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 v2.47
Process Start Time: Mon May 18 14:45:32 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger956824
======================================================================
Trigger: 00956824 Segment: 000
BAT Trigger Time: 603552778.304 [s; MET]
Trigger Stop: 603552778.816 [s; MET]
UTC: 2020-02-16T13:32:33.858540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 160.460729941118 Dec: 19.4541045214607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.23
Image Trigger?: NO
Rate S/N Ratio: 15.1657508881031 [ if not an image trigger ]
Image S/N Ratio: 8.23
Analysis Position: [ source = BAT ]
RA: 160.460729941118 Dec: 19.4541045214607 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 160.454200385875 Dec: 19.4711343785963 [deg; J2000]
{ 10h 41m 49.0s , +19d 28' 16.1" }
+/- 0.930348304476157 [arcmin] (estimated 90% radius based on SNR)
+/- 0.254245413202635 [arcmin] (formal 1-sigma fit error)
SNR: 33.721774674736
Angular difference between the analysis and refined position is 1.086510 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 67.4479998350143 +/- 6.56804386229279
Measured from: 0.48800003528595
to: 67.9359998703003 [s; relative to TRIGTIME]
T50: 38.1959999799728 +/- 5.19073182678569
Measured from: 4.04799997806549
to: 42.2439999580383 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.80400002002716
to: 3.80400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.720000028610229
to: 79.7200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.964773 1.285195 0.662680 0.083340
0.052608 0.054789 0.046636 0.039026 [error]
Peak 0.039480 0.075597 0.064275 0.013460
0.006655 0.007643 0.006608 0.004939 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 80.440 -0.720 79.720
T90 67.448 0.488 67.936
T50 38.196 4.048 42.244
Peak 1.000 2.804 3.804
====== 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: CPL)
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 -1.850 -0.098 0.096 - - - 2.29e-03 -1.41e-04 1.40e-04 71.150 57
CPL -0.658 -0.469 0.527 49.722 -5.040 7.234 1.03e-02 -4.58e-03 9.73e-03 49.010 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.350 -0.174 0.174 - - - 1.27e-02 -1.42e-03 1.41e-03 59.380 57
CPL -0.118 -0.819 0.997 77.718 -15.673 54.189 5.26e-02 -3.17e-02 1.06e-01 52.300 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 3.28e-07 4.87e-07 5.40e-07 1.13e-06 1.70e-06 2.48e-06 erg/cm2
90%_error_low -2.68e-08 -2.63e-08 -4.46e-08 -1.79e-07 -1.04e-07 -2.25e-07 erg/cm2
90%_error_hi 2.73e-08 2.64e-08 4.49e-08 2.00e-07 1.05e-07 2.41e-07 erg/cm2
Peak flux PL 4.54e-01 5.00e-01 3.92e-01 5.07e-01 1.54e+00 1.85e+00 ph/cm2/s
90%_error_low -8.25e-02 -6.02e-02 -5.18e-02 -1.22e-01 -1.72e-01 -2.10e-01 ph/cm2/s
90%_error_hi 8.65e-02 5.97e-02 5.14e-02 1.42e-01 1.72e-01 2.12e-01 ph/cm2/s
Fluence CPL 2.83e-07 5.50e-07 5.29e-07 2.33e-07 1.53e-06 1.59e-06 erg/cm2
90%_error_low -3.17e-08 -3.56e-08 -5.44e-08 -9.81e-08 -1.14e-07 -1.50e-07 erg/cm2
90%_error_hi 3.20e-08 3.63e-08 5.30e-08 1.66e-07 1.18e-07 1.97e-07 erg/cm2
Peak flux CPL 3.63e-01 5.61e-01 4.38e-01 1.71e-01 1.48e+00 1.53e+00 ph/cm2/s
90%_error_low -9.95e-02 -7.50e-02 -6.29e-02 -8.60e-02 -1.76e-01 -1.98e-01 ph/cm2/s
90%_error_hi 1.04e-01 7.76e-02 6.45e-02 1.67e-01 1.76e-01 2.23e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 160.4542 19.4711 0.0057 23.2705 30.0367 1.5265929 33.722 TRIG_00956824 Foreground time interval of the image: -0.720 9.997 (delta_t = 10.717 [sec]) Background time interval of the image: -239.304 -0.720 (delta_t = 238.584 [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 -0.720 sec. to 79.720 sec. XSPEC12>exit XSPEC: quit Photon index: -1.85002 ( -0.0975652 0.0957537 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.85002 ( -0.0957537 0.0975652 ) Norm@50keV : 2.29378E-03 ( -0.000141019 0.000139955 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 80.44 sec: 0.322436 ( -0.017733 0.017748 ) ph/cm2/s Energy fluence (15-150 keV) : 1.69681e-06 ( -1.04447e-07 1.05345e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.720 sec. to 79.720 sec. XSPEC: quit Photon index: -0.657683 ( -0.469126 0.52667 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.657683 ( -0.52667 0.469126 ) Epeak [keV] : 49.7219 ( -5.03991 7.23416 ) Norm@50keV : 1.03498E-02 ( -0.0045772 0.009729 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 80.44 sec: 0.305269 ( -0.01873 0.018764 ) ph/cm2/s Energy fluence (15-150 keV) : 1.52733e-06 ( -1.14201e-07 1.18071e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.804 sec. to 3.804 sec. XSPEC12>exit XSPEC: quit Photon index: -1.34952 ( -0.173759 0.1736 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.34952 ( -0.1736 0.173759 ) Norm@50keV : 1.27463E-02 ( -0.00141608 0.00141378 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 1.53543 ( -0.17182 0.17201 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24517e-07 ( -1.51642e-08 1.52743e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.804 sec. to 3.804 sec. XSPEC: quit Photon index: -0.118322 ( -0.818952 0.997352 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.118322 ( -0.997352 0.818952 ) Epeak [keV] : 77.7184 ( -15.6731 54.1886 ) Norm@50keV : 5.26209E-02 ( -0.0316642 0.106226 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 1.48452 ( -0.17624 0.17597 ) ph/cm2/s Energy fluence (15-150 keV) : 1.16356e-07 ( -1.5973e-08 1.62735e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 67.448 sec. Hardness ratio (energy fluence ratio) = 0.96190006244
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.329238e-07 S(50-150 keV) = 6.944089e-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 = 3.723024656157209E-01, IMY = -2.152670034882408E-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: -239.304000 -0.720000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 172.3103 -3.3751 2.8 41.2 66.1 3.2075 4.1 ------ UNKNOWN 102.8085 -27.5856 3.1 55.1 166.0 4.1888 3.7 ------ UNKNOWN 196.6976 39.7878 2.7 56.8 2.9 4.6451 4.3 ------ UNKNOWN 194.1945 43.3825 3.5 55.3 -1.7 2.1625 3.3 ------ UNKNOWN 143.2830 31.8411 2.5 16.1 -27.7 0.9107 4.7 ------ UNKNOWN 190.6426 62.5505 2.5 58.9 -24.3 6.2110 4.7 ------ UNKNOWN 157.0323 65.7721 4.7 50.6 -39.4 1.9451 2.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.720000 9.996600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 160.4542 19.4711 0.3 23.3 30.0 1.5266 33.7 ------ UNKNOWN 111.5115 -4.3653 2.3 32.4 -179.7 0.2457 5.0 ------ UNKNOWN 115.1748 46.6379 2.1 34.2 -76.1 0.4114 5.5 ------ UNKNOWN 185.6749 64.5646 2.1 57.9 -27.6 1.4022 5.4 ------ UNKNOWN 83.1119 12.7755 2.7 51.2 -137.5 0.9302 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 101.196630 962.795000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 127.1779 6.2230 3.3 34.9 104.8 4.0099 3.5 ------ UNKNOWN 109.8720 44.3805 3.0 48.6 165.2 7.9143 3.9 ------ UNKNOWN 207.6703 -0.9165 2.9 50.6 -39.3 9.2899 3.9 ------ UNKNOWN 191.0680 62.5596 2.2 48.0 -129.1 13.2917 5.2 ------ UNKNOWN