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 Oct 19 23:37:55 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger997453
======================================================================
Trigger: 00997453 Segment: 000
BAT Trigger Time: 622763462.72 [s; MET]
Trigger Stop: 622763463.744 [s; MET]
UTC: 2020-09-25T21:50:37.022000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 246.851224404343 Dec: 78.3941848869908 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 7.68
Analysis Position: [ source = BAT ]
RA: 246.851224404343 Dec: 78.3941848869908 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 246.897706429357 Dec: 78.394871204034 [deg; J2000]
{ 16h 27m 35.4s , +78d 23' 41.5" }
+/- 1.21647069658082 [arcmin] (estimated 90% radius based on SNR)
+/- 0.409395088796566 [arcmin] (formal 1-sigma fit error)
SNR: 22.9902975332466
Angular difference between the analysis and refined position is 0.562561 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 18.8039999008179 +/- 1.47851957461597
Measured from: 0.667999982833862
to: 19.4719998836517 [s; relative to TRIGTIME]
T50: 4.30400002002716 +/- 2.04986052305482
Measured from: 2.99599993228912
to: 7.29999995231628 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.38399994373322
to: 5.38399994373322 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.199999928474426
to: 20.9319999217987 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.697108 0.741469 0.392039 0.051799
0.044433 0.045855 0.039774 0.035319 [error]
Peak 0.133394 0.119752 0.080696 0.001831
0.011463 0.012541 0.010521 0.008401 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 20.732 0.200 20.932
T90 18.804 0.668 19.472
T50 4.304 2.996 7.300
Peak 1.000 4.384 5.384
====== 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 -1.990 -0.141 0.136 - - - 5.47e-03 -4.93e-04 4.85e-04 52.400 57
CPL -1.465 -0.534 0.618 43.096 -31.009 129.659 1.09e-02 -5.40e-03 1.35e-02 49.630 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 -2.013 -0.200 0.187 - - - 1.96e-02 -2.67e-03 2.61e-03 66.050 57
CPL -1.381 -0.676 0.785 42.728 -40.123 -42.728 4.46e-02 -2.57e-02 7.77e-02 63.500 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 2.30e-07 3.14e-07 3.16e-07 5.77e-07 1.05e-06 1.44e-06 erg/cm2
90%_error_low -2.41e-08 -2.27e-08 -3.88e-08 -1.30e-07 -8.88e-08 -1.74e-07 erg/cm2
90%_error_hi 2.47e-08 2.27e-08 3.93e-08 1.54e-07 9.00e-08 1.92e-07 erg/cm2
Peak flux PL 1.32e+00 9.84e-01 4.88e-01 3.44e-01 2.96e+00 3.14e+00 ph/cm2/s
90%_error_low -1.91e-01 -1.04e-01 -8.60e-02 -1.03e-01 -3.11e-01 -3.33e-01 ph/cm2/s
90%_error_hi 1.96e-01 1.04e-01 8.69e-02 1.25e-01 3.11e-01 3.34e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -2.41e-08 -2.27e-08 -3.88e-08 -1.30e-07 -8.88e-08 -1.74e-07 erg/cm2
90%_error_hi 2.47e-08 2.27e-08 3.93e-08 1.54e-07 9.00e-08 1.92e-07 erg/cm2
Peak flux CPL 1.24e+00 1.06e+00 4.96e-01 1.62e-01 2.91e+00 2.96e+00 ph/cm2/s
90%_error_low -2.17e-01 -1.33e-01 -9.56e-02 -9.44e-02 -3.14e-01 -3.33e-01 ph/cm2/s
90%_error_hi 2.17e-01 1.37e-01 9.61e-02 2.13e-01 3.14e-01 3.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 246.8977 78.3949 0.0084 29.0599 126.2996 1.5330379 22.990 TRIG_00997453 Foreground time interval of the image: 0.200 10.381 (delta_t = 10.181 [sec]) Background time interval of the image: -239.720 0.200 (delta_t = 239.920 [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 0.200 sec. to 20.932 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.98991 ( -0.140577 0.135816 ) Norm@50keV : 5.47260E-03 ( -0.000492798 0.000485181 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.40 using 59 bins. Reduced chi-squared = 0.919298 # Null hypothesis probability of 6.48e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 20.73 sec: 0.817165 ( -0.059504 0.059539 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04585e-06 ( -8.87669e-08 9.00486e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.200 sec. to 20.932 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.46546 ( -0.534396 0.617606 ) Epeak [keV] : 43.0963 ( -31.0091 129.658 ) Norm@50keV : 1.08968E-02 ( -0.00540433 0.01351 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.63 using 59 bins. Reduced chi-squared = 0.88625 # Null hypothesis probability of 7.13e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 20.73 sec: 0.798298 ( -0.062426 0.062455 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.384 sec. to 5.384 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.01319 ( -0.199849 0.186908 ) Norm@50keV : 1.95835E-02 ( -0.00267255 0.00260717 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 66.05 using 59 bins. Reduced chi-squared = 1.15877 # Null hypothesis probability of 1.93e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.95571 ( -0.31057 0.31059 ) ph/cm2/s Energy fluence (15-150 keV) : 1.80759e-07 ( -2.29034e-08 2.33114e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.384 sec. to 5.384 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38133 ( -0.675496 0.785325 ) Epeak [keV] : 42.7285 ( -40.1301 -42.7358 ) Norm@50keV : 4.45894E-02 ( -0.0256606 0.0777178 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 63.50 using 59 bins. Reduced chi-squared = 1.13393 # Null hypothesis probability of 2.29e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.90743 ( -0.31392 0.31425 ) ph/cm2/s Energy fluence (15-150 keV) : 1.73057e-07 ( -2.36366e-08 2.44716e-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 = -3.289651009202840E-01, IMY = -4.478379599217988E-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: -239.720000 0.200000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4570 35.3871 24.3 53.3 -176.0 -0.4333 -0.5 2.7 Her X-1 110.7972 31.0174 2.6 52.4 13.0 4.1340 4.3 ------ UNKNOWN 146.9274 45.9607 3.1 22.7 -6.0 0.9905 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.200000 10.380600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3121 35.3322 9.2 53.3 -175.8 0.1836 1.3 7.2 Her X-1 246.8977 78.3949 0.5 29.1 126.3 1.5330 23.0 ------ UNKNOWN 204.9508 31.9103 2.6 32.1 -121.8 0.2894 4.5 ------ UNKNOWN 147.2288 13.1872 2.8 51.0 -35.8 0.5672 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.380630 415.073500 416.280000 962.414900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2977 35.4051 9.4 43.1 -162.8 -1.8321 -1.2 8.7 Her X-1 299.6745 35.2196 3.9 48.4 145.6 11.3850 2.9 4.3 Cyg X-1 308.1418 40.9318 3.9 44.4 134.8 9.5283 3.0 1.9 Cyg X-3 230.6846 27.9779 3.2 50.9 -135.4 14.0341 3.6 ------ UNKNOWN