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: Thu Jun 19 20:58:21 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1299967
======================================================================
Trigger: 01299967 Segment: 000
BAT Trigger Time: 765088696 [s; MET]
Trigger Stop: 765088760 [s; MET]
UTC: 2025-03-31T04:37:40.659100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 80.9933813960858 Dec: 33.0285181956948 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.76
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.76
Analysis Position: [ source = BAT ]
RA: 80.9933813960858 Dec: 33.0285181956948 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 80.9625554085654 Dec: 33.067618777963 [deg; J2000]
{ 05h 23m 51.0s , +33d 04' 03.4" }
+/- 2.0215451193458 [arcmin] (estimated 90% radius based on SNR)
+/- 0.818398764266459 [arcmin] (formal 1-sigma fit error)
SNR: 11.1282725314239
Angular difference between the analysis and refined position is 2.812008 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 70.0999999046326 +/- 11.7037917883658
Measured from: -8.94799995422363
to: 61.1519999504089 [s; relative to TRIGTIME]
T50: 28.567999958992 +/- 8.61611735633901
Measured from: 6.01199996471405
to: 34.5799999237061 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -3.19200003147125
to: -2.19200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.5880000591278
to: 66.6679999828339 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.480670 0.496151 0.230079 0.076546
0.054605 0.056321 0.046933 0.039371 [error]
Peak 0.016196 0.015308 0.009755 0.013470
0.006404 0.006578 0.005337 0.004493 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 79.256 -12.588 66.668
T90 70.100 -8.948 61.152
T50 28.568 6.012 34.580
Peak 1.000 -3.192 -2.192
====== 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 -1.883 -0.232 0.220 - - - 9.05e-04 -1.42e-04 1.39e-04 52.730 57
CPL -1.005 -1.046 1.488 44.792 -34.432 -44.792 3.05e-03 -3.05e-03 2.20e-02 50.810 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 -1.337 -0.990 1.063 - - - 2.62e-03 -1.22e-03 1.15e-03 59.020 57
CPL -1.378 -0.957 1.277 9999.360 -9999.360 -9999.360 2.59e-03 -2.59e-03 8.49e-03 59.030 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 1.31e-07 1.91e-07 2.07e-07 4.21e-07 6.59e-07 9.51e-07 erg/cm2
90%_error_low -2.26e-08 -2.41e-08 -4.31e-08 -1.50e-07 -1.01e-07 -2.03e-07 erg/cm2
90%_error_hi 2.31e-08 2.41e-08 4.42e-08 1.98e-07 1.03e-07 2.41e-07 erg/cm2
Peak flux PL 9.23e-02 1.02e-01 8.11e-02 1.06e-01 3.15e-01 3.82e-01 ph/cm2/s
90%_error_low -7.08e-02 -1.02e-01 -8.11e-02 -1.06e-01 -3.15e-01 -1.70e-01 ph/cm2/s
90%_error_hi 9.08e-02 5.06e-02 4.28e-02 2.19e-01 1.44e-01 1.81e-01 ph/cm2/s
Fluence CPL 1.25e-07 2.13e-07 1.92e-07 9.37e-08 5.94e-07 6.24e-07 erg/cm2
90%_error_low -2.52e-08 -3.59e-08 -6.31e-08 -7.98e-08 -1.15e-07 -1.43e-07 erg/cm2
90%_error_hi 2.48e-08 3.84e-08 5.33e-08 3.78e-07 1.29e-07 3.70e-07 erg/cm2
Peak flux CPL 9.28e-02 1.03e-01 8.09e-02 1.05e-01 3.18e-01 3.87e-01 ph/cm2/s
90%_error_low N/A -1.03e-01 -3.54e-02 -4.59e-02 -1.46e-01 -1.88e-01 ph/cm2/s
90%_error_hi N/A 4.94e-02 4.30e-02 2.17e-01 1.43e-01 1.76e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 80.9626 33.0676 0.0172 13.0893 159.6101 1.3543795 11.128 TRIG_01299967 Foreground time interval of the image: -12.588 66.668 (delta_t = 79.256 [sec]) Background time interval of the image: -239.000 -12.588 (delta_t = 226.412 [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 -12.588 sec. to 66.668 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.88284 ( -0.232184 0.220071 ) Norm@50keV : 9.04940E-04 ( -0.000141931 0.000138617 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.73 using 59 bins. Reduced chi-squared = 0.925088 # Null hypothesis probability of 6.36e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 79.26 sec: 0.128941 ( -0.01613 0.01613 ) ph/cm2/s Energy fluence (15-150 keV) : 6.59484e-07 ( -1.00622e-07 1.03269e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.588 sec. to 66.668 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00506 ( -1.04628 1.48801 ) Epeak [keV] : 44.7916 ( -34.4263 -44.7862 ) Norm@50keV : 3.04793E-03 ( -0.00305051 0.0219488 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 50.81 using 59 bins. Reduced chi-squared = 0.907321 # Null hypothesis probability of 6.71e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 79.26 sec: 0.125337 ( -0.016712 0.016736 ) ph/cm2/s Energy fluence (15-150 keV) : 5.93532e-07 ( -1.14853e-07 1.29394e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -3.192 sec. to -2.192 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33702 ( -0.990949 1.06244 ) Norm@50keV : 2.62305E-03 ( -0.00121554 0.00114955 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.02 using 59 bins. Reduced chi-squared = 1.03544 # Null hypothesis probability of 4.02e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.315141 ( -0.315141 0.143784 ) ph/cm2/s Energy fluence (15-150 keV) : 2.57022e-08 ( -1.27062e-08 1.29648e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.192 sec. to -2.192 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.23474 ( -0.964562 1.27004 ) Epeak [keV] : 334.556 ( -9999.36 -9999.36 ) Norm@50keV : 3.39468E-04 ( -0.000339367 0.0107487 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.25 using 59 bins. Reduced chi-squared = 1.04018 # Null hypothesis probability of 3.92e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.317909 ( -0.145771 0.143134 ) ph/cm2/s Energy fluence (15-150 keV) : 2.54466e-08 ( -1.26106e-08 1.33604e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 70.1 sec. Hardness ratio (energy fluence ratio) = 1.08465102515
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.226231e-07 S(50-150 keV) = 3.368568e-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 = -2.179413595156088E-01, IMY = -8.100799413055473E-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: -239.000000 -12.588000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6417 22.0190 0.5 24.0 168.7 9.1390 24.5 0.5 Crab 332.2933 59.2657 2.9 57.5 -19.1 5.3423 3.9 ------ UNKNOWN 47.1085 2.3827 2.4 46.7 -128.0 7.5763 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -12.588000 66.668000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7659 22.0697 5.8 24.0 168.4 -0.2638 -2.0 8.1 Crab 80.9625 33.0676 1.0 13.1 159.6 1.3544 11.1 ------ UNKNOWN 80.2457 14.5385 2.0 30.2 -179.6 0.7666 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 118.900600 963.071500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6335 22.0215 0.4 11.3 174.4 33.3754 28.8 0.4 Crab 131.1265 56.1845 2.6 41.2 47.5 13.0586 4.4 ------ UNKNOWN 118.9458 82.1085 2.4 50.9 13.3 10.8931 4.7 ------ UNKNOWN