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: Sat Oct 19 15:16:03 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1230423
======================================================================
Trigger: 01230423 Segment: 000
BAT Trigger Time: 738168225.408 [s; MET]
Trigger Stop: 738168229.504 [s; MET]
UTC: 2024-05-23T14:43:11.908720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.5671478971774 Dec: -22.0204592880628 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.5
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 8.5
Analysis Position: [ source = BAT ]
RA: 33.5671478971774 Dec: -22.0204592880628 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 33.5367072741935 Dec: -22.0515412262457 [deg; J2000]
{ 02h 14m 08.8s , -22d 03' 05.5" }
+/- 1.62362450435195 [arcmin] (estimated 90% radius based on SNR)
+/- 0.772795992880624 [arcmin] (formal 1-sigma fit error)
SNR: 15.2203510610822
Angular difference between the analysis and refined position is 2.518771 arcmin
Partial Coding Fraction: 0.4726562 [ including projection effects ]
Duration
T90: 41.9319999217987 +/- 8.65178382544062
Measured from: -3.92799997329712
to: 38.0039999485016 [s; relative to TRIGTIME]
T50: 23.1159999370575 +/- 5.50600587724988
Measured from: 3.35600006580353
to: 26.472000002861 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.184000015258789
to: 1.18400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.36800003051758
to: 46.2999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.754100 0.740629 0.432950 0.000600
0.067872 0.070286 0.059797 0.050944 [error]
Peak 0.034018 0.045506 0.026948 0.004316
0.009673 0.010416 0.008529 0.006949 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 52.668 -6.368 46.300
T90 41.932 -3.928 38.004
T50 23.116 3.356 26.472
Peak 1.000 0.184 1.184
====== 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 -2.072 -0.204 0.191 - - - 2.29e-03 -2.97e-04 2.90e-04 63.840 57
CPL -1.580 -0.505 0.896 38.558 -20.129 -38.558 4.26e-03 -2.28e-03 8.69e-03 62.650 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 -1.847 -0.525 0.463 - - - 7.11e-03 -2.17e-03 2.01e-03 37.410 57
CPL -1.846 -1.170 0.939 9999.230 N/A N/A 7.12e-03 N/A N/A 37.410 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 2.64e-07 3.43e-07 3.27e-07 5.51e-07 1.12e-06 1.49e-06 erg/cm2
90%_error_low -3.89e-08 -3.52e-08 -5.75e-08 -1.72e-07 -1.32e-07 -2.41e-07 erg/cm2
90%_error_hi 4.02e-08 3.52e-08 5.80e-08 2.15e-07 1.34e-07 2.71e-07 erg/cm2
Peak flux PL 4.09e-01 3.35e-01 1.86e-01 1.52e-01 9.98e-01 1.08e+00 ph/cm2/s
90%_error_low -1.59e-01 -8.69e-02 -7.26e-02 -9.20e-02 -2.59e-01 -2.76e-01 ph/cm2/s
90%_error_hi 1.72e-01 8.62e-02 6.95e-02 1.41e-01 2.59e-01 2.76e-01 ph/cm2/s
Fluence CPL 2.49e-07 3.63e-07 3.29e-07 2.64e-07 1.08e-06 1.21e-06 erg/cm2
90%_error_low -4.66e-08 -4.41e-08 -6.21e-08 -1.73e-07 -1.41e-07 -2.32e-07 erg/cm2
90%_error_hi 4.55e-08 4.77e-08 6.23e-08 4.84e-07 1.45e-07 5.27e-07 erg/cm2
Peak flux CPL 3.90e-01 2.74e-01 1.33e-01 1.05e-01 8.40e-01 9.04e-01 ph/cm2/s
90%_error_low -1.94e-01 -1.37e-01 -1.33e-01 -1.05e-01 -4.19e-01 -4.57e-01 ph/cm2/s
90%_error_hi 1.82e-01 1.39e-01 8.34e-02 6.64e-02 4.08e-01 4.47e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 33.5367 -22.0515 0.0126 42.6071 -5.2734 1.8097747 15.220 TRIG_01230423 Foreground time interval of the image: -6.368 36.693 (delta_t = 43.061 [sec]) Background time interval of the image: -239.408 -6.368 (delta_t = 233.040 [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 -6.368 sec. to 46.300 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.07199 ( -0.203974 0.19118 ) Norm@50keV : 2.29059E-03 ( -0.000297467 0.000289584 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 63.84 using 59 bins. Reduced chi-squared = 1.12 # Null hypothesis probability of 2.49e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 52.67 sec: 0.355495 ( -0.036831 0.036872 ) ph/cm2/s Energy fluence (15-150 keV) : 1.11829e-06 ( -1.31775e-07 1.33592e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.368 sec. to 46.300 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5803 ( -0.504552 0.896187 ) Epeak [keV] : 38.5577 ( -20.1288 -38.5571 ) Norm@50keV : 4.25578E-03 ( -0.00227765 0.00869283 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 62.65 using 59 bins. Reduced chi-squared = 1.11875 # Null hypothesis probability of 2.52e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 52.67 sec: 0.348216 ( -0.038673 0.038554 ) ph/cm2/s Energy fluence (15-150 keV) : 1.08077e-06 ( -1.40804e-07 1.44925e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.184 sec. to 1.184 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84743 ( -0.525137 0.462978 ) Norm@50keV : 7.10883E-03 ( -0.00217072 0.00200764 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 37.41 using 59 bins. Reduced chi-squared = 0.656316 # Null hypothesis probability of 9.79e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.998237 ( -0.259189 0.259333 ) ph/cm2/s Energy fluence (15-150 keV) : 6.53762e-08 ( -1.90091e-08 1.91906e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.184 sec. to 1.184 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.75864 ( -0.257004 1.85107 ) Epeak [keV] : 247.690 ( ) Norm@50keV : 2.56696E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 36.84 using 59 bins. Reduced chi-squared = 0.657857 # Null hypothesis probability of 9.78e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.840004 ( -0.419309 0.407806 ) ph/cm2/s Energy fluence (15-150 keV) : 5.68683e-08 ( -2.8179e-08 2.10662e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 41.932 sec. Hardness ratio (energy fluence ratio) = 0.951370981149
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.078121e-07 S(50-150 keV) = 5.104777e-07
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 = 9.158820703909174E-01, IMY = 8.453446961476060E-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: -239.408000 -6.368000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.0528 38.3766 4.2 46.2 156.5 -2.8386 -2.7 6.5 Cyg X-2 23.3337 46.5308 2.3 33.8 -138.1 1.9228 5.1 ------ UNKNOWN 52.8454 1.5870 2.1 43.3 -50.3 3.8556 5.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.368000 36.692600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.0549 38.2558 7.9 46.2 156.3 0.3085 1.5 6.8 Cyg X-2 326.9220 28.3310 2.3 43.0 142.9 1.0183 5.1 ------ UNKNOWN 4.6341 15.6406 2.1 6.2 129.5 0.3860 5.5 ------ UNKNOWN 33.5367 -22.0515 0.8 42.6 -5.3 1.8105 15.2 ------ UNKNOWN 355.5328 48.9598 3.6 36.9 -170.4 0.2911 3.2 ------ UNKNOWN 28.2578 19.3063 2.4 17.3 -82.6 0.4002 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 130.492640 962.728000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 99.1114 -34.3732 2.8 58.1 -5.9 14.8658 4.2 ------ UNKNOWN