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 14:56:05 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1250282
======================================================================
Trigger: 01250282 Segment: 000
BAT Trigger Time: 746154239.552 [s; MET]
Trigger Stop: 746154243.648 [s; MET]
UTC: 2024-08-24T01:03:25.505660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 213.203243173578 Dec: 63.7370123171326 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.89
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 9.89
Analysis Position: [ source = BAT ]
RA: 213.203243173578 Dec: 63.7370123171326 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 213.176669085478 Dec: 63.7344625966156 [deg; J2000]
{ 14h 12m 42.4s , +63d 44' 04.1" }
+/- 1.36301958437835 [arcmin] (estimated 90% radius based on SNR)
+/- 0.547278209367549 [arcmin] (formal 1-sigma fit error)
SNR: 19.5421583738244
Angular difference between the analysis and refined position is 0.721956 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 39.4399999380112 +/- 3.42753313033483
Measured from: 0.607999920845032
to: 40.0479998588562 [s; relative to TRIGTIME]
T50: 23.6039999723434 +/- 2.92105462217731
Measured from: 6.30799996852875
to: 29.9119999408722 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0200001001358032
to: 0.979999899864197 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.656000018119812
to: 43.1679999828339 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.468650 0.625097 0.611243 0.187698
0.047510 0.049640 0.042723 0.035570 [error]
Peak 0.016293 0.021458 0.037383 0.021146
0.007293 0.007602 0.006799 0.005453 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 43.824 -0.656 43.168
T90 39.440 0.608 40.048
T50 23.604 6.308 29.912
Peak 1.000 -0.020 0.980
====== 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 -1.316 -0.137 0.139 - - - 2.89e-03 -2.20e-04 2.20e-04 47.330 57
CPL -1.276 -0.178 0.385 984.589 -984.589 -984.589 3.02e-03 -3.38e-04 1.04e-04 47.470 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 -0.846 -0.398 0.446 - - - 5.97e-03 -1.58e-03 1.51e-03 57.460 57
CPL 0.674 -1.687 5.659 119.089 -42.870 -119.089 2.09e-02 -2.09e-02 1.18e+00 56.330 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 1.36e-07 2.80e-07 4.50e-07 1.61e-06 1.25e-06 2.48e-06 erg/cm2
90%_error_low -2.00e-08 -2.50e-08 -4.12e-08 -3.11e-07 -1.02e-07 -3.38e-07 erg/cm2
90%_error_hi 2.09e-08 2.46e-08 4.08e-08 3.60e-07 1.03e-07 3.78e-07 erg/cm2
Peak flux PL 1.32e-01 1.96e-01 2.18e-01 4.59e-01 6.85e-01 1.00e+00 ph/cm2/s
90%_error_low -6.43e-02 -6.76e-02 -4.98e-02 -1.90e-01 -1.72e-01 -2.37e-01 ph/cm2/s
90%_error_hi 8.17e-02 6.75e-02 4.97e-02 2.65e-01 1.76e-01 2.50e-01 ph/cm2/s
Fluence CPL 1.36e-07 2.79e-07 4.45e-07 1.67e-06 1.25e-06 2.47e-06 erg/cm2
90%_error_low -2.00e-08 -2.59e-08 -3.99e-08 -7.65e-07 -1.14e-07 -6.83e-07 erg/cm2
90%_error_hi 2.09e-08 2.75e-08 5.13e-08 1.25e-07 1.08e-07 2.08e-07 erg/cm2
Peak flux CPL 6.86e-02 1.82e-01 2.58e-01 1.93e-01 6.28e-01 7.04e-01 ph/cm2/s
90%_error_low -6.86e-02 -1.02e-01 -7.80e-02 -1.93e-01 -1.95e-01 -2.62e-01 ph/cm2/s
90%_error_hi 1.24e-01 8.13e-02 8.61e-02 3.42e-01 1.99e-01 5.05e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 213.1767 63.7345 0.0099 32.4242 176.2868 1.6736634 19.542 TRIG_01250282 Foreground time interval of the image: -0.656 35.549 (delta_t = 36.205 [sec]) Background time interval of the image: -239.552 -0.656 (delta_t = 238.896 [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 -0.656 sec. to 43.168 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3164 ( -0.137407 0.138946 ) Norm@50keV : 2.89025E-03 ( -0.000219858 0.00021985 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.33 using 59 bins. Reduced chi-squared = 0.830351 # Null hypothesis probability of 8.16e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 43.82 sec: 0.345882 ( -0.02794 0.028044 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24676e-06 ( -1.0232e-07 1.02803e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.656 sec. to 43.168 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.31269 ( -0.178015 0.38543 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 2.90209E-03 ( -0.000220729 0.000220733 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.35 using 59 bins. Reduced chi-squared = 0.845536 # Null hypothesis probability of 7.88e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 43.82 sec: 0.345822 ( -0.02794 0.028014 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24952e-06 ( -1.13796e-07 1.08427e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.020 sec. to 0.980 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.845616 ( -0.398427 0.445982 ) Norm@50keV : 5.96656E-03 ( -0.00157938 0.00151278 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.46 using 59 bins. Reduced chi-squared = 1.00807 # Null hypothesis probability of 4.58e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.684949 ( -0.172287 0.175993 ) ph/cm2/s Energy fluence (15-150 keV) : 6.84305e-08 ( -1.579e-08 1.57943e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.980 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.674135 ( -1.73196 5.61404 ) Epeak [keV] : 119.089 ( -41.0004 -117.219 ) Norm@50keV : 2.08927E-02 ( -0.0221895 1.17788 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.33 using 59 bins. Reduced chi-squared = 1.00589 # Null hypothesis probability of 4.63e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.628201 ( -0.1951 0.199153 ) ph/cm2/s Energy fluence (15-150 keV) : 6.62567e-08 ( -1.80208e-08 1.66673e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 39.44 sec. Hardness ratio (energy fluence ratio) = 1.60620115235
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.162435e-07 S(50-150 keV) = 8.305145e-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 = -6.338793116353315E-01, IMY = -4.113737309992058E-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: -239.552000 -0.656000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6087 22.0279 1.0 53.5 4.5 8.6583 11.4 1.6 Crab 74.2882 62.4872 3.2 25.7 55.5 1.4811 3.6 ------ UNKNOWN 84.3655 33.4313 4.2 43.0 10.5 1.3734 2.7 ------ UNKNOWN 219.5196 45.7843 3.0 48.0 -168.6 2.7213 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.656000 35.548610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7509 22.0641 5.8 53.4 4.4 0.5431 2.0 7.2 Crab 213.1767 63.7345 0.6 32.4 176.3 1.6739 19.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 116.548600 962.608000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4482 35.3400 297.7 37.8 141.8 0.0876 0.0 0.5 Her X-1 255.8824 30.1538 2.2 43.0 143.8 15.4552 5.2 ------ UNKNOWN 225.6226 32.7795 3.0 31.9 -176.9 4.7329 3.8 ------ UNKNOWN 96.3628 70.6416 2.7 38.7 -5.1 5.6289 4.3 ------ UNKNOWN 219.9110 11.4401 2.9 52.5 -165.2 12.1185 4.0 ------ UNKNOWN