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 21:15:52 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1297832
======================================================================
Trigger: 01297832 Segment: 000
BAT Trigger Time: 764352408.128 [s; MET]
Trigger Stop: 764352408.192 [s; MET]
UTC: 2025-03-22T16:06:12.837500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 106.733611936176 Dec: 7.19908023351788 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.28
Image Trigger?: NO
Rate S/N Ratio: 41.3158565202272 [ if not an image trigger ]
Image S/N Ratio: 7.28
Analysis Position: [ source = BAT ]
RA: 106.733611936176 Dec: 7.19908023351788 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 106.775539989494 Dec: 7.19660382166839 [deg; J2000]
{ 07h 07m 06.1s , +07d 11' 47.8" }
+/- 1.54442573564378 [arcmin] (estimated 90% radius based on SNR)
+/- 0.529151035928399 [arcmin] (formal 1-sigma fit error)
SNR: 16.3474942923766
Angular difference between the analysis and refined position is 2.500277 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.623999953269958 +/- 0.0486620812716356
Measured from: 0.00399994850158691
to: 0.627999901771545 [s; relative to TRIGTIME]
T50: 0.360000014305115 +/- 0.0481664313780741
Measured from: 0.059999942779541
to: 0.419999957084656 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.162000060081482
to: 0.837999939918518 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.671999931335449 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021371 0.064002 0.069808 0.033601
0.005656 0.006921 0.006516 0.005409 [error]
Peak 0.024670 0.063499 0.072305 0.035072
0.006609 0.007862 0.007158 0.005865 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.672 0.000 0.672
T90 0.624 0.004 0.628
T50 0.360 0.060 0.420
Peak 1.000 -0.162 0.838
====== 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 -0.651 -0.181 0.193 - - - 1.74e-02 -2.03e-03 2.00e-03 74.850 57
CPL -0.016 -0.700 0.911 183.400 -75.583 -183.400 3.30e-02 -1.64e-02 4.58e-02 72.780 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 -0.613 -0.199 0.215 - - - 1.21e-02 -1.57e-03 1.53e-03 68.250 57
CPL -0.212 -0.517 0.953 268.465 -268.465 -268.465 1.80e-02 -7.03e-03 2.55e-02 67.530 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 6.78e-09 2.11e-08 5.36e-08 3.90e-07 1.46e-07 4.72e-07 erg/cm2
90%_error_low -1.57e-09 -3.11e-09 -5.85e-09 -8.95e-08 -1.64e-08 -9.23e-08 erg/cm2
90%_error_hi 1.71e-09 3.06e-09 5.83e-09 1.09e-07 1.64e-08 1.10e-07 erg/cm2
Peak flux PL 2.15e-01 3.68e-01 4.81e-01 1.28e+00 1.41e+00 2.34e+00 ph/cm2/s
90%_error_low -5.65e-02 -6.33e-02 -5.40e-02 -2.87e-01 -1.66e-01 -3.08e-01 ph/cm2/s
90%_error_hi 6.27e-02 6.26e-02 5.39e-02 3.47e-01 1.67e-01 3.33e-01 ph/cm2/s
Fluence CPL 5.77e-09 2.20e-08 5.77e-08 1.77e-07 1.42e-07 2.63e-07 erg/cm2
90%_error_low -1.87e-09 -3.46e-09 -7.47e-09 -9.96e-08 -1.80e-08 -9.86e-08 erg/cm2
90%_error_hi 2.04e-09 3.56e-09 7.60e-09 2.46e-07 1.75e-08 2.05e-07 erg/cm2
Peak flux CPL 1.92e-01 3.75e-01 5.07e-01 8.58e-01 1.40e+00 1.93e+00 ph/cm2/s
90%_error_low -6.88e-02 -6.71e-02 -7.01e-02 -4.39e-01 -1.68e-01 -4.65e-01 ph/cm2/s
90%_error_hi 7.59e-02 6.82e-02 7.39e-02 5.27e-01 1.69e-01 5.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 106.7755 7.1966 0.0117 14.4746 165.8012 0.2048283 16.347 TRIG_01297832 Foreground time interval of the image: 0.000 0.672 (delta_t = 0.672 [sec]) Background time interval of the image: -239.128 0.000 (delta_t = 239.128 [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 0.000 sec. to 0.672 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.651269 ( -0.18078 0.192811 ) Norm@50keV : 1.73790E-02 ( -0.00202864 0.00199605 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 74.85 using 59 bins. Reduced chi-squared = 1.31316 # Null hypothesis probability of 5.65e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 0.672 sec: 2.01758 ( -0.22036 0.22089 ) ph/cm2/s Energy fluence (15-150 keV) : 1.45787e-07 ( -1.63617e-08 1.64235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.672 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0155048 ( -0.700049 0.910639 ) Epeak [keV] : 183.400 ( -75.633 -183.45 ) Norm@50keV : 3.29616E-02 ( -0.016386 0.0458304 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 72.78 using 59 bins. Reduced chi-squared = 1.29964 # Null hypothesis probability of 6.53e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 0.672 sec: 1.98538 ( -0.22425 0.22436 ) ph/cm2/s Energy fluence (15-150 keV) : 1.41684e-07 ( -1.79982e-08 1.75184e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.162 sec. to 0.838 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.61338 ( -0.198976 0.214977 ) Norm@50keV : 1.21101E-02 ( -0.00156494 0.00152755 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 68.25 using 59 bins. Reduced chi-squared = 1.19737 # Null hypothesis probability of 1.46e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.41166 ( -0.16585 0.1665 ) ph/cm2/s Energy fluence (15-150 keV) : 1.5389e-07 ( -1.79836e-08 1.80393e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.162 sec. to 0.838 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.211956 ( -0.51682 0.953025 ) Epeak [keV] : 268.465 ( -268.596 -268.596 ) Norm@50keV : 1.79563E-02 ( -0.00702596 0.025521 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 67.53 using 59 bins. Reduced chi-squared = 1.20589 # Null hypothesis probability of 1.39e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.39737 ( -0.16814 0.16876 ) ph/cm2/s Energy fluence (15-150 keV) : 1.51555e-07 ( -1.93006e-08 1.88177e-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 = -2.502594187900978E-01, IMY = -6.331959160498919E-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: -239.128000 0.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6377 22.0177 0.5 17.8 -81.9 9.5346 23.8 0.3 Crab 129.1510 -16.3541 2.3 45.6 145.2 5.7394 4.9 ------ UNKNOWN 134.4640 29.3759 3.1 29.7 69.3 2.2008 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 0.672000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6053 22.0103 3.9 17.8 -81.9 -0.0399 -3.0 1.6 Crab 106.7755 7.1966 0.7 14.5 165.8 0.2048 16.3 ------ UNKNOWN 102.4844 -30.0240 1.9 51.2 -177.8 0.1928 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 55.772610 716.176200 720.872000 962.992000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6512 22.0255 0.5 26.7 -56.5 36.0869 24.3 1.2 Crab 93.2892 -39.1434 3.1 48.0 -168.6 10.1226 3.7 ------ UNKNOWN 72.4751 14.8105 2.4 34.4 -76.9 10.7029 4.7 ------ UNKNOWN 72.0748 21.4529 1.8 36.3 -65.9 15.3491 6.5 ------ UNKNOWN