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 Mar 9 14:12:09 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1205708
======================================================================
Trigger: 01205708 Segment: 000
BAT Trigger Time: 725811649.984 [s; MET]
Trigger Stop: 725811654.08 [s; MET]
UTC: 2024-01-01T14:20:17.331180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.3487970738741 Dec: 8.52564743491041 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.07
Image Trigger?: NO
Rate S/N Ratio: 11.1803398874989 [ if not an image trigger ]
Image S/N Ratio: 8.07
Analysis Position: [ source = BAT ]
RA: 10.3487970738741 Dec: 8.52564743491041 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 10.3246418468843 Dec: 8.53420238988818 [deg; J2000]
{ 00h 41m 17.9s , +08d 32' 03.1" }
+/- 2.20362004519782 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05387989399937 [arcmin] (formal 1-sigma fit error)
SNR: 9.83836824361692
Angular difference between the analysis and refined position is 1.522423 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 16.4160000085831 +/- 3.3911319061966
Measured from: -4
to: 12.4160000085831 [s; relative to TRIGTIME]
T50: 7.88800001144409 +/- 2.47954844283121
Measured from: -0.351999998092651
to: 7.53600001335144 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.10000002384186
to: 3.10000002384186 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.0239999294281
to: 13.5520000457764 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.248173 0.302174 0.100270 0.015886
0.034946 0.035960 0.030703 0.027018 [error]
Peak 0.040495 0.044915 0.014745 -0.004981
0.008637 0.008726 0.007554 0.006482 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 18.576 -5.024 13.552
T90 16.416 -4.000 12.416
T50 7.888 -0.352 7.536
Peak 1.000 2.100 3.100
====== 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 -2.100 -0.280 0.257 - - - 2.15e-03 -4.25e-04 4.14e-04 53.760 57
CPL -0.393 -1.400 2.022 36.314 -15.546 11.146 2.32e-02 -2.32e-02 3.89e-01 49.190 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 -2.115 -0.458 0.394 - - - 5.96e-03 -1.90e-03 1.84e-03 40.740 57
CPL -0.491 -1.640 2.744 37.205 -37.205 -37.205 5.50e-02 -5.50e-02 2.56e+00 38.290 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 9.01e-08 1.15e-07 1.07e-07 1.76e-07 3.72e-07 4.89e-07 erg/cm2
90%_error_low -1.69e-08 -1.73e-08 -2.76e-08 -7.42e-08 -6.53e-08 -1.13e-07 erg/cm2
90%_error_hi 1.73e-08 1.72e-08 2.88e-08 1.03e-07 6.74e-08 1.35e-07 erg/cm2
Peak flux PL 4.44e-01 3.12e-01 1.44e-01 9.29e-02 9.45e-01 9.93e-01 ph/cm2/s
90%_error_low -1.30e-01 -7.40e-02 -5.64e-02 -5.39e-02 -2.18e-01 -2.33e-01 ph/cm2/s
90%_error_hi 1.36e-01 7.35e-02 5.99e-02 8.51e-02 2.18e-01 2.34e-01 ph/cm2/s
Fluence CPL 8.11e-08 1.39e-07 8.97e-08 1.58e-08 3.24e-07 3.26e-07 erg/cm2
90%_error_low -1.99e-08 -2.60e-08 -3.86e-08 -1.42e-08 -6.13e-08 -6.32e-08 erg/cm2
90%_error_hi 1.95e-08 2.70e-08 3.77e-08 8.62e-08 7.26e-08 1.06e-07 erg/cm2
Peak flux CPL 3.92e-01 3.77e-01 1.36e-01 1.52e-02 9.18e-01 9.20e-01 ph/cm2/s
90%_error_low -1.52e-01 -1.02e-01 -7.27e-02 -1.52e-02 -2.17e-01 -2.18e-01 ph/cm2/s
90%_error_hi 1.52e-01 1.09e-01 7.16e-02 1.00e-01 2.18e-01 2.22e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 10.3246 8.5342 0.0194 33.5211 -145.2458 0.6807146 9.838 TRIG_01205708 Foreground time interval of the image: -5.024 13.552 (delta_t = 18.576 [sec]) Background time interval of the image: -239.984 -5.024 (delta_t = 234.960 [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 -5.024 sec. to 13.552 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.10022 ( -0.280556 0.256778 ) Norm@50keV : 2.15387E-03 ( -0.000424825 0.000414255 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.76 using 59 bins. Reduced chi-squared = 0.943158 # Null hypothesis probability of 5.97e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 18.58 sec: 0.338924 ( -0.04931 0.04931 ) ph/cm2/s Energy fluence (15-150 keV) : 3.71908e-07 ( -6.53271e-08 6.73557e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.024 sec. to 13.552 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.392967 ( -1.41015 2.01188 ) Epeak [keV] : 36.3138 ( -15.5492 11.1418 ) Norm@50keV : 2.31846E-02 ( -0.0237078 0.388397 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.19 using 59 bins. Reduced chi-squared = 0.878393 # Null hypothesis probability of 7.28e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 18.58 sec: 0.324691 ( -0.049982 0.050276 ) ph/cm2/s Energy fluence (15-150 keV) : 3.23725e-07 ( -6.12573e-08 7.25675e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.100 sec. to 3.100 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.11461 ( -0.458132 0.394339 ) Norm@50keV : 5.96207E-03 ( -0.00189705 0.00183537 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 40.74 using 59 bins. Reduced chi-squared = 0.714737 # Null hypothesis probability of 9.49e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.944888 ( -0.218372 0.218382 ) ph/cm2/s Energy fluence (15-150 keV) : 5.54843e-08 ( -1.54115e-08 1.62274e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.100 sec. to 3.100 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.49126 ( -1.64062 2.74402 ) Epeak [keV] : 37.2049 ( -37.2078 -37.2078 ) Norm@50keV : 5.49764E-02 ( -0.0549967 2.55923 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 38.29 using 59 bins. Reduced chi-squared = 0.68375 # Null hypothesis probability of 9.66e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.918089 ( -0.216553 0.218011 ) ph/cm2/s Energy fluence (15-150 keV) : 5.00587e-08 ( -1.38269e-08 1.62942e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 16.416 sec. Hardness ratio (energy fluence ratio) = 0.932996706152
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0513e-07 S(50-150 keV) = 1.6678203e-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 = -5.442445568205163E-01, IMY = 3.776147829377905E-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: -239.984000 -5.024000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 309.2285 88.3690 2.4 50.6 4.1 3.1761 4.9 ------ UNKNOWN 30.6880 51.2084 2.7 12.6 20.3 1.4245 4.2 ------ UNKNOWN 21.6844 1.8683 2.0 37.4 -167.0 2.5904 5.8 ------ UNKNOWN 326.6360 41.2354 3.1 44.4 -61.2 5.2549 3.7 ------ UNKNOWN 354.3110 0.4382 2.3 48.2 -129.3 7.9109 4.9 342.3 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.024000 13.552000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 17.7486 10.4032 2.0 29.5 -157.6 0.3182 5.7 ------ UNKNOWN 10.3246 8.5342 1.2 33.5 -145.2 0.6804 9.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 112.116600 962.040400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.2573 38.4158 2.9 49.6 -22.6 -9.5056 -4.0 6.9 Cyg X-2 11.5637 -17.5508 2.9 26.1 -159.5 4.6536 4.0 ------ UNKNOWN