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: Sat Jul 30 00:31:11 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1015919
======================================================================
Trigger: 01015919 Segment: 000
BAT Trigger Time: 631487437.12 [s; MET]
Trigger Stop: 631487438.144 [s; MET]
UTC: 2021-01-04T21:10:10.846460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 53.6011737701449 Dec: 37.9308387655033 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 11.5325625946708 [ if not an image trigger ]
Image S/N Ratio: 7.88
Analysis Position: [ source = BAT ]
RA: 53.6011737701449 Dec: 37.9308387655033 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 53.5615447871282 Dec: 37.9486321886368 [deg; J2000]
{ 03h 34m 14.8s , +37d 56' 55.1" }
+/- 1.57761719479648 [arcmin] (estimated 90% radius based on SNR)
+/- 0.545469646542714 [arcmin] (formal 1-sigma fit error)
SNR: 15.8583831676958
Angular difference between the analysis and refined position is 2.157832 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 19.944000005722 +/- 2.39839021478798
Measured from: 0.371999979019165
to: 20.3159999847412 [s; relative to TRIGTIME]
T50: 7.63199996948242 +/- 3.4077329369124
Measured from: 6.42799997329712
to: 14.0599999427795 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.8320000171661
to: 11.8320000171661 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.148000001907349
to: 22.7639999389648 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.744909 0.781686 0.503680 0.084162
0.047175 0.049069 0.043959 0.042007 [error]
Peak 0.069112 0.082681 0.061705 0.008709
0.010705 0.011577 0.009718 0.008867 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 22.912 -0.148 22.764
T90 19.944 0.372 20.316
T50 7.632 6.428 14.060
Peak 1.000 10.832 11.832
====== 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 -1.834 -0.141 0.137 - - - 5.60e-03 -4.66e-04 4.59e-04 55.120 57
CPL -1.778 -0.497 0.531 179.309 -129.779 -179.309 6.01e-03 -2.28e-03 5.51e-03 55.080 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 -1.740 -0.255 0.244 - - - 1.39e-02 -2.29e-03 2.24e-03 34.770 57
CPL -1.238 -0.883 1.132 67.252 -54.732 -67.252 2.66e-02 -2.66e-02 8.73e-02 33.950 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 2.24e-07 3.36e-07 3.77e-07 8.03e-07 1.18e-06 1.74e-06 erg/cm2
90%_error_low -2.48e-08 -2.36e-08 -4.36e-08 -1.77e-07 -9.84e-08 -2.21e-07 erg/cm2
90%_error_hi 2.55e-08 2.36e-08 4.39e-08 2.09e-07 9.98e-08 2.46e-07 erg/cm2
Peak flux PL 7.21e-01 6.29e-01 3.77e-01 3.40e-01 1.87e+00 2.07e+00 ph/cm2/s
90%_error_low -1.50e-01 -9.00e-02 -7.96e-02 -1.22e-01 -2.67e-01 -3.00e-01 ph/cm2/s
90%_error_hi 1.56e-01 8.98e-02 7.98e-02 1.57e-01 2.67e-01 3.02e-01 ph/cm2/s
Fluence CPL 2.23e-07 3.38e-07 3.78e-07 7.23e-07 1.17e-06 1.66e-06 erg/cm2
90%_error_low -2.85e-08 -2.55e-08 -4.42e-08 -4.19e-07 -1.16e-07 -4.41e-07 erg/cm2
90%_error_hi 2.79e-08 2.99e-08 4.40e-08 1.15e-07 1.05e-07 4.60e-07 erg/cm2
Peak flux CPL 6.83e-01 6.70e-01 3.83e-01 1.77e-01 1.85e+00 1.91e+00 ph/cm2/s
90%_error_low -1.70e-01 -1.13e-01 -8.73e-02 -1.77e-01 -2.72e-01 -3.11e-01 ph/cm2/s
90%_error_hi 1.71e-01 1.22e-01 8.71e-02 2.08e-01 2.72e-01 3.68e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 53.5615 37.9486 0.0122 25.7252 -108.9616 1.1051554 15.858 TRIG_01015919 Foreground time interval of the image: -0.148 11.381 (delta_t = 11.529 [sec]) Background time interval of the image: -239.120 -0.148 (delta_t = 238.972 [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 -0.148 sec. to 22.764 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83384 ( -0.141038 0.13723 ) Norm@50keV : 5.59898E-03 ( -0.00046601 0.00045856 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.12 using 59 bins. Reduced chi-squared = 0.967018 # Null hypothesis probability of 5.46e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 22.91 sec: 0.781925 ( -0.055599 0.055668 ) ph/cm2/s Energy fluence (15-150 keV) : 1.17995e-06 ( -9.83584e-08 9.98251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 22.764 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77767 ( -0.497468 0.53141 ) Epeak [keV] : 179.309 ( -129.808 -179.337 ) Norm@50keV : 6.00710E-03 ( -0.0022793 0.00551084 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.08 using 59 bins. Reduced chi-squared = 0.983571 # Null hypothesis probability of 5.10e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 22.91 sec: 0.779489 ( -0.059374 0.057605 ) ph/cm2/s Energy fluence (15-150 keV) : 1.17275e-06 ( -1.15798e-07 1.0544e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 10.832 sec. to 11.832 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.73958 ( -0.255462 0.243651 ) Norm@50keV : 1.39035E-02 ( -0.00229202 0.0022371 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 34.77 using 59 bins. Reduced chi-squared = 0.61 # Null hypothesis probability of 9.91e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.87290 ( -0.26689 0.26695 ) ph/cm2/s Energy fluence (15-150 keV) : 1.28396e-07 ( -2.1643e-08 2.20844e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.832 sec. to 11.832 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23818 ( -0.882495 1.13246 ) Epeak [keV] : 67.2517 ( -54.733 -67.2526 ) Norm@50keV : 2.65635E-02 ( -0.026563 0.0872649 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 33.95 using 59 bins. Reduced chi-squared = 0.60625 # Null hypothesis probability of 9.91e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.84501 ( -0.27192 0.27193 ) ph/cm2/s Energy fluence (15-150 keV) : 1.22535e-07 ( -2.36e-08 2.45235e-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 = -1.565562409960690E-01, IMY = 4.556650039485672E-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: -239.120000 -0.148000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6341 22.0055 0.4 9.9 141.8 9.2685 26.7 0.5 Crab 120.3684 14.1168 2.3 37.5 68.6 4.0325 5.0 ------ UNKNOWN 147.9431 55.4088 2.3 49.6 0.7 3.1285 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.148000 11.380600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.4729 21.9574 7.0 9.9 142.7 0.0836 1.7 9.6 Crab 48.8956 -12.5655 2.6 55.8 -178.2 0.9110 4.4 ------ UNKNOWN 53.5615 37.9486 0.7 25.7 -109.0 1.1048 15.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 64.380600 752.080600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6561 22.0217 0.5 30.3 109.9 27.7541 21.8 1.3 Crab 72.1922 16.5759 2.8 26.9 134.4 4.5671 4.1 ------ UNKNOWN 307.2871 77.3895 3.3 56.5 -17.7 9.3773 3.5 ------ UNKNOWN 5.6034 28.4166 3.8 40.8 -92.0 12.6842 3.1 ------ UNKNOWN 16.4857 3.9104 2.3 48.0 -129.0 17.9718 4.9 ------ UNKNOWN