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: Wed Oct 19 23:39:31 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger997024
======================================================================
Trigger: 00997024 Segment: 000
BAT Trigger Time: 622469232.268 [s; MET]
Trigger Stop: 622469232.332 [s; MET]
UTC: 2020-09-22T12:06:46.589360 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 296.914828354746 Dec: -55.2037522798755 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.54
Image Trigger?: NO
Rate S/N Ratio: 8.77496438739212 [ if not an image trigger ]
Image S/N Ratio: 10.54
Analysis Position: [ source = BAT ]
RA: 296.914828354746 Dec: -55.2037522798755 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 296.95442118963 Dec: -55.1985713311371 [deg; J2000]
{ 19h 47m 49.1s , -55d 11' 54.9" }
+/- 0.659121136003079 [arcmin] (estimated 90% radius based on SNR)
+/- 0.167201551278991 [arcmin] (formal 1-sigma fit error)
SNR: 55.1746348998346
Angular difference between the analysis and refined position is 1.390912 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 10.3039999008179 +/- 1.95544370890246
Measured from: -0.73199999332428
to: 9.57199990749359 [s; relative to TRIGTIME]
T50: 2.82400000095367 +/- 0.154505599923495
Measured from: 0.103999972343445
to: 2.92799997329712 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.460000038146973
to: 0.539999961853027 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.87999999523163
to: 16.2239999771118 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.956758 2.181040 1.048605 0.182685
0.041545 0.043032 0.035635 0.027078 [error]
Peak 0.373657 0.528448 0.355452 0.057430
0.013944 0.016156 0.013857 0.007887 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 18.104 -1.880 16.224
T90 10.304 -0.732 9.572
T50 2.824 0.104 2.928
Peak 1.000 -0.460 0.540
====== 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 -2.125 -0.057 0.056 - - - 1.73e-02 -5.47e-04 5.45e-04 75.930 57
CPL -1.439 -0.252 0.267 39.136 -6.901 4.715 3.87e-02 -9.75e-03 1.41e-02 52.210 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 -1.729 -0.064 0.064 - - - 8.46e-02 -3.30e-03 3.29e-03 77.380 57
CPL -0.885 -0.286 0.304 69.045 -6.723 10.684 2.18e-01 -5.83e-02 8.60e-02 48.980 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 7.20e-07 9.06e-07 8.31e-07 1.33e-06 2.91e-06 3.79e-06 erg/cm2
90%_error_low -3.57e-08 -2.69e-08 -3.60e-08 -1.18e-07 -8.62e-08 -1.51e-07 erg/cm2
90%_error_hi 3.63e-08 2.68e-08 3.60e-08 1.26e-07 8.64e-08 1.55e-07 erg/cm2
Peak flux PL 4.34e+00 3.81e+00 2.30e+00 2.09e+00 1.14e+01 1.25e+01 ph/cm2/s
90%_error_low -2.76e-01 -1.55e-01 -1.11e-01 -1.95e-01 -4.55e-01 -4.75e-01 ph/cm2/s
90%_error_hi 2.83e-01 1.54e-01 1.11e-01 2.06e-01 4.56e-01 4.76e-01 ph/cm2/s
Fluence CPL 6.35e-07 9.53e-07 8.42e-07 5.57e-07 2.75e-06 2.99e-06 erg/cm2
90%_error_low -4.48e-08 -3.20e-08 -3.95e-08 -1.38e-07 -1.01e-07 -1.76e-07 erg/cm2
90%_error_hi 4.56e-08 3.23e-08 3.94e-08 1.89e-07 1.02e-07 2.17e-07 erg/cm2
Peak flux CPL 4.45e+00 3.29e+00 1.68e+00 1.44e+00 1.00e+01 1.09e+01 ph/cm2/s
90%_error_low -3.30e-01 -2.11e-01 -1.10e-01 -9.69e-02 -6.22e-01 -6.10e-01 ph/cm2/s
90%_error_hi 3.20e-01 2.54e-01 1.13e-01 1.44e-01 7.29e-01 7.04e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 296.9544 -55.1986 0.0035 32.9613 1.6447 5.1864200 55.175 TRIG_00997024 Foreground time interval of the image: -1.880 10.833 (delta_t = 12.713 [sec]) Background time interval of the image: -20.167 -1.880 (delta_t = 18.287 [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 -1.880 sec. to 16.224 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12451 ( -0.0570624 0.0564127 ) Norm@50keV : 1.72613E-02 ( -0.000547172 0.000544994 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 75.93 using 59 bins. Reduced chi-squared = 1.33211 # Null hypothesis probability of 4.76e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 18.1 sec: 2.74922 ( -0.08974 0.09016 ) ph/cm2/s Energy fluence (15-150 keV) : 2.91064e-06 ( -8.62275e-08 8.63698e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.880 sec. to 16.224 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43858 ( -0.25202 0.267449 ) Epeak [keV] : 39.1364 ( -6.90051 4.71449 ) Norm@50keV : 3.86519E-02 ( -0.00974663 0.0140964 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.21 using 59 bins. Reduced chi-squared = 0.932321 # Null hypothesis probability of 6.19e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 18.1 sec: 2.60241 ( -0.10134 0.1021 ) ph/cm2/s Energy fluence (15-150 keV) : 2.75384e-06 ( -1.01445e-07 1.01634e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.460 sec. to 0.540 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72946 ( -0.0643496 0.063622 ) Norm@50keV : 8.45686E-02 ( -0.00330055 0.00329412 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 77.38 using 59 bins. Reduced chi-squared = 1.35754 # Null hypothesis probability of 3.75e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 11.3502 ( -0.4555 0.4564 ) ph/cm2/s Energy fluence (15-150 keV) : 7.81448e-07 ( -3.13984e-08 3.14574e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.460 sec. to 0.540 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.885037 ( -0.285529 0.303718 ) Epeak [keV] : 69.0452 ( -6.72334 10.6835 ) Norm@50keV : 0.217544 ( -0.0583381 0.086016 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 48.98 using 59 bins. Reduced chi-squared = 0.874643 # Null hypothesis probability of 7.35e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 10.0130 ( -0.62216 0.7288 ) ph/cm2/s Energy fluence (15-150 keV) : 7.52991e-07 ( -3.32438e-08 3.32216e-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 = 6.481798389224950E-01, IMY = -1.861139071835446E-02
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: -20.167400 -1.880000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.6766 -44.6046 5.8 51.5 -19.2 0.2819 2.0 9.7 4U 1735-44 277.8521 -36.3838 2.2 55.5 -3.9 0.9583 5.2 ------ UNKNOWN 225.8746 -69.2275 2.3 35.8 -59.6 0.4791 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.880000 10.832580 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.6222 -44.3386 9.8 51.8 -19.1 0.2368 1.2 8.5 4U 1735-44 318.9588 -32.5622 2.8 47.4 38.6 1.1122 4.2 ------ UNKNOWN 296.9544 -55.1986 0.2 33.0 1.6 5.1865 55.2 ------ UNKNOWN 84.8023 -30.7376 2.2 56.9 -174.0 2.0951 5.1 ------ UNKNOWN 89.7772 -31.4861 2.2 57.6 -169.0 2.4470 5.1 ------ UNKNOWN 112.8539 -42.3555 2.6 54.0 -143.5 2.0850 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 64.832590 261.632590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9334 -37.7384 7.0 32.5 -52.0 0.5600 1.6 6.8 4U 1700-377 256.3171 -36.3949 6.3 33.3 -49.8 -0.6202 -1.9 6.0 GX 349+2 263.1379 -24.6670 97.4 39.3 -30.1 0.0406 0.1 8.5 GX 1+4 264.9540 -44.3885 8.8 23.0 -52.5 0.3665 1.3 9.8 4U 1735-44 268.3201 -1.3328 19.4 58.7 -11.2 -0.8282 -0.6 7.7 SW J1753.5-0127 270.3670 -25.1871 3.6 35.8 -21.0 0.9194 3.2 7.9 GX 5-1 270.2494 -25.7026 4.1 35.3 -21.5 0.8371 2.9 3.8 GRS 1758-258 273.9382 -14.1882 158.6 44.7 -9.7 0.0268 0.1 9.9 GX 17+2 275.7593 -30.2736 5.0 29.1 -17.0 0.5560 2.3 10.3 H1820-303 284.9321 -24.8599 12.5 31.6 1.8 -0.2419 -0.9 6.7 HT1900.1-2455 262.8363 -33.7392 5.6 31.9 -39.1 0.6155 2.1 9.5 GX 354-0 316.0308 -15.5154 2.4 42.3 50.8 2.9834 4.8 ------ UNKNOWN 288.7594 -51.4056 2.3 6.2 -32.6 1.1577 5.1 ------ UNKNOWN 267.3568 -2.3723 2.8 58.0 -12.7 4.6323 4.1 ------ UNKNOWN 114.6253 -69.9600 2.5 54.8 -158.1 3.8315 4.7 ------ UNKNOWN 258.8109 -7.0088 2.4 56.9 -24.1 5.2890 4.9 ------ UNKNOWN