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 Oct 13 22:47:03 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1142847
======================================================================
Trigger: 01142847 Segment: 000
BAT Trigger Time: 691590336 [s; MET]
Trigger Stop: 691590400 [s; MET]
UTC: 2022-12-01T12:25:05.684420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.933488910624 Dec: -68.2595112495696 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.65
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.65
Analysis Position: [ source = BAT ]
RA: 266.933488910624 Dec: -68.2595112495696 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 266.902237638968 Dec: -68.2297450175881 [deg; J2000]
{ 17h 47m 36.5s , -68d 13' 47.1" }
+/- 0.842356941330918 [arcmin] (estimated 90% radius based on SNR)
+/- 0.315855591279388 [arcmin] (formal 1-sigma fit error)
SNR: 38.8644421748075
Angular difference between the analysis and refined position is 1.916431 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 33.7199999094009 +/- 2.03901935339401
Measured from: -18.7599999904633
to: 14.9599999189377 [s; relative to TRIGTIME]
T50: 12.6920000314713 +/- 0.832742397966511
Measured from: -13.3200000524521
to: -0.628000020980835 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -13.5080000162125
to: -12.5080000162125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.8839999437332
to: 22.9199999570847 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.691125 5.154171 3.648393 0.834620
0.098010 0.100579 0.085387 0.064809 [error]
Peak 0.240487 0.449703 0.518359 0.167044
0.018539 0.023060 0.023549 0.016920 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 43.804 -20.884 22.920
T90 33.720 -18.760 14.960
T50 12.692 -13.320 -0.628
Peak 1.000 -13.508 -12.508
====== 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 -1.633 -0.048 0.048 - - - 2.09e-02 -5.30e-04 5.30e-04 79.990 57
CPL -1.389 -0.187 0.195 135.829 -37.396 238.168 2.71e-02 -4.79e-03 6.12e-03 74.990 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 -1.015 -0.085 0.086 - - - 9.65e-02 -4.96e-03 4.96e-03 58.170 57
CPL -0.629 -0.344 0.373 205.840 -73.634 793.272 1.44e-01 -4.19e-02 6.47e-02 54.480 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 1.32e-06 2.24e-06 2.90e-06 7.52e-06 8.53e-06 1.40e-05 erg/cm2
90%_error_low -6.61e-08 -6.56e-08 -9.07e-08 -5.21e-07 -2.22e-07 -5.73e-07 erg/cm2
90%_error_hi 6.74e-08 6.56e-08 9.04e-08 5.47e-07 2.23e-07 5.91e-07 erg/cm2
Peak flux PL 7.71e-04 1.11e-02 1.03e-01 1.10e+01 4.57e-01 1.09e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.25e-06 2.28e-06 2.95e-06 5.47e-06 8.40e-06 1.20e-05 erg/cm2
90%_error_low -8.46e-08 -7.11e-08 -1.01e-07 -1.14e-06 -2.47e-07 -1.16e-06 erg/cm2
90%_error_hi 8.62e-08 7.16e-08 1.02e-07 1.51e-06 2.46e-07 1.51e-06 erg/cm2
Peak flux CPL 2.27e+00 3.44e+00 3.50e+00 4.10e+00 1.10e+01 1.33e+01 ph/cm2/s
90%_error_low -3.17e-01 -2.31e-01 -2.38e-01 -1.11e+00 -5.93e-01 -1.25e+00 ph/cm2/s
90%_error_hi 3.27e-01 2.34e-01 2.41e-01 1.62e+00 5.93e-01 1.67e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 266.9022 -68.2297 0.0049 34.2185 -38.6316 9.6602545 38.864 TRIG_01142847 Foreground time interval of the image: -13.299 22.920 (delta_t = 36.219 [sec]) Background time interval of the image:
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 -20.884 sec. to 22.920 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63299 ( -0.0476358 0.0476073 ) Norm@50keV : 2.09075E-02 ( -0.000529787 0.000529753 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 79.99 using 59 bins. Reduced chi-squared = 1.40333 # Null hypothesis probability of 2.40e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 43.8 sec: 2.71500 ( -0.07862 0.07891 ) ph/cm2/s Energy fluence (15-150 keV) : 8.53303e-06 ( -2.22395e-07 2.22737e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.884 sec. to 22.920 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38947 ( -0.187071 0.19547 ) Epeak [keV] : 135.829 ( -37.3972 238.167 ) Norm@50keV : 2.71193E-02 ( -0.00479441 0.00612133 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 74.99 using 59 bins. Reduced chi-squared = 1.33911 # Null hypothesis probability of 4.59e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 43.8 sec: 2.66422 ( -0.08673 0.08715 ) ph/cm2/s Energy fluence (15-150 keV) : 8.39585e-06 ( -2.46663e-07 2.45752e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -13.508 sec. to -12.508 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.01451 ( -0.0851776 0.0860821 ) Norm@50keV : 9.65000E-02 ( -0.00496326 0.004957 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.17 using 59 bins. Reduced chi-squared = 1.02053 # Null hypothesis probability of 4.32e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.456917 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.03829e-06 ( -5.72652e-08 5.74058e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.508 sec. to -12.508 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.628913 ( -0.343528 0.373398 ) Epeak [keV] : 205.840 ( -73.6344 793.272 ) Norm@50keV : 0.143608 ( -0.041917 0.0647199 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 54.48 using 59 bins. Reduced chi-squared = 0.972857 # Null hypothesis probability of 5.33e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 10.9978 ( -0.5928 0.593 ) ph/cm2/s Energy fluence (15-150 keV) : 1.02542e-06 ( -5.96583e-08 5.93309e-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 = 5.312556052117654E-01, IMY = 4.245756649878484E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -13.299410 22.920000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5291 -40.5548 56.2 33.2 114.3 -0.0546 -0.2 0.0 Vela X-1 170.4636 -60.4776 4.5 4.0 122.2 0.4228 2.6 9.8 Cen X-3 186.6666 -62.8088 2.0 4.2 -81.2 0.8384 5.8 2.3 GX 301-2 95.6286 -53.5340 2.8 41.2 66.0 1.9002 4.2 ------ UNKNOWN 63.4220 -58.3858 2.3 48.9 42.1 2.9700 5.0 ------ UNKNOWN 152.9869 -23.4125 3.1 42.6 148.3 1.3727 3.8 ------ UNKNOWN 69.2969 -74.8706 2.5 34.9 28.3 0.9191 4.7 ------ UNKNOWN 122.0019 -70.2876 2.5 22.5 49.2 0.8350 4.7 ------ UNKNOWN 266.9022 -68.2297 0.3 34.2 -38.6 9.6580 38.8 ------ UNKNOWN 191.8339 -6.0270 2.0 57.6 -160.5 5.3874 5.6 ------ UNKNOWN 195.1307 -11.8913 3.0 52.3 -155.5 1.8157 3.9 ------ UNKNOWN 214.1379 -29.7618 2.0 40.4 -124.5 2.3881 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 158.300590 830.239400 831.000000 833.909500 835.000000 940.958000 942.000000 963.045400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4508 -60.5959 5.3 38.0 167.1 2.2767 2.2 4.3 Cen X-3 186.5595 -62.7622 1.4 31.3 174.8 6.4980 8.1 2.7 GX 301-2 255.9366 -37.8641 2.2 31.0 -82.4 5.6044 5.2 2.7 4U 1700-377 256.3407 -36.3650 6.2 32.4 -81.4 2.2974 1.9 5.8 GX 349+2 264.6472 -44.6356 0.0 23.6 -69.4 -0.1243 -0.1 11.9 4U 1735-44 270.3211 -24.9375 2.1 43.3 -60.9 12.2037 5.4 8.7 GX 5-1 270.2047 -25.6247 5.2 42.6 -61.0 4.7406 2.2 8.9 GRS 1758-258 275.7564 -30.2820 5.5 38.3 -53.0 2.8224 2.1 10.1 H1820-303 284.8530 -24.8665 11.4 44.7 -42.0 -1.5452 -1.0 10.5 HT1900.1-2455 262.7680 -33.7399 0.0 34.6 -71.5 -2.1311 -1.5 12.4 GX 354-0 327.7949 -70.9172 3.0 20.5 60.0 3.0256 3.8 ------ UNKNOWN 310.4203 -30.9769 2.5 44.9 -8.6 4.2297 4.6 ------ UNKNOWN 188.7730 -35.5829 3.0 53.0 -159.7 7.4803 3.8 ------ UNKNOWN