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 Jun 14 12:32:44 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1119268
======================================================================
Trigger: 01119268 Segment: 000
BAT Trigger Time: 681502149.44 [s; MET]
Trigger Stop: 681502150.464 [s; MET]
UTC: 2022-08-06T18:08:39.809960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 260.873417061978 Dec: -26.0230362270796 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.93
Image Trigger?: NO
Rate S/N Ratio: 14.1774468787578 [ if not an image trigger ]
Image S/N Ratio: 9.93
Analysis Position: [ source = BAT ]
RA: 260.873417061978 Dec: -26.0230362270796 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 260.853751780465 Dec: -26.0236492102056 [deg; J2000]
{ 17h 23m 24.9s , -26d 01' 25.1" }
+/- 2.05369290554543 [arcmin] (estimated 90% radius based on SNR)
+/- 0.957546966420791 [arcmin] (formal 1-sigma fit error)
SNR: 10.8802554055448
Angular difference between the analysis and refined position is 1.060929 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 4.70799994468689 +/- 2.0652602451552
Measured from: -0.0680000782012939
to: 4.6399998664856 [s; relative to TRIGTIME]
T50: 1.75599992275238 +/- 0.837147518388818
Measured from: 0.639999985694885
to: 2.39599990844727 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.763999938964844
to: 1.76399993896484 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.300000071525574
to: 6.66399991512299 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.195070 0.134494 0.016889 0.006139
0.020001 0.017805 0.014548 0.012580 [error]
Peak 0.069060 0.049788 0.009237 0.001297
0.008295 0.007237 0.005633 0.004682 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 6.964 -0.300 6.664
T90 4.708 -0.068 4.640
T50 1.756 0.640 2.396
Peak 1.000 0.764 1.764
====== 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: PL)
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 -2.805 -0.346 0.308 - - - 1.86e-03 -4.94e-04 5.14e-04 40.040 57
CPL -0.204 -1.347 4.306 20.213 -20.213 6.025 1.25e-01 -1.25e-01 1.55e+02 34.060 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
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 -2.867 -0.473 0.394 - - - 4.45e-03 -1.49e-03 1.52e-03 50.840 57
CPL -1.967 -0.027 1.856 1.208 -0.807 22.340 1.75e-02 -6.57e-03 1.02e-02 51.040 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 5.74e-08 4.83e-08 2.76e-08 2.35e-08 1.44e-07 1.57e-07 erg/cm2
90%_error_low -9.12e-09 -8.68e-09 -9.23e-09 -1.19e-08 -2.45e-08 -3.07e-08 erg/cm2
90%_error_hi 9.17e-09 8.48e-09 1.07e-08 1.91e-08 2.59e-08 3.57e-08 erg/cm2
Peak flux PL 6.93e-01 3.15e-01 8.64e-02 2.95e-02 1.11e+00 1.12e+00 ph/cm2/s
90%_error_low -1.37e-01 -6.58e-02 -3.54e-02 -1.75e-02 -1.78e-01 -1.81e-01 ph/cm2/s
90%_error_hi 1.39e-01 6.24e-02 4.13e-02 3.00e-02 1.78e-01 1.81e-01 ph/cm2/s
Fluence CPL 5.69e-08 5.52e-08 8.57e-09 8.36e-11 1.21e-07 1.21e-07 erg/cm2
90%_error_low -1.00e-08 -1.16e-08 -6.91e-09 N/A -1.98e-08 -1.98e-08 erg/cm2
90%_error_hi 9.98e-09 1.14e-08 1.50e-08 N/A 2.30e-08 2.31e-08 erg/cm2
Peak flux CPL 6.59e-01 3.31e-01 7.06e-02 7.89e-03 1.08e+00 1.09e+00 ph/cm2/s
90%_error_low -1.27e-01 -4.91e-02 -3.76e-02 -7.89e-03 -1.74e-01 -1.75e-01 ph/cm2/s
90%_error_hi 8.78e-02 7.11e-02 4.84e-02 1.92e-02 1.74e-01 1.73e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 260.8538 -26.0236 0.0177 5.6916 -49.0121 0.3633903 10.880 TRIG_01119268 Foreground time interval of the image: -0.300 6.664 (delta_t = 6.964 [sec]) Background time interval of the image: -147.939 -0.300 (delta_t = 147.639 [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 -0.300 sec. to 6.664 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.8047 ( -0.34629 0.307569 ) Norm@50keV : 1.86445E-03 ( -0.000494046 0.000513556 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 40.04 using 59 bins. Reduced chi-squared = 0.702456 # Null hypothesis probability of 9.57e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 6.964 sec: 0.446665 ( -0.062169 0.062185 ) ph/cm2/s Energy fluence (15-150 keV) : 1.43618e-07 ( -2.45489e-08 2.58623e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.300 sec. to 6.664 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.418602 ( -1.36784 4.28569 ) Epeak [keV] : 21.6806 ( -20.336 5.90177 ) Norm@50keV : 0.351386 ( -0.343527 154.998 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 33.95 using 59 bins. Reduced chi-squared = 0.60625 # Null hypothesis probability of 9.91e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 6.964 sec: 0.447366 ( -0.062751 0.061858 ) ph/cm2/s Energy fluence (15-150 keV) : 1.20789e-07 ( -1.98363e-08 2.29611e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.764 sec. to 1.764 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.86729 ( -0.472911 0.39443 ) Norm@50keV : 4.44580E-03 ( -0.00148704 0.00152267 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 50.84 using 59 bins. Reduced chi-squared = 0.89193 # Null hypothesis probability of 7.04e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.11231 ( -0.178197 0.17821 ) ph/cm2/s Energy fluence (15-150 keV) : 5.04255e-08 ( -9.98002e-09 1.05717e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.764 sec. to 1.764 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.96683 ( -0.0260542 1.85652 ) Epeak [keV] : 1.20779 ( -0.780747 22.3663 ) Norm@50keV : 1.74946E-02 ( -0.00642967 0.0103788 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 51.04 using 59 bins. Reduced chi-squared = 0.911429 # Null hypothesis probability of 6.63e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.08471 ( -0.174346 0.17363 ) ph/cm2/s Energy fluence (15-150 keV) : 4.70446e-08 ( -9.54989e-09 1.0206e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.708 sec. Hardness ratio (energy fluence ratio) = 0.572558606395
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0568053e-07 S(50-150 keV) = 3.794022e-08
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 = 6.537020839191149E-02, IMY = 7.523190730335999E-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: -147.939380 -0.300000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9858 -15.6644 1.0 23.8 -49.3 3.4506 11.4 1.5 Sco X-1 256.0870 -37.9529 2.7 12.4 -127.9 1.0133 4.3 8.1 4U 1700-377 256.4425 -36.4267 2.9 11.2 -123.2 0.9484 3.9 0.4 GX 349+2 263.0219 -24.7404 18.8 5.2 -24.7 -0.1589 -0.6 0.8 GX 1+4 264.9107 -44.3063 28.3 15.4 -164.8 0.1013 0.4 11.2 4U 1735-44 268.3608 -1.4534 14.6 27.6 15.6 0.2330 0.8 0.4 SW J1753.5-0127 270.2438 -25.2333 5.3 5.1 55.1 0.5230 2.2 9.5 GX 5-1 270.5027 -25.8548 0.0 4.8 62.2 0.1362 0.6 12.7 GRS 1758-258 274.1728 -14.0741 4.1 16.5 38.9 0.7392 2.8 10.0 GX 17+2 276.0104 -30.2937 3.1 8.5 112.7 -1.0419 -3.7 6.2 H1820-303 285.0641 -24.9155 197.7 17.1 92.1 0.0179 0.1 1.6 HT1900.1-2455 288.8775 10.9950 3.7 45.5 43.1 2.1433 3.1 5.5 GRS 1915+105 262.9085 -33.9974 9.8 5.8 -139.4 0.2860 1.2 10.6 GX 354-0 327.8155 -55.3580 3.1 50.5 151.0 3.9773 3.7 ------ UNKNOWN 247.8818 -48.8109 2.1 24.4 -138.3 1.5525 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.300000 6.664000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1306 -15.7155 7.1 23.6 -49.2 0.0676 1.6 9.8 Sco X-1 255.7789 -37.7098 0.0 12.4 -126.2 0.0540 1.6 12.7 4U 1700-377 256.2638 -36.5314 4.4 11.4 -123.1 0.0863 2.6 10.5 GX 349+2 263.0818 -24.8862 4.6 5.0 -25.1 -0.0843 -2.5 9.3 GX 1+4 264.6091 -44.4885 27.8 15.6 -164.1 -0.0144 -0.4 6.2 4U 1735-44 268.2651 -1.5980 7.5 27.4 15.4 0.0596 1.5 10.7 SW J1753.5-0127 270.4515 -25.0754 3.3 5.3 55.5 -0.1245 -3.5 9.1 GX 5-1 270.4831 -25.7799 7.3 4.8 61.4 0.0569 1.6 10.0 GRS 1758-258 273.9715 -13.9161 6.5 16.6 38.0 -0.0617 -1.8 7.5 GX 17+2 275.7374 -30.3449 13.6 8.3 113.3 0.0289 0.8 9.8 H1820-303 285.0317 -24.9057 25.2 17.1 92.0 0.0165 0.5 0.9 HT1900.1-2455 288.7757 10.8118 7.1 45.3 43.1 0.1922 1.6 8.1 GRS 1915+105 262.8400 -33.9993 4.1 5.9 -138.9 0.0893 2.8 12.4 GX 354-0 305.1479 -28.0035 2.3 34.0 109.3 0.3448 5.0 ------ UNKNOWN 261.7225 -23.2284 2.3 7.1 -25.8 0.1574 5.1 ------ UNKNOWN 260.8538 -26.0236 1.1 5.7 -49.0 0.3634 10.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 833.860600 962.600000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 328.3978 -64.7740 2.8 37.7 -1.1 1.0020 4.1 ------ UNKNOWN 15.5223 3.1214 3.4 38.7 -170.8 0.8619 3.4 ------ UNKNOWN 33.1389 7.8074 2.0 52.1 -153.5 2.8290 5.7 ------ UNKNOWN 44.2728 -63.2432 2.9 43.2 -49.5 1.9481 3.9 ------ UNKNOWN 51.2437 -55.8244 2.8 44.4 -61.2 3.7050 4.1 ------ UNKNOWN 46.4872 -34.7707 3.3 40.9 -92.4 3.0329 3.5 ------ UNKNOWN