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 Sep 29 23:41:34 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1176135
======================================================================
Trigger: 01176135 Segment: 000
BAT Trigger Time: 709121092.8 [s; MET]
Trigger Stop: 709121093.312 [s; MET]
UTC: 2023-06-22T10:04:21.289560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 292.532303762044 Dec: -32.9215292302855 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: NO
Rate S/N Ratio: 15.0996688705415 [ if not an image trigger ]
Image S/N Ratio: 7.44
Analysis Position: [ source = BAT ]
RA: 292.532303762044 Dec: -32.9215292302855 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 292.502760160136 Dec: -32.9803340829587 [deg; J2000]
{ 19h 30m 00.7s , -32d 58' 49.2" }
+/- 2.15640907849766 [arcmin] (estimated 90% radius based on SNR)
+/- 1.06812416062953 [arcmin] (formal 1-sigma fit error)
SNR: 10.1475124322736
Angular difference between the analysis and refined position is 3.829020 arcmin
Partial Coding Fraction: 0.3085938 [ including projection effects ]
Duration
T90: 23.5519998073578 +/- 17.7298482053297
Measured from: 0.160000085830688
to: 23.7119998931885 [s; relative to TRIGTIME]
T50: 13.1839998960495 +/- 12.0682432974597
Measured from: 0.544000029563904
to: 13.7279999256134 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0760000944137573
to: 1.07600009441376 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.031999945640564
to: 24.1600000858307 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.500068 0.265982 0.119510 0.082973
0.059994 0.061444 0.052107 0.049503 [error]
Peak 0.121938 0.134785 0.062735 0.018784
0.015348 0.016747 0.013148 0.010648 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 24.192 -0.032 24.160
T90 23.552 0.160 23.712
T50 13.184 0.544 13.728
Peak 1.000 0.076 1.076
====== 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 -2.547 -0.459 0.386 - - - 1.69e-03 -5.61e-04 5.66e-04 62.330 57
CPL -1.919 N/A N/A 4.254 N/A N/A 4.42e-03 N/A N/A 61.950 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 -2.129 -0.256 0.234 - - - 1.74e-02 -3.26e-03 3.18e-03 48.250 57
CPL -0.666 -1.072 1.355 37.436 -9.253 10.523 1.27e-01 -1.27e-01 6.87e-01 42.460 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 1.41e-07 1.38e-07 9.42e-08 1.01e-07 4.13e-07 4.74e-07 erg/cm2
90%_error_low -2.98e-08 -3.17e-08 -3.93e-08 -6.19e-08 -9.76e-08 -1.33e-07 erg/cm2
90%_error_hi 3.00e-08 3.03e-08 4.57e-08 1.10e-07 1.05e-07 1.70e-07 erg/cm2
Peak flux PL 1.32e+00 9.15e-01 4.19e-01 2.67e-01 2.78e+00 2.92e+00 ph/cm2/s
90%_error_low -2.36e-01 -1.31e-01 -9.85e-02 -1.01e-01 -3.90e-01 -4.13e-01 ph/cm2/s
90%_error_hi 2.42e-01 1.30e-01 1.01e-01 1.29e-01 3.90e-01 4.14e-01 ph/cm2/s
Fluence CPL 1.40e-07 1.46e-07 8.04e-08 2.61e-08 3.86e-07 3.94e-07 erg/cm2
90%_error_low -2.79e-08 -3.30e-08 -5.92e-08 -2.27e-08 -1.03e-07 -1.11e-07 erg/cm2
90%_error_hi 3.00e-08 3.97e-08 5.41e-08 1.07e-07 1.11e-07 1.63e-07 erg/cm2
Peak flux CPL 1.17e+00 1.10e+00 4.14e-01 5.49e-02 2.73e+00 2.74e+00 ph/cm2/s
90%_error_low -2.72e-01 -1.85e-01 -1.28e-01 -5.49e-02 -3.89e-01 -3.93e-01 ph/cm2/s
90%_error_hi 2.71e-01 1.92e-01 1.23e-01 1.18e-01 3.90e-01 3.96e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 292.5028 -32.9803 0.0189 31.9015 77.1033 0.7647154 10.148 TRIG_01176135 Foreground time interval of the image: -0.032 9.101 (delta_t = 9.133 [sec]) Background time interval of the image: -368.800 -278.688 (delta_t = 90.112 [sec]) -239.800 -0.032 (delta_t = 239.768 [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 -0.032 sec. to 24.160 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.54707 ( -0.458662 0.385614 ) Norm@50keV : 1.68585E-03 ( -0.000561454 0.000566093 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 62.33 using 59 bins. Reduced chi-squared = 1.09351 # Null hypothesis probability of 2.92e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 24.19 sec: 0.341014 ( -0.062321 0.062389 ) ph/cm2/s Energy fluence (15-150 keV) : 4.13272e-07 ( -9.75851e-08 1.04664e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 24.160 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.9192 ( ) Epeak [keV] : 4.25402 ( ) Norm@50keV : 4.42107E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 61.95 using 59 bins. Reduced chi-squared = 1.10625 # Null hypothesis probability of 2.72e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 24.19 sec: 0.336717 ( -0.062465 0.061851 ) ph/cm2/s Energy fluence (15-150 keV) : 3.8608e-07 ( -1.03282e-07 1.11492e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.076 sec. to 1.076 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12881 ( -0.256458 0.23367 ) Norm@50keV : 1.74103E-02 ( -0.00326116 0.00317836 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 48.25 using 59 bins. Reduced chi-squared = 0.846491 # Null hypothesis probability of 7.89e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.77893 ( -0.38986 0.38987 ) ph/cm2/s Energy fluence (15-150 keV) : 1.62271e-07 ( -2.70575e-08 2.76268e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 1.076 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.665665 ( -1.07231 1.35465 ) Epeak [keV] : 37.4362 ( -9.25337 10.5231 ) Norm@50keV : 0.126558 ( -0.126562 0.686918 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 42.46 using 59 bins. Reduced chi-squared = 0.758214 # Null hypothesis probability of 9.09e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.73345 ( -0.38878 0.38951 ) ph/cm2/s Energy fluence (15-150 keV) : 1.50546e-07 ( -2.5888e-08 2.76837e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 23.552 sec. Hardness ratio (energy fluence ratio) = 0.684462975457
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.783755e-07 S(50-150 keV) = 1.3490337e-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 = 1.389340615369184E-01, IMY = -6.067783706846753E-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: -368.800000 -278.688000 -239.800000 -0.032000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 293.7393 -29.1468 2.4 31.6 84.6 5.0752 4.8 ------ UNKNOWN 330.2348 15.3056 2.7 47.1 179.2 5.9647 4.2 ------ UNKNOWN 333.9901 -10.9167 3.2 21.2 -170.8 1.9743 3.6 ------ UNKNOWN 33.4781 -77.1283 3.0 53.1 -14.8 4.7478 3.8 ------ UNKNOWN 2.2548 -52.4314 2.5 30.9 -39.2 3.2475 4.7 ------ UNKNOWN 25.5539 -41.8737 2.5 44.4 -61.2 12.4095 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.032000 9.100600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 271.2239 -50.3311 2.6 46.9 48.2 0.8513 4.4 ------ UNKNOWN 292.5027 -32.9803 1.1 31.9 77.1 0.7646 10.1 ------ UNKNOWN 285.9251 -46.9139 2.7 37.0 52.3 0.3676 4.3 ------ UNKNOWN 326.9779 -14.8374 2.3 17.3 168.1 0.1844 5.0 ------ UNKNOWN 16.9938 -56.6907 2.4 40.4 -38.4 0.3097 4.7 ------ UNKNOWN 31.7771 -59.8135 2.2 48.6 -36.4 0.5277 5.2 ------ UNKNOWN 20.4592 -33.2625 2.2 41.8 -74.5 0.7807 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 151.900620 165.500590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 84.4882 -13.7185 2.5 43.0 -50.9 0.5631 4.6 ------ UNKNOWN 81.1664 17.7423 2.2 41.2 -98.8 1.0130 5.3 ------ UNKNOWN