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 22:42:53 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1061554
======================================================================
Trigger: 01061554 Segment: 000
BAT Trigger Time: 648907275.456 [s; MET]
Trigger Stop: 648907278.528 [s; MET]
UTC: 2021-07-25T12:00:48.024580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 192.932182299759 Dec: 17.1251868322912 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.81
Image Trigger?: NO
Rate S/N Ratio: 11 [ if not an image trigger ]
Image S/N Ratio: 7.81
Analysis Position: [ source = BAT ]
RA: 192.932182299759 Dec: 17.1251868322912 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 192.890888455284 Dec: 17.1017936462215 [deg; J2000]
{ 12h 51m 33.8s , +17d 06' 06.5" }
+/- 3.25037354393711 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52588488265531 [arcmin] (formal 1-sigma fit error)
SNR: 5.64657538750426
Angular difference between the analysis and refined position is 2.752665 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 417.907999873161 +/- 158.76587538321
Measured from: 0.820000052452087
to: 418.727999925613 [s; relative to TRIGTIME]
T50: 290.359999895096 +/- 274.904362450144
Measured from: 5.74800002574921
to: 296.107999920845 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.972000002861023
to: 1.97200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.096000075340271
to: 432.399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.283942 0.531999 0.493366 0.008465
0.141367 0.146733 0.130113 0.120038 [error]
Peak 0.018472 0.026418 0.026145 0.020536
0.006884 0.007501 0.006963 0.006392 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 432.304 0.096 432.400
T90 417.908 0.820 418.728
T50 290.360 5.748 296.108
Peak 1.000 0.972 1.972
====== 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 -1.409 -0.510 0.495 - - - 2.06e-04 -6.39e-05 6.29e-05 39.750 57
CPL -0.108 -1.668 3.359 72.168 -28.543 -72.168 9.37e-04 -9.37e-04 3.42e-02 38.530 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 -1.152 -0.509 0.552 - - - 4.87e-03 -1.37e-03 1.37e-03 70.800 57
CPL -1.153 -0.507 0.560 9999.360 -9999.360 -9999.360 4.89e-03 -1.38e-03 5.39e-02 70.810 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 1.05e-07 2.03e-07 3.06e-07 9.98e-07 8.60e-07 1.61e-06 erg/cm2
90%_error_low -4.63e-08 -6.25e-08 -1.19e-07 -6.15e-07 -2.90e-07 -7.51e-07 erg/cm2
90%_error_hi 5.18e-08 6.18e-08 1.20e-07 1.07e-06 3.02e-07 1.13e-06 erg/cm2
Peak flux PL 1.44e-01 1.78e-01 1.60e-01 2.50e-01 5.68e-01 7.32e-01 ph/cm2/s
90%_error_low -7.24e-02 -6.05e-02 -5.48e-02 -1.42e-01 -1.62e-01 -2.21e-01 ph/cm2/s
90%_error_hi 8.28e-02 5.71e-02 5.32e-02 2.40e-01 1.63e-01 2.43e-01 ph/cm2/s
Fluence CPL 8.41e-08 2.31e-07 3.27e-07 2.20e-07 7.85e-07 8.62e-07 erg/cm2
90%_error_low -5.67e-08 -7.66e-08 -1.43e-07 -2.01e-07 -2.84e-07 -3.58e-07 erg/cm2
90%_error_hi 6.07e-08 8.34e-08 1.45e-07 1.24e-06 3.20e-07 1.14e-06 erg/cm2
Peak flux CPL 1.49e-01 1.76e-01 1.59e-01 2.54e-01 5.71e-01 7.34e-01 ph/cm2/s
90%_error_low -7.80e-02 -6.14e-02 -5.37e-02 N/A -1.73e-01 -2.82e-01 ph/cm2/s
90%_error_hi 7.19e-02 7.19e-02 5.63e-02 N/A 1.66e-01 2.14e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 192.8909 17.1018 0.0342 11.4447 147.5529 0.5221035 5.647 TRIG_01061554 Foreground time interval of the image: 0.096 43.845 (delta_t = 43.749 [sec]) Background time interval of the image: -239.456 0.096 (delta_t = 239.552 [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 0.096 sec. to 432.400 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40945 ( -0.5105 0.494452 ) Norm@50keV : 2.06194E-04 ( -6.39373e-05 6.29256e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 39.75 using 59 bins. Reduced chi-squared = 0.697368 # Null hypothesis probability of 9.60e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 432.3 sec: 2.51652E-02 ( -0.0074806 0.0074901 ) ph/cm2/s Energy fluence (15-150 keV) : 8.59814e-07 ( -2.89657e-07 3.01675e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.096 sec. to 432.400 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.108394 ( -1.67681 3.35037 ) Epeak [keV] : 72.1678 ( -28.395 -72.0194 ) Norm@50keV : 9.37186E-04 ( -0.000946202 0.0341804 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 38.53 using 59 bins. Reduced chi-squared = 0.688036 # Null hypothesis probability of 9.64e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 432.3 sec: 2.39578E-02 ( -0.0077259 0.0077241 ) ph/cm2/s Energy fluence (15-150 keV) : 7.85174e-07 ( -2.84188e-07 3.20496e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.972 sec. to 1.972 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15198 ( -0.508623 0.552363 ) Norm@50keV : 4.87006E-03 ( -0.00137411 0.00137411 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 70.80 using 59 bins. Reduced chi-squared = 1.24211 # Null hypothesis probability of 1.03e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.568083 ( -0.162269 0.162631 ) ph/cm2/s Energy fluence (15-150 keV) : 5.01095e-08 ( -1.60452e-08 1.65666e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.972 sec. to 1.972 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15271 ( -0.507101 0.559875 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 4.89331E-03 ( -0.00138378 0.0539122 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 70.81 using 59 bins. Reduced chi-squared = 1.26446 # Null hypothesis probability of 8.79e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.570808 ( -0.17269 0.165905 ) ph/cm2/s Energy fluence (15-150 keV) : 5.05068e-08 ( -1.93086e-08 1.15615e-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 = -1.708432704522193E-01, IMY = -1.086174351391151E-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: -239.456000 0.096000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 196.5383 12.0661 3.1 17.4 141.3 1.0914 3.7 ------ UNKNOWN 219.7894 79.2356 3.0 53.0 -6.1 2.4517 3.8 ------ UNKNOWN 160.6724 -22.2244 2.8 57.1 -161.5 5.1144 4.1 ------ UNKNOWN 160.1492 -15.9393 3.2 52.0 -157.0 2.7559 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.096000 43.844590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 163.1471 -11.1695 2.4 46.4 -156.9 0.8467 4.8 ------ UNKNOWN 132.3664 75.1915 2.2 54.7 -28.1 2.2181 5.2 ------ UNKNOWN 140.4065 38.0238 2.6 41.4 -76.1 1.5535 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 74.844590 437.844600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 229.6090 41.8736 4.5 39.9 30.3 1.6461 2.6 ------ UNKNOWN 229.9444 46.2706 2.4 42.2 24.6 3.4019 4.9 ------ UNKNOWN