -24.7536 10.3 31.8 118.1 2.1008 1.1 4.0 GX 1+4 264.5627 -44.4526 4.0 24.2 78.3 3.3957 2.9 7.7 4U 1735-44 268.2405 -1.5001 24.4 45.8 149.4 1.4778 0.5 8.2 SW J1753.5-0127 270.2744 -25.1172 6.2 26.3 125.8 2.3172 1.8 2.3 GX 5-1 270.4816 -25.6048 0.0 25.8 125.2 2.3277 1.9 12.8 GRS 1758-258 274.0691 -13.9779 4.0 32.2 146.6 3.6750 2.9 5.1 GX 17+2 275.8840 -30.4194 6.1 19.1 122.4 1.9850 1.9 3.8 H1820-303 284.8678 -24.7896 6.6 17.6 153.3 -1.7213 -1.8 12.1 HT1900.1-2455 288.7159 10.8818 10.2 50.8 -179.2 2.7886 1.1 6.2 GRS 1915+105 262.9207 -33.9618 13.7 27.4 101.6 1.1856 0.8 8.4 GX 354-0 171.3123 -84.0918 2.7 54.2 16.8 19.1635 4.4 ------ UNKNOWN 276.0493 -61.6058 3.7 25.5 33.6 3.2639 3.1 ------ UNKNOWN 325.1363 0.7632 3.0 47.9 -129.1 17.2511 3.9 ------ UNKNOWN 328.5247 -4.4334 3.2 45.3 -121.3 13.0145 3.6 ------ UNKNOWN