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 11:59:54 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1144698
======================================================================
Trigger: 01144698 Segment: 000
BAT Trigger Time: 692882511.36 [s; MET]
Trigger Stop: 692882512.384 [s; MET]
UTC: 2022-12-16T11:21:20.956420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 326.020902229861 Dec: -34.4050890625163 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 17.832554500127 [ if not an image trigger ]
Image S/N Ratio: 9.84
Analysis Position: [ source = BAT ]
RA: 326.020902229861 Dec: -34.4050890625163 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 326.053443704494 Dec: -34.4140391251465 [deg; J2000]
{ 21h 44m 12.8s , -34d 24' 50.5" }
+/- 1.22589283398037 [arcmin] (estimated 90% radius based on SNR)
+/- 0.379434483945555 [arcmin] (formal 1-sigma fit error)
SNR: 22.7382824354101
Angular difference between the analysis and refined position is 1.697993 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 228.531999945641 +/- 44.2294997864093
Measured from: -11.9960000514984
to: 216.535999894142 [s; relative to TRIGTIME]
T50: 155.999999880791 +/- 4.53429804868911
Measured from: 6.12800002098083
to: 162.127999901772 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.228000044822693
to: 1.22800004482269 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.2960000038147
to: 267.907999992371 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.933583 3.799049 2.365710 0.391913
0.142327 0.147923 0.129169 0.113459 [error]
Peak 0.042749 0.091382 0.070834 0.020001
0.009399 0.010133 0.009269 0.007382 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 306.204 -38.296 267.908
T90 228.532 -11.996 216.536
T50 156.000 6.128 162.128
Peak 1.000 0.228 1.228
====== 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: CPL)
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 -1.677 -0.089 0.088 - - - 1.93e-03 -9.82e-05 9.77e-05 57.400 57
CPL -1.118 -0.372 0.407 76.248 -14.511 54.588 3.73e-03 -1.30e-03 2.24e-03 50.570 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 -1.158 -0.209 0.212 - - - 1.51e-02 -1.89e-03 1.89e-03 43.950 57
CPL -0.535 -0.740 1.060 131.194 -51.502 -131.194 2.92e-02 -1.36e-02 5.64e-02 42.450 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 8.89e-07 1.47e-06 1.84e-06 4.57e-06 5.47e-06 8.76e-06 erg/cm2
90%_error_low -7.13e-08 -7.19e-08 -1.26e-07 -6.38e-07 -2.95e-07 -7.46e-07 erg/cm2
90%_error_hi 7.30e-08 7.19e-08 1.27e-07 7.04e-07 2.97e-07 8.00e-07 erg/cm2
Peak flux PL 4.47e-01 5.52e-01 4.95e-01 7.67e-01 1.76e+00 2.26e+00 ph/cm2/s
90%_error_low -1.03e-01 -8.21e-02 -7.09e-02 -2.07e-01 -2.26e-01 -2.99e-01 ph/cm2/s
90%_error_hi 1.10e-01 8.08e-02 7.00e-02 2.48e-01 2.27e-01 3.06e-01 ph/cm2/s
Fluence CPL 8.10e-07 1.54e-06 1.87e-06 2.04e-06 5.20e-06 6.26e-06 erg/cm2
90%_error_low -8.72e-08 -8.80e-08 -1.36e-07 -7.72e-07 -3.41e-07 -8.48e-07 erg/cm2
90%_error_hi 8.86e-08 8.95e-08 1.37e-07 1.36e-06 3.44e-07 1.39e-06 erg/cm2
Peak flux CPL 3.86e-01 5.76e-01 5.32e-01 4.32e-01 1.72e+00 1.93e+00 ph/cm2/s
90%_error_low -1.29e-01 -9.12e-02 -8.78e-02 -2.30e-01 -2.34e-01 -3.43e-01 ph/cm2/s
90%_error_hi 1.37e-01 9.39e-02 9.07e-02 4.20e-01 2.33e-01 5.00e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 326.0534 -34.4140 0.0085 15.6966 -18.1638 2.9078890 22.738 TRIG_01144698 Foreground time interval of the image: -38.296 11.741 (delta_t = 50.037 [sec]) Background time interval of the image: -239.360 -38.296 (delta_t = 201.064 [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 -38.296 sec. to 267.908 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.67658 ( -0.0894647 0.0884508 ) Norm@50keV : 1.92691E-03 ( -9.82413e-05 9.77392e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.40 using 59 bins. Reduced chi-squared = 1.00702 # Null hypothesis probability of 4.60e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 306.2 sec: 0.253868 ( -0.01247 0.012489 ) ph/cm2/s Energy fluence (15-150 keV) : 5.4744e-06 ( -2.95167e-07 2.97322e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.296 sec. to 267.908 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11779 ( -0.372257 0.406674 ) Epeak [keV] : 76.2478 ( -14.5114 54.5881 ) Norm@50keV : 3.72630E-03 ( -0.00129912 0.00224334 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 50.57 using 59 bins. Reduced chi-squared = 0.903036 # Null hypothesis probability of 6.80e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 306.2 sec: 0.245440 ( -0.013582 0.013597 ) ph/cm2/s Energy fluence (15-150 keV) : 5.20326e-06 ( -3.40693e-07 3.43706e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.228 sec. to 1.228 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15841 ( -0.209287 0.211992 ) Norm@50keV : 1.50695E-02 ( -0.00189184 0.00189127 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.95 using 59 bins. Reduced chi-squared = 0.771053 # Null hypothesis probability of 8.97e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.75920 ( -0.22649 0.22691 ) ph/cm2/s Energy fluence (15-150 keV) : 1.5476e-07 ( -2.13311e-08 2.14619e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.228 sec. to 1.228 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.534878 ( -0.740117 1.05957 ) Epeak [keV] : 131.194 ( -51.502 -131.194 ) Norm@50keV : 2.92007E-02 ( -0.0135784 0.0564217 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 42.45 using 59 bins. Reduced chi-squared = 0.758036 # Null hypothesis probability of 9.09e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.72194 ( -0.23432 0.23305 ) ph/cm2/s Energy fluence (15-150 keV) : 1.50702e-07 ( -2.27138e-08 2.24789e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 228.532 sec. Hardness ratio (energy fluence ratio) = 1.20923306514
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.353793e-06 S(50-150 keV) = 2.8494014e-06
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 = 2.670204085641351E-01, IMY = 8.760484207718193E-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: -239.360000 -38.296000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 306.6117 -1.8629 2.4 52.7 -26.6 7.8640 4.8 ------ UNKNOWN 252.3222 -59.7813 2.4 46.3 -126.3 6.5103 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -38.296000 11.740590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.0534 -34.4140 0.5 15.7 -18.2 2.9078 22.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 59.940600 327.940600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.2359 -24.8363 0.0 36.5 -79.9 0.1075 0.1 12.0 HT1900.1-2455 20.3348 -45.8088 2.7 42.2 128.7 8.0505 4.2 ------ UNKNOWN 24.3125 -72.8575 3.8 48.1 166.4 5.3828 3.1 ------ UNKNOWN 325.9948 -34.4317 1.2 0.0 -142.2 4.6936 9.9 ------ UNKNOWN 322.1972 -28.9872 2.4 6.3 -26.0 2.2820 4.9 ------ UNKNOWN 301.7506 -21.8636 2.5 24.7 -59.8 2.7218 4.6 ------ UNKNOWN 282.0081 -63.3444 2.5 39.5 -144.6 3.3616 4.5 ------ UNKNOWN