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: Mon Oct 24 11:34:57 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1115766
======================================================================
Trigger: 01115766 Segment: 000
BAT Trigger Time: 679256218.176 [s; MET]
Trigger Stop: 679256219.2 [s; MET]
UTC: 2022-07-11T18:16:28.698520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.993124762887 Dec: 24.6695933765762 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.6
Image Trigger?: NO
Rate S/N Ratio: 20.3715487874634 [ if not an image trigger ]
Image S/N Ratio: 9.6
Analysis Position: [ source = BAT ]
RA: 261.993124762887 Dec: 24.6695933765762 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 262.017940308421 Dec: 24.6750002115334 [deg; J2000]
{ 17h 28m 04.3s , +24d 40' 30.0" }
+/- 1.27242467600038 [arcmin] (estimated 90% radius based on SNR)
+/- 0.571123707529293 [arcmin] (formal 1-sigma fit error)
SNR: 21.5597626819381
Angular difference between the analysis and refined position is 1.391357 arcmin
Partial Coding Fraction: 0.1953125 [ including projection effects ]
Duration
T90: 87.055999994278 +/- 9.32164452855154
Measured from: -29.7519999742508
to: 57.3040000200272 [s; relative to TRIGTIME]
T50: 29.5360000133514 +/- 15.1248161917351
Measured from: -1.94400000572205
to: 27.5920000076294 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0199999809265137
to: 0.980000019073486 [s; relative to TRIGTIME]
Total Fluence
Measured from: -37.4960000514984
to: 79.6879999637604 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.815780 3.794684 2.333959 0.579195
0.128060 0.131831 0.112694 0.093472 [error]
Peak 0.048944 0.163606 0.139369 0.047999
0.016263 0.018449 0.016296 0.013147 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 117.184 -37.496 79.688
T90 87.056 -29.752 57.304
T50 29.536 -1.944 27.592
Peak 1.000 -0.020 0.980
====== 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 -1.738 -0.080 0.080 - - - 5.33e-03 -2.41e-04 2.40e-04 53.550 57
CPL -1.488 -0.282 0.327 100.165 -32.130 -100.165 7.15e-03 -1.94e-03 3.28e-03 51.600 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 -1.436 -0.192 0.190 - - - 2.48e-02 -3.40e-03 3.40e-03 88.190 57
CPL 0.162 -0.871 1.102 76.115 -13.830 28.115 1.37e-01 -8.15e-02 2.90e-01 76.990 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 9.97e-07 1.59e-06 1.90e-06 4.45e-06 5.77e-06 8.94e-06 erg/cm2
90%_error_low -7.40e-08 -7.13e-08 -1.15e-07 -5.51e-07 -2.70e-07 -6.46e-07 erg/cm2
90%_error_hi 7.57e-08 7.11e-08 1.15e-07 6.02e-07 2.71e-07 6.83e-07 erg/cm2
Peak flux PL 9.60e-01 1.00e+00 7.41e-01 8.84e-01 3.04e+00 3.59e+00 ph/cm2/s
90%_error_low -2.07e-01 -1.52e-01 -1.14e-01 -2.31e-01 -4.35e-01 -4.93e-01 ph/cm2/s
90%_error_hi 2.20e-01 1.51e-01 1.13e-01 2.64e-01 4.36e-01 4.93e-01 ph/cm2/s
Fluence CPL 9.57e-07 1.62e-06 1.92e-06 3.03e-06 5.65e-06 7.53e-06 erg/cm2
90%_error_low -8.81e-08 -8.47e-08 -1.20e-07 -1.09e-06 -3.08e-07 -1.13e-06 erg/cm2
90%_error_hi 8.96e-08 8.61e-08 1.21e-07 1.60e-06 3.07e-07 1.67e-06 erg/cm2
Peak flux CPL 6.70e-01 1.14e+00 9.30e-01 3.30e-01 2.99e+00 3.07e+00 ph/cm2/s
90%_error_low -2.36e-01 -1.88e-01 -1.56e-01 -1.60e-01 -4.37e-01 -4.67e-01 ph/cm2/s
90%_error_hi 2.58e-01 1.92e-01 1.61e-01 2.38e-01 4.39e-01 4.81e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 262.0179 24.6750 0.0089 36.3866 115.4109 5.7745610 21.560 TRIG_01115766 Foreground time interval of the image: -37.496 15.325 (delta_t = 52.821 [sec]) Background time interval of the image: -239.176 -37.496 (delta_t = 201.680 [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 -37.496 sec. to 79.688 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.73758 ( -0.080335 0.079686 ) Norm@50keV : 5.33038E-03 ( -0.000241046 0.000240137 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.55 using 59 bins. Reduced chi-squared = 0.939474 # Null hypothesis probability of 6.05e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 117.2 sec: 0.717518 ( -0.032676 0.032751 ) ph/cm2/s Energy fluence (15-150 keV) : 5.76963e-06 ( -2.69944e-07 2.71078e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -37.496 sec. to 79.688 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48826 ( -0.282003 0.326741 ) Epeak [keV] : 100.165 ( -32.131 -100.166 ) Norm@50keV : 7.15027E-03 ( -0.00194076 0.00327532 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 51.60 using 59 bins. Reduced chi-squared = 0.921429 # Null hypothesis probability of 6.42e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 117.2 sec: 0.706980 ( -0.034985 0.035036 ) ph/cm2/s Energy fluence (15-150 keV) : 5.6496e-06 ( -3.07925e-07 3.0685e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.020 sec. to 0.980 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43626 ( -0.191683 0.190057 ) Norm@50keV : 2.47838E-02 ( -0.00340061 0.00339995 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 88.19 using 59 bins. Reduced chi-squared = 1.54719 # Null hypothesis probability of 5.05e-03 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 3.04412 ( -0.43481 0.43603 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37799e-07 ( -3.39822e-08 3.40326e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.980 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.162297 ( -0.87092 1.10152 ) Epeak [keV] : 76.1146 ( -13.8299 28.1152 ) Norm@50keV : 0.137160 ( -0.0815291 0.289641 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 76.99 using 59 bins. Reduced chi-squared = 1.37482 # Null hypothesis probability of 3.29e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.98696 ( -0.43697 0.43873 ) ph/cm2/s Energy fluence (15-150 keV) : 2.38556e-07 ( -3.5741e-08 3.55067e-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 = -3.162101658055748E-01, IMY = -6.656095864535490E-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: -239.176000 -37.496000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3402 35.2923 3.6 26.3 129.8 1.2095 3.2 6.5 Her X-1 299.5427 35.1568 3.4 35.1 55.5 1.9985 3.4 3.6 Cyg X-1 307.9830 40.9640 6.3 34.0 40.0 0.8213 1.8 5.8 Cyg X-3 326.2156 38.3771 5.8 44.8 25.1 1.0372 2.0 3.9 Cyg X-2 227.5894 32.6691 2.2 36.2 169.3 2.0573 5.1 ------ UNKNOWN 2.1046 49.9006 2.5 52.0 -11.3 2.4745 4.6 ------ UNKNOWN 9.6326 48.2349 2.7 56.2 -15.0 3.3485 4.2 ------ UNKNOWN 72.1239 74.3248 2.8 44.4 -61.1 4.9880 4.2 ------ UNKNOWN 175.6612 47.9084 2.2 48.0 -129.1 6.0149 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -37.496000 15.324600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4038 35.1561 0.0 26.4 129.6 0.2087 1.5 11.5 Her X-1 299.6687 35.3219 3.7 35.0 55.2 0.6575 3.1 8.2 Cyg X-1 308.0544 40.8211 4.6 34.2 40.1 0.4253 2.5 8.3 Cyg X-3 326.1501 38.3106 47.3 44.8 25.2 0.0573 0.2 1.2 Cyg X-2 262.0179 24.6750 0.5 36.4 115.4 5.7753 21.6 ------ UNKNOWN 8.6295 54.7813 2.2 50.5 -19.1 1.1168 5.3 ------ UNKNOWN 178.8448 68.4959 2.1 33.4 -106.3 0.7847 5.4 ------ UNKNOWN 104.2716 76.2733 2.4 42.0 -72.6 1.7504 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 91.324590 914.024600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9658 -15.6358 0.7 43.6 147.9 59.5385 15.9 0.8 Sco X-1 254.3688 35.3548 3.1 12.5 -86.3 4.0488 3.8 4.4 Her X-1 268.4023 -1.6008 7.5 27.0 109.5 -2.8444 -1.5 9.1 SW J1753.5-0127 274.0646 -13.9816 8.1 40.4 105.5 -7.3739 -1.4 4.7 GX 17+2 288.9287 10.9945 5.9 29.0 57.1 -3.4686 -1.9 8.2 GRS 1915+105 299.6045 35.1757 1.0 34.0 6.8 16.3910 11.4 1.7 Cyg X-1 308.1889 40.8607 3.4 41.5 -0.8 5.6279 3.4 6.6 Cyg X-3 326.1689 38.2967 6.3 55.3 3.0 3.9369 1.8 1.5 Cyg X-2 255.6583 -19.1149 3.1 44.2 132.3 21.2079 3.7 ------ UNKNOWN 286.9479 23.4120 2.8 22.8 31.7 4.7537 4.1 ------ UNKNOWN 237.1069 -2.1731 2.3 36.1 169.3 7.9195 5.0 ------ UNKNOWN 297.6442 45.6825 3.6 35.4 -11.7 4.3505 3.2 ------ UNKNOWN 289.7819 59.4383 2.8 39.8 -34.6 6.1713 4.1 ------ UNKNOWN 252.6636 68.7751 2.5 44.4 -61.1 23.3120 4.7 ------ UNKNOWN 207.9921 28.6858 2.5 48.0 -129.0 21.7211 4.6 ------ UNKNOWN