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 23:17:48 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1047531
======================================================================
Trigger: 01047531 Segment: 000
BAT Trigger Time: 642263567.424 [s; MET]
Trigger Stop: 642263568.448 [s; MET]
UTC: 2021-05-09T14:32:20.436060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.352300001742 Dec: 6.67546089388726 [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: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 8.09
Analysis Position: [ source = BAT ]
RA: 350.352300001742 Dec: 6.67546089388726 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 350.367813701445 Dec: 6.6467696170631 [deg; J2000]
{ 23h 21m 28.3s , +06d 38' 48.4" }
+/- 1.40323404027547 [arcmin] (estimated 90% radius based on SNR)
+/- 0.512558511716336 [arcmin] (formal 1-sigma fit error)
SNR: 18.7470313858947
Angular difference between the analysis and refined position is 1.954035 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 10.8159999847412 +/- 1.4402000719477
Measured from: -3.71200001239777
to: 7.10399997234344 [s; relative to TRIGTIME]
T50: 4.67200005054474 +/- 1.12785818358311
Measured from: -0.25600004196167
to: 4.41600000858307 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.25199997425079
to: 4.25199997425079 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.68800008296967
to: 7.66400003433228 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.330601 0.330923 0.138797 0.017729
0.024555 0.025261 0.021610 0.018335 [error]
Peak 0.048972 0.056051 0.041816 -0.002667
0.007459 0.007676 0.006681 0.005040 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 12.352 -4.688 7.664
T90 10.816 -3.712 7.104
T50 4.672 -0.256 4.416
Peak 1.000 3.252 4.252
====== 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 -2.120 -0.174 0.166 - - - 3.61e-03 -4.37e-04 4.30e-04 57.720 57
CPL -0.806 -0.824 0.993 35.285 -9.479 7.058 2.22e-02 -2.22e-02 6.75e-02 49.590 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 -1.825 -0.256 0.239 - - - 8.40e-03 -1.51e-03 1.48e-03 57.620 57
CPL 0.207 -1.190 1.525 48.270 -8.348 12.687 1.11e-01 -1.11e-01 6.25e-01 47.980 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 1.02e-07 1.29e-07 1.19e-07 1.91e-07 4.16e-07 5.42e-07 erg/cm2
90%_error_low -1.21e-08 -1.18e-08 -1.92e-08 -5.40e-08 -4.46e-08 -7.92e-08 erg/cm2
90%_error_hi 1.24e-08 1.18e-08 1.98e-08 6.68e-08 4.56e-08 8.87e-08 erg/cm2
Peak flux PL 4.73e-01 3.93e-01 2.22e-01 1.85e-01 1.17e+00 1.27e+00 ph/cm2/s
90%_error_low -9.73e-02 -5.99e-02 -4.99e-02 -6.82e-02 -1.78e-01 -1.97e-01 ph/cm2/s
90%_error_hi 1.01e-01 5.99e-02 5.07e-02 8.73e-02 1.78e-01 1.99e-01 ph/cm2/s
Fluence CPL 9.37e-08 1.49e-07 1.04e-07 2.65e-08 3.68e-07 3.73e-07 erg/cm2
90%_error_low -1.38e-08 -1.67e-08 -2.60e-08 -1.87e-08 -4.52e-08 -4.92e-08 erg/cm2
90%_error_hi 1.38e-08 1.71e-08 2.50e-08 5.50e-08 5.02e-08 7.19e-08 erg/cm2
Peak flux CPL 3.70e-01 4.90e-01 2.35e-01 3.01e-02 1.12e+00 1.12e+00 ph/cm2/s
90%_error_low -1.18e-01 -8.12e-02 -6.42e-02 -3.01e-02 -1.78e-01 -1.80e-01 ph/cm2/s
90%_error_hi 1.20e-01 8.40e-02 6.40e-02 5.30e-02 1.79e-01 1.82e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 350.3678 6.6468 0.0102 23.0035 -167.3340 0.8672042 18.747 TRIG_01047531 Foreground time interval of the image: -4.688 7.664 (delta_t = 12.352 [sec]) Background time interval of the image: -239.424 -4.688 (delta_t = 234.736 [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 -4.688 sec. to 7.664 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12031 ( -0.174419 0.16559 ) Norm@50keV : 3.61394E-03 ( -0.000436793 0.000429941 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.72 using 59 bins. Reduced chi-squared = 1.01263 # Null hypothesis probability of 4.48e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 12.35 sec: 0.574385 ( -0.051001 0.051006 ) ph/cm2/s Energy fluence (15-150 keV) : 4.15611e-07 ( -4.45826e-08 4.56079e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.688 sec. to 7.664 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.806357 ( -0.824142 0.992605 ) Epeak [keV] : 35.2855 ( -9.4787 7.05829 ) Norm@50keV : 2.22484E-02 ( -0.0222484 0.0674802 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.59 using 59 bins. Reduced chi-squared = 0.885536 # Null hypothesis probability of 7.15e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 12.35 sec: 0.549856 ( -0.052245 0.05255 ) ph/cm2/s Energy fluence (15-150 keV) : 3.67508e-07 ( -4.51507e-08 5.01756e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.252 sec. to 4.252 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.82517 ( -0.256173 0.239395 ) Norm@50keV : 8.39898E-03 ( -0.00151116 0.00148262 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.62 using 59 bins. Reduced chi-squared = 1.01088 # Null hypothesis probability of 4.52e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.16892 ( -0.178257 0.17828 ) ph/cm2/s Energy fluence (15-150 keV) : 7.72681e-08 ( -1.3811e-08 1.41432e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.252 sec. to 4.252 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.20696 ( -1.19473 1.52084 ) Epeak [keV] : 48.2699 ( -8.32959 12.7054 ) Norm@50keV : 0.111190 ( -0.111818 0.623876 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.98 using 59 bins. Reduced chi-squared = 0.856786 # Null hypothesis probability of 7.68e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.12059 ( -0.177783 0.17874 ) ph/cm2/s Energy fluence (15-150 keV) : 6.95537e-08 ( -1.2595e-08 1.36955e-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 = -4.142163713626277E-01, IMY = 9.308937244723164E-02
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: -239.424000 -4.688000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 315.3025 0.1834 2.6 47.9 145.2 4.3176 4.4 ------ UNKNOWN 25.3640 -40.6478 2.6 34.2 9.6 1.3894 4.5 ------ UNKNOWN 54.0112 -40.8601 4.2 53.0 -6.1 1.6753 2.8 ------ UNKNOWN 57.5569 -39.7481 3.2 55.4 -8.2 2.8788 3.6 ------ UNKNOWN 59.1265 -34.2457 3.3 55.7 -15.0 3.3844 3.5 ------ UNKNOWN 23.2752 1.8202 3.5 26.3 -81.3 1.0607 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.688000 7.664000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 333.0582 -42.6233 2.2 38.2 77.2 0.8037 5.2 ------ UNKNOWN 336.8321 3.2410 2.2 29.7 164.9 0.2881 5.2 ------ UNKNOWN 350.3678 6.6468 0.6 23.0 -167.3 0.8671 18.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 200.876600 308.476600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6561 -40.5827 6.3 42.3 156.5 0.5901 1.8 6.1 Vela X-1 167.7489 6.8593 3.2 35.0 59.8 1.1012 3.6 ------ UNKNOWN