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 00:34:24 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1071488
======================================================================
Trigger: 01071488 Segment: 000
BAT Trigger Time: 652201504 [s; MET]
Trigger Stop: 652201568 [s; MET]
UTC: 2021-09-01T15:04:36.348320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 295.292036577501 Dec: -76.9321674594354 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.87
Analysis Position: [ source = BAT ]
RA: 295.292036577501 Dec: -76.9321674594354 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 295.225016721433 Dec: -76.9431579638429 [deg; J2000]
{ 19h 40m 54.0s , -76d 56' 35.4" }
+/- 1.87929105104669 [arcmin] (estimated 90% radius based on SNR)
+/- 0.858856486823977 [arcmin] (formal 1-sigma fit error)
SNR: 12.3508917315787
Angular difference between the analysis and refined position is 1.122865 arcmin
Partial Coding Fraction: 0.1201172 [ including projection effects ]
Duration
T90: 46.7840000391006 +/- 7.71633072634834
Measured from: 31.1759999990463
to: 77.960000038147 [s; relative to TRIGTIME]
T50: 23.055999994278 +/- 6.05163909134497
Measured from: 40.055999994278
to: 63.1119999885559 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 60.6360000371933
to: 61.6360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: 29.7359999418259
to: 84.6319999694824 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.733872 2.127971 1.056017 0.325746
0.157234 0.162905 0.142937 0.131288 [error]
Peak 0.061964 0.168540 0.048588 0.043663
0.022745 0.026885 0.020225 0.019012 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 54.896 29.736 84.632
T90 46.784 31.176 77.960
T50 23.056 40.056 63.112
Peak 1.000 60.636 61.636
====== 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 -2.066 -0.177 0.169 - - - 6.05e-03 -6.98e-04 6.85e-04 49.850 57
CPL -1.495 -0.691 0.877 36.814 -31.722 -36.814 1.30e-02 -7.50e-03 2.96e-02 47.910 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 -2.106 -0.393 0.353 - - - 1.40e-02 -4.36e-03 4.27e-03 70.900 57
CPL 2.807 -3.000 -2.807 36.674 -7.092 9.294 1.55e+01 -1.55e+01 1.34e+06 59.260 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 7.24e-07 9.44e-07 9.02e-07 1.53e-06 3.08e-06 4.10e-06 erg/cm2
90%_error_low -9.52e-08 -8.72e-08 -1.40e-07 -4.24e-07 -3.25e-07 -5.94e-07 erg/cm2
90%_error_hi 9.76e-08 8.73e-08 1.42e-07 5.19e-07 3.30e-07 6.61e-07 erg/cm2
Peak flux PL 1.04e+00 7.30e-01 3.38e-01 2.19e-01 2.21e+00 2.33e+00 ph/cm2/s
90%_error_low -3.62e-01 -2.06e-01 -1.22e-01 -1.15e-01 -6.32e-01 -6.56e-01 ph/cm2/s
90%_error_hi 3.82e-01 2.06e-01 1.24e-01 1.57e-01 6.35e-01 6.56e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -9.52e-08 -8.72e-08 -1.40e-07 -4.24e-07 -3.25e-07 -5.94e-07 erg/cm2
90%_error_hi 9.76e-08 8.73e-08 1.42e-07 5.19e-07 3.30e-07 6.61e-07 erg/cm2
Peak flux CPL 8.01e-01 1.38e+00 1.92e-01 4.16e-04 2.37e+00 2.37e+00 ph/cm2/s
90%_error_low -3.91e-01 -4.43e-01 -1.69e-01 -4.16e-04 -6.26e-01 -6.30e-01 ph/cm2/s
90%_error_hi 4.22e-01 4.35e-01 3.00e-01 4.50e-02 6.28e-01 6.25e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 295.2250 -76.9432 0.0156 47.2375 -44.6527 4.1406216 12.351 TRIG_01071488 Foreground time interval of the image: 29.736 73.301 (delta_t = 43.565 [sec]) Background time interval of the image: -144.499 29.736 (delta_t = 174.235 [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 29.736 sec. to 84.632 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.06608 ( -0.176853 0.168731 ) Norm@50keV : 6.05428E-03 ( -0.00069844 0.000684822 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.85 using 59 bins. Reduced chi-squared = 0.874561 # Null hypothesis probability of 7.38e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 54.9 sec: 0.936936 ( -0.087581 0.087664 ) ph/cm2/s Energy fluence (15-150 keV) : 3.07937e-06 ( -3.2494e-07 3.29825e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 29.736 sec. to 84.632 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49451 ( -0.691901 0.876315 ) Epeak [keV] : 36.8144 ( -31.723 -36.8151 ) Norm@50keV : 1.29630E-02 ( -0.00751068 0.0295694 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.91 using 59 bins. Reduced chi-squared = 0.855536 # Null hypothesis probability of 7.71e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 54.9 sec: 0.917088 ( -0.091054 0.090942 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 60.636 sec. to 61.636 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.10593 ( -0.387491 0.357699 ) Norm@50keV : 1.40055E-02 ( -0.0043504 0.00428514 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 70.90 using 59 bins. Reduced chi-squared = 1.24386 # Null hypothesis probability of 1.02e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.21130 ( -0.63192 0.63472 ) ph/cm2/s Energy fluence (15-150 keV) : 1.30122e-07 ( -3.8183e-08 3.85877e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 60.636 sec. to 61.636 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 4.0747 ( -3.04592 -2.85343 ) Epeak [keV] : 35.4349 ( -6.98901 9.39692 ) Norm@50keV : 107.687 ( -114.624 1.34203e+06 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.12 using 59 bins. Reduced chi-squared = 1.05571 # Null hypothesis probability of 3.62e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.36947 ( -0.62646 0.62805 ) ph/cm2/s Energy fluence (15-150 keV) : 1.20492e-07 ( -3.56599e-08 3.91621e-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 = 7.692286945106462E-01, IMY = 7.599590648781670E-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: -144.499400 29.736000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 9.8549 -0.3670 3.3 39.2 128.2 1.8558 3.5 591.7 UNKNOWN 296.8341 -41.9883 2.4 49.7 2.6 2.1873 4.8 ------ UNKNOWN 16.5283 -36.7909 2.5 10.3 -160.7 0.8687 4.6 ------ UNKNOWN 60.2280 -10.2986 3.0 57.6 -165.4 3.7158 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 29.736000 73.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 317.6714 -66.0190 1.9 37.3 -32.4 0.8808 6.0 ------ UNKNOWN 295.2251 -76.9432 0.9 47.2 -44.7 4.1405 12.4 ------ UNKNOWN 10.0043 -83.6700 2.9 44.6 -62.3 1.7438 3.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 137.900600 710.673600 721.000000 840.300000 841.000000 963.070000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2558 -60.6215 10.9 38.3 -97.2 2.3820 1.1 1.8 Cen X-3 186.6179 -62.7371 3.2 33.7 -86.0 4.8989 3.6 2.3 GX 301-2 255.9180 -37.9713 13.6 42.5 -5.4 -0.9300 -0.9 8.3 4U 1700-377 256.3659 -36.4342 5.1 43.9 -4.4 2.8556 2.3 3.4 GX 349+2 262.9194 -24.7800 12.1 54.4 5.7 -2.9541 -1.0 5.3 GX 1+4 264.7729 -44.4540 12.0 34.8 2.9 1.0011 1.0 1.3 4U 1735-44 270.3286 -25.2208 25.3 53.1 13.9 1.3102 0.5 8.8 GX 5-1 270.2098 -25.7894 7.1 52.5 13.6 4.4006 1.6 5.7 GRS 1758-258 276.1432 -30.4548 0.0 47.3 19.8 -1.5264 -0.9 12.5 H1820-303 284.9071 -24.9615 14.6 52.2 30.5 3.8831 0.8 7.4 HT1900.1-2455 262.8771 -33.8945 9.1 45.4 3.7 -1.6810 -1.3 6.6 GX 354-0 318.2809 -38.0192 6.0 40.1 70.9 6.4377 1.9 ------ UNKNOWN 294.1636 -39.3492 2.9 37.6 41.0 5.4675 4.0 ------ UNKNOWN 280.1840 -33.3432 3.4 44.1 24.2 4.7246 3.4 ------ UNKNOWN 288.9613 -51.4828 3.4 25.5 33.2 2.7543 3.4 ------ UNKNOWN 257.2214 -31.0889 2.5 49.0 -2.0 6.0577 4.7 ------ UNKNOWN 256.4327 -52.3724 2.7 28.5 -11.1 3.1895 4.4 ------ UNKNOWN 255.6378 -78.2979 3.7 8.5 -75.9 2.0038 3.1 ------ UNKNOWN 243.9805 -31.5515 3.0 50.9 -16.6 6.2399 3.9 ------ UNKNOWN 240.4027 -28.6784 3.8 54.4 -19.5 6.8424 3.1 ------ UNKNOWN 240.0567 -28.6165 4.1 54.6 -19.9 6.7151 3.1 ------ UNKNOWN