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 23:47:42 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1037339
======================================================================
Trigger: 01037339 Segment: 000
BAT Trigger Time: 637732498.368 [s; MET]
Trigger Stop: 637732501.44 [s; MET]
UTC: 2021-03-18T03:54:31.681240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.9302682502313 Dec: -37.7895119002422 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: NO
Rate S/N Ratio: 11.2694276695846 [ if not an image trigger ]
Image S/N Ratio: 7.72
Analysis Position: [ source = BAT ]
RA: 33.9302682502313 Dec: -37.7895119002422 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 33.9037670566305 Dec: -37.7724157060411 [deg; J2000]
{ 02h 15m 36.9s , -37d 46' 20.7" }
+/- 2.51594833469396 [arcmin] (estimated 90% radius based on SNR)
+/- 0.990562315218269 [arcmin] (formal 1-sigma fit error)
SNR: 8.14117993309832
Angular difference between the analysis and refined position is 1.622211 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 80 +/- 50.5964425626941
Measured from: 0.631999969482422
to: 80.6319999694824 [s; relative to TRIGTIME]
T50: 16 +/- 48
Measured from: 0.631999969482422
to: 16.6319999694824 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.13199996948242
to: 9.13199996948242 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.631999969482422
to: 96.6319999694824 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.187743 0.492939 0.398730 0.139290
0.073311 0.076115 0.068829 0.065786 [error]
Peak 0.005030 0.028501 -0.000319 0.013767
0.008531 0.008490 0.007735 0.007178 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 96.000 0.632 96.632
T90 80.000 0.632 80.632
T50 16.000 0.632 16.632
Peak 1.000 8.132 9.132
====== 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 -1.280 -0.335 0.342 - - - 8.40e-04 -1.57e-04 1.57e-04 59.760 57
CPL -1.043 -1.808 1.237 212.681 -212.681 -212.681 1.09e-03 -4.05e-04 2.88e-03 59.740 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 -1.678 -1.350 1.394 - - - 2.41e-03 -1.77e-03 1.71e-03 57.900 57
CPL 5.550 N/A N/A 35.250 N/A N/A 1.20e+02 N/A N/A 54.350 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 8.38e-08 1.76e-07 2.90e-07 1.08e-06 8.01e-07 1.63e-06 erg/cm2
90%_error_low -2.76e-08 -3.70e-08 -6.83e-08 -4.69e-07 -1.67e-07 -5.28e-07 erg/cm2
90%_error_hi 3.04e-08 3.60e-08 6.70e-08 6.81e-07 1.70e-07 7.08e-07 erg/cm2
Peak flux PL 1.18e-01 1.07e-01 6.65e-02 6.34e-02 3.17e-01 3.54e-01 ph/cm2/s
90%_error_low -1.18e-01 -1.07e-01 -5.41e-02 -6.34e-02 -2.07e-01 -2.33e-01 ph/cm2/s
90%_error_hi 1.19e-01 7.00e-02 6.19e-02 2.27e-01 2.08e-01 6.29e-01 ph/cm2/s
Fluence CPL 8.16e-08 1.78e-07 2.94e-07 8.79e-07 7.93e-07 1.43e-06 erg/cm2
90%_error_low -3.32e-08 -3.88e-08 -7.10e-08 -6.91e-07 -1.80e-07 -7.23e-07 erg/cm2
90%_error_hi 2.80e-08 4.21e-08 7.56e-08 5.72e-07 1.76e-07 3.89e-07 erg/cm2
Peak flux CPL 6.38e-02 2.18e-01 1.43e-02 3.72e-07 2.92e-01 2.90e-01 ph/cm2/s
90%_error_low -6.38e-02 -2.18e-01 -1.43e-02 -3.72e-07 -1.46e-01 -1.44e-01 ph/cm2/s
90%_error_hi 1.30e-01 1.02e-01 4.77e-02 1.92e-03 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 33.9038 -37.7724 0.0236 30.4678 -152.3846 0.9503037 8.141 TRIG_01037339 Foreground time interval of the image: 0.632 44.133 (delta_t = 43.501 [sec]) Background time interval of the image: -239.368 0.632 (delta_t = 240.000 [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 0.632 sec. to 96.632 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27997 ( -0.335135 0.341553 ) Norm@50keV : 8.39768E-04 ( -0.000157072 0.000156812 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.76 using 59 bins. Reduced chi-squared = 1.04842 # Null hypothesis probability of 3.76e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 96 sec: 9.98271E-02 ( -0.0190271 0.0191009 ) ph/cm2/s Energy fluence (15-150 keV) : 8.00702e-07 ( -1.67356e-07 1.70235e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.632 sec. to 96.632 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.04314 ( -1.74586 1.29935 ) Epeak [keV] : 212.681 ( -293.15 -293.15 ) Norm@50keV : 1.09387E-03 ( -0.000284849 0.00299583 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.74 using 59 bins. Reduced chi-squared = 1.06679 # Null hypothesis probability of 3.42e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 96 sec: 9.92000E-02 ( -0.0197226 0.019525 ) ph/cm2/s Energy fluence (15-150 keV) : 7.93051e-07 ( -1.79782e-07 1.75586e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.132 sec. to 9.132 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.67846 ( -1.34937 1.39518 ) Norm@50keV : 2.40740E-03 ( -0.00176941 0.00170942 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.90 using 59 bins. Reduced chi-squared = 1.01579 # Null hypothesis probability of 4.42e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.317387 ( -0.207242 0.20798 ) ph/cm2/s Energy fluence (15-150 keV) : 2.23254e-08 ( -1.57058e-08 1.79463e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.132 sec. to 9.132 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 9.80268 ( ) Epeak [keV] : 34.7778 ( ) Norm@50keV : 5.10085E+04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.69 using 59 bins. Reduced chi-squared = 0.95875 # Null hypothesis probability of 5.63e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.291972 ( -0.145799 0.178887 ) ph/cm2/s Energy fluence (15-150 keV) : 1.5056e-08 ( -7.46987e-09 8.87936e-09 ) 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 = -5.212699673120080E-01, IMY = 2.726921884670455E-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: -239.368000 0.632000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6588 22.0042 1.3 46.5 45.9 8.6095 8.8 1.5 Crab 83.0543 4.9080 2.6 36.3 66.9 3.3219 4.5 ------ UNKNOWN 31.9226 -3.5251 3.5 19.8 -67.4 1.1316 3.3 ------ UNKNOWN 13.0256 -64.8367 3.6 59.6 -161.2 8.7980 3.2 ------ UNKNOWN 11.3393 10.8393 3.4 44.6 -60.4 4.4144 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.632000 44.132600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7743 22.0153 21.9 46.6 46.0 0.2248 0.5 7.8 Crab 82.5412 1.4740 2.3 34.4 71.9 1.0867 4.9 ------ UNKNOWN 86.2932 -58.0217 2.1 54.2 158.9 2.7167 5.4 ------ UNKNOWN 66.2725 28.3881 1.9 42.4 22.4 1.0937 6.0 ------ UNKNOWN 69.3896 -5.3811 2.0 19.7 76.0 0.6730 5.9 ------ UNKNOWN 33.9038 -37.7724 1.4 30.5 -152.4 0.9504 8.1 ------ UNKNOWN 30.7655 29.0728 2.3 44.4 -23.4 0.8845 5.0 ------ UNKNOWN 25.9835 43.3478 2.0 58.8 -19.1 3.2508 5.7 ------ UNKNOWN 5.4105 -54.7449 2.1 56.1 -149.2 2.6894 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 107.132590 962.693000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 60.3509 -60.0300 2.4 27.8 112.4 5.8876 4.8 ------ UNKNOWN 48.3304 -52.7171 3.3 17.9 111.6 3.3746 3.5 ------ UNKNOWN 312.6231 -66.6092 3.0 52.4 170.4 10.3584 3.9 ------ UNKNOWN 0.7909 -21.8439 3.4 32.7 -109.5 4.8983 3.4 ------ UNKNOWN 40.9225 17.4499 2.9 55.6 -31.2 15.8921 4.0 ------ UNKNOWN