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 14:57:44 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1248132
======================================================================
Trigger: 01248132 Segment: 000
BAT Trigger Time: 745078087.168 [s; MET]
Trigger Stop: 745078088.192 [s; MET]
UTC: 2024-08-11T14:07:33.195260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 226.373405898408 Dec: 28.8543974887752 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 8.88819441731559 [ if not an image trigger ]
Image S/N Ratio: 7.37
Analysis Position: [ source = BAT ]
RA: 226.373405898408 Dec: 28.8543974887752 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 226.339388248182 Dec: 28.9012719789403 [deg; J2000]
{ 15h 05m 21.5s , +28d 54' 04.6" }
+/- 1.24579444925927 [arcmin] (estimated 90% radius based on SNR)
+/- 0.511201571849539 [arcmin] (formal 1-sigma fit error)
SNR: 22.2211428934804
Angular difference between the analysis and refined position is 3.332307 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 62.9119999408722 +/- 4.673576857007
Measured from: -29.3479999303818
to: 33.5640000104904 [s; relative to TRIGTIME]
T50: 14.539999961853 +/- 2.16989216241401
Measured from: 2.65600001811981
to: 17.1959999799728 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.3040000200272
to: 12.3040000200272 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.8639999628067
to: 41.2439999580383 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.458252 1.881269 1.233476 0.193032
0.078109 0.069946 0.058310 0.048005 [error]
Peak 0.085871 0.134452 0.109214 0.023419
0.010426 0.010196 0.009132 0.006781 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 76.108 -34.864 41.244
T90 62.912 -29.348 33.564
T50 14.540 2.656 17.196
Peak 1.000 11.304 12.304
====== 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 -1.713 -0.082 0.082 - - - 4.18e-03 -1.92e-04 1.91e-04 54.320 57
CPL -1.391 -0.308 0.332 93.515 -25.209 494.999 6.08e-03 -1.78e-03 2.78e-03 51.080 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 -1.531 -0.147 0.145 - - - 2.34e-02 -2.05e-03 2.05e-03 71.950 57
CPL -0.906 -0.580 0.672 91.212 -24.497 350.708 4.72e-02 -2.22e-02 5.15e-02 68.530 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 4.97e-07 8.02e-07 9.78e-07 2.34e-06 2.95e-06 4.62e-06 erg/cm2
90%_error_low -3.88e-08 -3.78e-08 -5.88e-08 -2.92e-07 -1.40e-07 -3.38e-07 erg/cm2
90%_error_hi 3.98e-08 3.77e-08 5.88e-08 3.19e-07 1.40e-07 3.59e-07 erg/cm2
Peak flux PL 9.91e-01 9.79e-01 6.77e-01 7.40e-01 2.94e+00 3.39e+00 ph/cm2/s
90%_error_low -1.44e-01 -9.16e-02 -7.33e-02 -1.51e-01 -2.62e-01 -2.93e-01 ph/cm2/s
90%_error_hi 1.51e-01 9.09e-02 7.27e-02 1.71e-01 2.62e-01 2.94e-01 ph/cm2/s
Fluence CPL 4.69e-07 8.25e-07 9.93e-07 1.46e-06 2.87e-06 3.74e-06 erg/cm2
90%_error_low -4.64e-08 -4.39e-08 -6.23e-08 -5.05e-07 -1.58e-07 -5.29e-07 erg/cm2
90%_error_hi 4.72e-08 4.46e-08 6.29e-08 8.33e-07 1.58e-07 8.37e-07 erg/cm2
Peak flux CPL 8.73e-01 1.03e+00 7.20e-01 4.07e-01 2.86e+00 3.03e+00 ph/cm2/s
90%_error_low -1.77e-01 -1.05e-01 -8.51e-02 -1.74e-01 -2.72e-01 -3.36e-01 ph/cm2/s
90%_error_hi 1.84e-01 1.08e-01 8.72e-02 3.10e-01 2.72e-01 4.00e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 226.3394 28.9013 0.0086 33.0107 -23.3286 3.0169641 22.221 TRIG_01248132 Foreground time interval of the image: -34.864 11.333 (delta_t = 46.197 [sec]) Background time interval of the image: -128.667 -34.864 (delta_t = 93.803 [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 -34.864 sec. to 41.244 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.71347 ( -0.0820577 0.0816449 ) Norm@50keV : 4.18383E-03 ( -0.000191589 0.000191086 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 54.32 using 59 bins. Reduced chi-squared = 0.952982 # Null hypothesis probability of 5.76e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 76.11 sec: 0.558325 ( -0.02654 0.026618 ) ph/cm2/s Energy fluence (15-150 keV) : 2.94572e-06 ( -1.39891e-07 1.40318e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.864 sec. to 41.244 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39092 ( -0.307563 0.332006 ) Epeak [keV] : 93.5152 ( -25.2087 494.998 ) Norm@50keV : 6.08426E-03 ( -0.0017816 0.00278104 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 51.08 using 59 bins. Reduced chi-squared = 0.912143 # Null hypothesis probability of 6.61e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 76.11 sec: 0.547264 ( -0.028443 0.028498 ) ph/cm2/s Energy fluence (15-150 keV) : 2.86894e-06 ( -1.57992e-07 1.57703e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.304 sec. to 12.304 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53134 ( -0.147308 0.145253 ) Norm@50keV : 2.33665E-02 ( -0.0020535 0.00204693 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 71.95 using 59 bins. Reduced chi-squared = 1.26228 # Null hypothesis probability of 8.77e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.94242 ( -0.26183 0.26239 ) ph/cm2/s Energy fluence (15-150 keV) : 2.20607e-07 ( -2.07681e-08 2.09168e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.304 sec. to 12.304 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.906438 ( -0.579934 0.672243 ) Epeak [keV] : 91.2121 ( -24.4971 350.708 ) Norm@50keV : 4.72094E-02 ( -0.0222241 0.0514989 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 68.53 using 59 bins. Reduced chi-squared = 1.22375 # Null hypothesis probability of 1.21e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.86327 ( -0.2721 0.27229 ) ph/cm2/s Energy fluence (15-150 keV) : 2.13359e-07 ( -2.23077e-08 2.22164e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 62.912 sec. Hardness ratio (energy fluence ratio) = 1.21971862989
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2988195e-06 S(50-150 keV) = 1.6469141e-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 = 5.965619257236635E-01, IMY = 2.572726785250722E-01
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: -128.667400 -34.864000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9883 -15.6333 0.3 15.2 146.4 7.0406 38.4 0.7 Sco X-1 254.4575 35.3422 82.0 40.9 16.1 -0.0448 -0.1 0.0 Her X-1 255.9685 -37.7091 12.3 39.2 151.6 0.3697 0.9 8.1 4U 1700-377 256.6103 -36.2617 0.0 38.2 149.7 1.0016 2.6 12.9 GX 349+2 262.9234 -24.6171 7.2 33.1 129.4 0.5572 1.6 9.0 GX 1+4 264.9245 -44.2705 4.4 48.4 148.7 1.9345 2.6 13.3 4U 1735-44 268.5101 -1.5946 0.0 31.0 84.1 0.1772 0.5 12.1 SW J1753.5-0127 270.2558 -24.9803 193.6 38.8 123.5 -0.0389 -0.1 6.1 GX 5-1 270.2312 -25.8695 7.0 39.3 124.7 1.0814 1.7 8.5 GRS 1758-258 274.1566 -14.0313 7.5 38.0 104.9 0.9327 1.5 8.8 GX 17+2 263.0079 -33.8593 48.7 39.5 140.7 0.1275 0.2 1.7 GX 354-0 249.0192 -51.0199 2.6 49.7 165.4 2.7815 4.5 ------ UNKNOWN 232.0822 -11.7983 3.9 10.9 -155.7 0.5285 2.9 ------ UNKNOWN 193.8183 -28.8491 2.0 49.3 -132.2 5.5533 5.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -34.864000 11.332600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9788 -15.6311 5.9 15.2 146.5 -0.2036 -2.0 0.5 Sco X-1 254.6152 35.4610 10.5 41.0 16.2 0.2116 1.1 10.5 Her X-1 256.1305 -37.9737 0.0 39.5 151.6 0.5491 2.6 10.3 4U 1700-377 256.3073 -36.5797 7.4 38.4 150.3 -0.3140 -1.6 11.2 GX 349+2 263.0807 -24.6019 4.4 33.2 129.2 -0.4654 -2.6 9.5 GX 1+4 264.8614 -44.5697 12.3 48.6 149.0 -0.3886 -0.9 8.8 4U 1735-44 268.5215 -1.3921 6.0 31.0 83.7 -0.3883 -1.9 9.9 SW J1753.5-0127 270.3008 -25.0302 5.1 38.9 123.5 0.6760 2.3 3.1 GX 5-1 270.2468 -25.7317 5.5 39.2 124.5 -0.6463 -2.1 3.1 GRS 1758-258 273.9764 -14.0642 5.9 37.9 105.0 -0.6506 -2.0 2.4 GX 17+2 263.1525 -33.7692 5.3 39.5 140.5 0.5224 2.2 9.0 GX 354-0 249.5711 10.3686 2.6 17.4 38.0 0.4526 4.4 ------ UNKNOWN 237.5459 29.1022 2.7 31.4 -5.1 0.5080 4.2 ------ UNKNOWN 226.3394 28.9013 0.5 33.0 -23.3 3.0175 22.2 ------ UNKNOWN 216.5288 -42.2369 2.5 44.1 -162.7 0.8330 4.5 ------ UNKNOWN 216.3657 23.8596 2.3 33.3 -42.1 0.6668 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 83.132590 962.963700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9833 -15.6434 1.1 48.0 145.0 47.7400 10.7 0.3 Sco X-1 254.4042 35.3603 3.6 24.5 56.9 4.4982 3.2 2.8 Her X-1 280.4144 45.1015 2.2 45.2 43.1 11.9190 5.3 ------ UNKNOWN 281.5037 63.8542 2.3 49.2 18.0 7.8630 5.1 ------ UNKNOWN 233.5351 25.8989 2.6 7.0 102.8 4.2097 4.4 ------ UNKNOWN 195.5827 -4.7946 2.6 44.8 -144.2 9.7945 4.5 ------ UNKNOWN 184.5626 5.6531 2.7 45.8 -122.8 21.3498 4.2 ------ UNKNOWN 181.6374 19.1830 3.1 41.8 -103.7 18.1636 3.7 ------ UNKNOWN