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 Jun 14 15:08:07 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1161390
======================================================================
Trigger: 01161390 Segment: 000
BAT Trigger Time: 701406966.848 [s; MET]
Trigger Stop: 701406967.872 [s; MET]
UTC: 2023-03-25T03:15:35.863840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 296.820236138275 Dec: -46.0941325282463 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.62
Image Trigger?: NO
Rate S/N Ratio: 29.086079144498 [ if not an image trigger ]
Image S/N Ratio: 11.62
Analysis Position: [ source = BAT ]
RA: 296.820236138275 Dec: -46.0941325282463 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 296.857024926155 Dec: -46.0707340759418 [deg; J2000]
{ 19h 47m 25.7s , -46d 04' 14.6" }
+/- 1.5568128472591 [arcmin] (estimated 90% radius based on SNR)
+/- 0.558808453447805 [arcmin] (formal 1-sigma fit error)
SNR: 16.1619940153994
Angular difference between the analysis and refined position is 2.077276 arcmin
Partial Coding Fraction: 0.4882812 [ including projection effects ]
Duration
T90: 38.2880001068115 +/- 11.3418334203591
Measured from: -7.22400009632111
to: 31.0640000104904 [s; relative to TRIGTIME]
T50: 6.04800009727478 +/- 7.18016826971619
Measured from: -0.168000102043152
to: 5.87999999523163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0680000782012939
to: 0.931999921798706 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.55200004577637
to: 41.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.736410 0.905709 0.570368 0.101465
0.076035 0.077711 0.067597 0.058154 [error]
Peak 0.100025 0.146943 0.144738 0.031913
0.013842 0.015027 0.014572 0.009694 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 50.256 -8.552 41.704
T90 38.288 -7.224 31.064
T50 6.048 -0.168 5.880
Peak 1.000 -0.068 0.932
====== 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 -1.813 -0.185 0.178 - - - 2.84e-03 -3.25e-04 3.19e-04 43.720 57
CPL -1.405 -0.670 0.742 67.022 -19.647 -67.022 4.72e-03 -1.86e-03 6.97e-03 42.570 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 -1.319 -0.177 0.176 - - - 2.77e-02 -2.97e-03 2.96e-03 56.720 57
CPL -0.861 -0.543 0.786 136.821 -55.761 -136.821 4.56e-02 -1.98e-02 5.81e-02 55.420 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 2.45e-07 3.72e-07 4.23e-07 9.18e-07 1.31e-06 1.96e-06 erg/cm2
90%_error_low -3.61e-08 -3.64e-08 -6.54e-08 -2.60e-07 -1.51e-07 -3.30e-07 erg/cm2
90%_error_hi 3.73e-08 3.64e-08 6.58e-08 3.21e-07 1.53e-07 3.78e-07 erg/cm2
Peak flux PL 9.59e-01 1.07e+00 8.62e-01 1.15e+00 3.32e+00 4.04e+00 ph/cm2/s
90%_error_low -1.77e-01 -1.29e-01 -1.10e-01 -2.74e-01 -3.62e-01 -4.45e-01 ph/cm2/s
90%_error_hi 1.87e-01 1.27e-01 1.09e-01 3.18e-01 3.62e-01 4.49e-01 ph/cm2/s
Fluence CPL 2.32e-07 3.89e-07 4.26e-07 4.81e-07 1.27e-06 1.53e-06 erg/cm2
90%_error_low -4.16e-08 -3.82e-08 -6.99e-08 -2.96e-07 -1.65e-07 -3.48e-07 erg/cm2
90%_error_hi 4.19e-08 4.71e-08 7.02e-08 5.30e-07 1.68e-07 5.80e-07 erg/cm2
Peak flux CPL 8.67e-01 1.12e+00 9.13e-01 7.44e-01 3.27e+00 3.64e+00 ph/cm2/s
90%_error_low -2.19e-01 -1.44e-01 -1.33e-01 -3.49e-01 -3.69e-01 -5.28e-01 ph/cm2/s
90%_error_hi 2.28e-01 1.48e-01 1.38e-01 5.18e-01 3.68e-01 6.74e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 296.8570 -46.0707 0.0119 30.2234 108.6637 1.8526862 16.162 TRIG_01161390 Foreground time interval of the image: -8.552 15.053 (delta_t = 23.605 [sec]) Background time interval of the image: -239.848 -8.552 (delta_t = 231.296 [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 -8.552 sec. to 41.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81321 ( -0.184893 0.177818 ) Norm@50keV : 2.83835E-03 ( -0.000324843 0.000318725 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.72 using 59 bins. Reduced chi-squared = 0.767018 # Null hypothesis probability of 9.02e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 50.26 sec: 0.393161 ( -0.038906 0.038932 ) ph/cm2/s Energy fluence (15-150 keV) : 1.31293e-06 ( -1.51102e-07 1.53401e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.552 sec. to 41.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40523 ( -0.669905 0.742023 ) Epeak [keV] : 67.0219 ( -19.6458 -67.0203 ) Norm@50keV : 4.71607E-03 ( -0.00186206 0.00696988 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 42.57 using 59 bins. Reduced chi-squared = 0.760179 # Null hypothesis probability of 9.07e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 50.26 sec: 0.386332 ( -0.040362 0.040349 ) ph/cm2/s Energy fluence (15-150 keV) : 1.26804e-06 ( -1.64793e-07 1.68119e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.068 sec. to 0.932 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3188 ( -0.177109 0.175747 ) Norm@50keV : 2.77147E-02 ( -0.00297003 0.00296409 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.72 using 59 bins. Reduced chi-squared = 0.995088 # Null hypothesis probability of 4.85e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 3.31820 ( -0.36172 0.36214 ) ph/cm2/s Energy fluence (15-150 keV) : 2.72672e-07 ( -3.21914e-08 3.23422e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.068 sec. to 0.932 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.861265 ( -0.543093 0.786155 ) Epeak [keV] : 136.821 ( -55.76 -136.82 ) Norm@50keV : 4.55892E-02 ( -0.0198296 0.0580951 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.42 using 59 bins. Reduced chi-squared = 0.989643 # Null hypothesis probability of 4.97e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 3.27346 ( -0.36879 0.36841 ) ph/cm2/s Energy fluence (15-150 keV) : 1.05604e-07 ( -3.64082e-08 3.28578e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 38.288 sec. Hardness ratio (energy fluence ratio) = 1.13825618144
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.161121e-07 S(50-150 keV) = 6.968228e-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 = -1.864270239209484E-01, IMY = -5.519256895322276E-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: -239.848000 -8.552000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.1672 -24.7972 7.9 46.1 136.8 2.7676 1.5 10.3 HT1900.1-2455 334.2822 -49.5677 2.5 10.1 57.0 1.5468 4.6 ------ UNKNOWN 357.1847 -5.5316 3.4 38.5 -103.4 3.6562 3.4 372.3 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.552000 15.052600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.0409 -24.8904 32.1 46.2 136.6 -0.1263 -0.4 1.8 HT1900.1-2455 296.8571 -46.0707 0.7 30.2 108.7 1.8522 16.2 ------ UNKNOWN 60.7702 -62.7785 2.7 52.3 9.4 0.9134 4.3 ------ UNKNOWN 45.2796 -32.4049 2.1 53.8 -30.8 2.4946 5.6 ------ UNKNOWN 37.1089 -26.2237 2.5 50.7 -42.1 1.7404 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 82.252590 539.952600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.1383 -37.9903 0.0 30.9 108.8 -1.4767 -1.3 11.3 4U 1700-377 256.4387 -36.4208 86.0 31.5 111.6 -0.1587 -0.1 0.2 GX 349+2 262.9229 -24.8750 98.8 34.4 134.7 -0.1498 -0.1 9.1 GX 1+4 264.7041 -44.4638 25.1 22.5 100.8 -0.4799 -0.5 1.9 4U 1735-44 268.2528 -1.6269 0.0 51.0 160.4 -3.5154 -0.9 12.5 SW J1753.5-0127 270.2371 -24.9464 6.7 30.0 144.0 1.6666 1.7 8.4 GX 5-1 270.1484 -25.7690 3.9 29.4 142.9 2.9412 3.0 8.5 GRS 1758-258 274.0887 -13.9420 5.7 37.4 160.2 -2.5405 -2.0 7.4 GX 17+2 275.8460 -30.5232 27.8 22.5 144.7 0.3360 0.4 10.2 H1820-303 285.0489 -24.7949 5.9 23.3 170.4 -1.5264 -1.9 7.6 HT1900.1-2455 263.0017 -33.9720 4.6 28.3 121.6 2.5121 2.5 8.3 GX 354-0 268.3150 -34.6113 2.4 24.4 126.3 4.2967 4.8 ------ UNKNOWN