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 23:01:16 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1056757
======================================================================
Trigger: 01056757 Segment: 000
BAT Trigger Time: 645839992.896 [s; MET]
Trigger Stop: 645839992.96 [s; MET]
UTC: 2021-06-19T23:59:25.669220 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 319.712963521213 Dec: 33.8598882356361 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.13
Image Trigger?: NO
Rate S/N Ratio: 67.0223843204642 [ if not an image trigger ]
Image S/N Ratio: 8.13
Analysis Position: [ source = BAT ]
RA: 319.712963521213 Dec: 33.8598882356361 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 319.717897042299 Dec: 33.8496948883427 [deg; J2000]
{ 21h 18m 52.3s , +33d 50' 58.9" }
+/- 0.688200917310961 [arcmin] (estimated 90% radius based on SNR)
+/- 0.171398549015523 [arcmin] (formal 1-sigma fit error)
SNR: 51.8744781958997
Angular difference between the analysis and refined position is 0.659154 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 60.9119999408722 +/- 0.273437333691359
Measured from: 0.748000025749207
to: 61.6599999666214 [s; relative to TRIGTIME]
T50: 44.743999838829 +/- 0.0913892746406732
Measured from: 2.86800003051758
to: 47.6119998693466 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.952000021934509
to: 1.95200002193451 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.248000025749207
to: 108.027999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 32.453149 49.655606 43.359926 12.796806
0.177534 0.211954 0.206673 0.156737 [error]
Peak 2.220616 4.572264 5.385109 2.031736
0.044354 0.062165 0.070497 0.054060 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 108.276 -0.248 108.028
T90 60.912 0.748 61.660
T50 44.744 2.868 47.612
Peak 1.000 0.952 1.952
====== 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 -1.404 -0.021 0.021 - - - 9.07e-02 -1.15e-03 1.14e-03 48.970 57
CPL -1.250 -0.086 0.087 327.218 -92.980 309.678 1.04e-01 -7.26e-03 7.90e-03 39.660 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 -0.957 -0.032 0.032 - - - 1.00e+00 -1.85e-02 1.85e-02 64.150 57
CPL -0.662 -0.132 0.135 286.165 -69.382 170.703 1.32e+00 -1.48e-01 1.71e-01 49.080 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 1.15e-05 2.23e-05 3.38e-05 1.11e-04 9.49e-05 1.78e-04 erg/cm2
90%_error_low -3.16e-07 -3.77e-07 -3.80e-07 -2.83e-06 -1.07e-06 -2.84e-06 erg/cm2
90%_error_hi 3.21e-07 3.77e-07 3.80e-07 2.87e-06 1.07e-06 2.87e-06 erg/cm2
Peak flux PL 2.46e+01 3.42e+01 3.53e+01 6.65e+01 1.15e+02 1.61e+02 ph/cm2/s
90%_error_low -9.76e-01 -8.33e-01 -6.42e-01 -2.63e+00 -2.17e+00 -3.01e+00 ph/cm2/s
90%_error_hi 9.93e-01 8.32e-01 6.41e-01 2.69e+00 2.17e+00 3.02e+00 ph/cm2/s
Fluence CPL 1.08e-05 2.23e-05 3.45e-05 9.64e-05 9.45e-05 1.64e-04 erg/cm2
90%_error_low -4.55e-07 -3.84e-07 -5.26e-07 -7.18e-06 -1.09e-06 -7.21e-06 erg/cm2
90%_error_hi 4.64e-07 3.83e-07 5.27e-07 7.91e-06 1.09e-06 7.92e-06 erg/cm2
Peak flux CPL 2.23e+01 3.43e+01 3.67e+01 5.18e+01 1.14e+02 1.45e+02 ph/cm2/s
90%_error_low -1.33e+00 -8.59e-01 -8.77e-01 -5.28e+00 -2.26e+00 -5.88e+00 ph/cm2/s
90%_error_hi 1.36e+00 8.58e-01 8.81e-01 6.05e+00 2.26e+00 6.54e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 319.7179 33.8497 0.0037 35.8712 -58.5337 57.3937193 51.874 TRIG_01056757 Foreground time interval of the image: -0.248 9.005 (delta_t = 9.253 [sec]) Background time interval of the image: -239.896 -0.248 (delta_t = 239.648 [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 -0.248 sec. to 108.028 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40355 ( -0.0208045 0.020889 ) Norm@50keV : 9.07475E-02 ( -0.00114518 0.00114274 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 48.97 using 59 bins. Reduced chi-squared = 0.859123 # Null hypothesis probability of 7.66e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 108.3 sec: 11.0605 ( -0.1704 0.171 ) ph/cm2/s Energy fluence (15-150 keV) : 9.49071e-05 ( -1.06698e-06 1.06799e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.248 sec. to 108.028 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.24995 ( -0.0860046 0.0874716 ) Epeak [keV] : 327.218 ( -92.98 309.678 ) Norm@50keV : 0.103561 ( -0.00725648 0.00789908 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 39.66 using 59 bins. Reduced chi-squared = 0.708214 # Null hypothesis probability of 9.52e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 108.3 sec: 10.8864 ( -0.1924 0.1938 ) ph/cm2/s Energy fluence (15-150 keV) : 9.45167e-05 ( -1.08621e-06 1.08786e-06 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.952 sec. to 1.952 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.957149 ( -0.0316382 0.031768 ) Norm@50keV : 1.00258 ( -0.0185298 0.0184969 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 64.15 using 59 bins. Reduced chi-squared = 1.12544 # Null hypothesis probability of 2.40e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 115.212 ( -2.169 2.172 ) ph/cm2/s Energy fluence (15-150 keV) : 1.10118e-05 ( -2.02191e-07 2.02444e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.952 sec. to 1.952 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.662 ( -0.131535 0.135256 ) Epeak [keV] : 286.165 ( -69.3822 170.702 ) Norm@50keV : 1.31820 ( -0.148166 0.171107 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.08 using 59 bins. Reduced chi-squared = 0.876429 # Null hypothesis probability of 7.32e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 113.647 ( -2.256 2.261 ) ph/cm2/s Energy fluence (15-150 keV) : 1.08111e-06 ( -7.7876e-07 4.92324e-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 = 3.774619440631801E-01, IMY = 6.167769935940357E-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: -239.896000 -0.248000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5016 35.2476 2.8 32.3 -163.1 1.7075 4.1 6.1 Her X-1 268.3966 -1.6261 6.7 24.3 108.4 -0.7659 -1.7 10.6 SW J1753.5-0127 273.9626 -13.8567 5.9 32.4 85.6 1.1229 1.9 11.1 GX 17+2 288.8126 10.7755 7.9 7.5 30.9 0.4994 1.5 10.2 GRS 1915+105 299.5959 35.2074 0.5 22.8 -80.0 10.0701 22.9 0.4 Cyg X-1 308.3555 40.9993 0.0 31.7 -77.9 0.6653 1.1 11.5 Cyg X-3 326.2260 38.2866 8.6 42.3 -62.5 1.6918 1.3 3.3 Cyg X-2 306.8806 -26.7980 3.1 48.8 39.5 5.1542 3.8 ------ UNKNOWN 316.6802 -6.7934 2.8 39.7 10.4 2.4856 4.0 ------ UNKNOWN 238.9196 25.4099 2.8 43.1 175.8 2.6062 4.2 ------ UNKNOWN 331.6898 -0.4549 4.2 49.7 -8.0 1.9890 2.8 ------ UNKNOWN 332.1191 3.8539 2.5 48.6 -13.5 3.2962 4.6 ------ UNKNOWN 258.3931 43.4065 2.6 34.5 -147.8 1.9354 4.4 ------ UNKNOWN 292.2726 58.2696 2.9 41.8 -107.3 8.9845 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.248000 9.004590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6367 35.3166 6.0 32.3 -162.9 -1.0753 -1.9 8.9 Her X-1 268.3898 -1.6232 5.0 24.3 108.5 -1.1819 -2.3 10.3 SW J1753.5-0127 273.9283 -13.9143 8.4 32.5 85.6 0.9258 1.4 8.6 GX 17+2 288.7022 10.8372 10.6 7.4 31.4 0.5146 1.1 8.6 GRS 1915+105 299.5696 35.0370 30.8 22.6 -79.7 0.2376 0.4 9.9 Cyg X-1 308.3555 40.9993 0.0 31.7 -77.9 0.9816 1.1 11.5 Cyg X-3 326.0967 38.1692 6.4 42.2 -62.4 3.5359 1.8 9.8 Cyg X-2 305.0534 -25.4215 3.8 46.8 40.6 3.4628 3.0 ------ UNKNOWN 243.1466 -1.4976 4.3 44.6 136.2 3.6454 2.7 ------ UNKNOWN 270.0125 -4.2096 3.0 25.4 101.7 1.9960 3.9 ------ UNKNOWN 250.0497 10.8514 2.9 33.9 150.7 2.5225 4.0 ------ UNKNOWN 229.5116 34.7475 3.8 51.8 -172.3 3.6909 3.1 ------ UNKNOWN 227.2974 34.4871 3.0 53.6 -172.8 4.8685 3.8 ------ UNKNOWN 319.7179 33.8497 0.2 35.9 -58.5 57.3969 51.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 38.204590 55.804600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3357 35.2463 8.7 33.9 -150.5 -0.6044 -1.3 8.3 Her X-1 268.2157 -1.5721 0.0 25.1 125.6 -0.3913 -1.0 11.6 SW J1753.5-0127 274.0470 -14.1760 5.6 32.8 101.4 0.9265 2.1 8.7 GX 17+2 288.6741 10.9883 87.4 6.1 53.7 0.0380 0.1 7.8 GRS 1915+105 299.4099 35.1923 8.8 22.3 -70.2 0.4800 1.3 8.9 Cyg X-1 307.8941 40.8763 7.5 30.9 -66.9 -0.7523 -1.5 10.8 Cyg X-3 326.1685 38.2865 98.7 41.4 -50.2 0.0886 0.1 2.1 Cyg X-2 288.7415 -21.3944 3.6 37.9 75.5 2.7090 3.2 ------ UNKNOWN 315.3211 -20.4245 3.2 46.8 40.7 2.7632 3.6 ------ UNKNOWN 249.5255 -9.8007 4.4 44.6 136.2 2.7710 2.6 ------ UNKNOWN 340.0265 1.0121 2.8 55.4 0.2 4.2102 4.1 ------ UNKNOWN 276.7052 27.5197 2.5 14.0 -136.4 1.3115 4.6 ------ UNKNOWN 259.6173 30.1654 3.1 27.7 -155.9 1.0792 3.7 ------ UNKNOWN 272.6523 33.8877 3.4 21.2 -132.3 1.0314 3.4 ------ UNKNOWN 319.7067 33.8616 0.2 34.9 -46.6 29.4205 54.9 ------ UNKNOWN