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 v2.46
Process Start Time: Sun Jan 19 22:40:37 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger324805
======================================================================
Trigger: 00324805 Segment: 000
BAT Trigger Time: 243186818.24 [s; MET]
Trigger Stop: 243186818.368 [s; MET]
UTC: 2008-09-15T15:53:35.140100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 213.078560327715 Dec: -11.4732707538459 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.57
Image Trigger?: NO
Rate S/N Ratio: 23.473389188611 [ if not an image trigger ]
Image S/N Ratio: 10.57
Analysis Position: [ source = BAT ]
RA: 213.078560327715 Dec: -11.4732707538459 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 213.087987204382 Dec: -11.4904661441536 [deg; J2000]
{ 14h 12m 21.1s , -11d 29' 25.7" }
+/- 0.779382872910783 [arcmin] (estimated 90% radius based on SNR)
+/- 0.245163071345694 [arcmin] (formal 1-sigma fit error)
SNR: 43.4270182902908
Angular difference between the analysis and refined position is 1.171194 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 4.05200001597404 +/- 0.607328571222746
Measured from: -0.156000018119812
to: 3.89599999785423 [s; relative to TRIGTIME]
T50: 1.07600000500679 +/- 0.101980397051727
Measured from: 0.412000000476837
to: 1.48800000548363 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.175999999046326
to: 1.17599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.532000005245209
to: 6.14800000190735 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.652910 0.767040 0.428383 0.045302
0.019846 0.021759 0.020417 0.021377 [error]
Peak 0.273363 0.393802 0.244957 0.056357
0.009807 0.011115 0.010015 0.008859 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 6.680 -0.532 6.148
T90 4.052 -0.156 3.896
T50 1.076 0.412 1.488
Peak 1.000 0.176 1.176
====== 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 -1.957 -0.077 0.076 - - - 1.78e-02 -7.85e-04 7.80e-04 71.980 57
CPL -1.439 -0.312 0.338 48.331 -7.594 12.136 3.40e-02 -1.07e-02 1.75e-02 63.500 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.728 -0.067 0.067 - - - 6.41e-02 -2.48e-03 2.48e-03 73.090 57
CPL -1.118 -0.288 0.309 69.220 -9.522 20.859 1.33e-01 -3.78e-02 5.82e-02 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 2.34e-07 3.26e-07 3.36e-07 6.33e-07 1.10e-06 1.53e-06 erg/cm2
90%_error_low -1.46e-08 -1.24e-08 -2.07e-08 -7.83e-08 -4.66e-08 -9.72e-08 erg/cm2
90%_error_hi 1.49e-08 1.24e-08 2.08e-08 8.57e-08 4.69e-08 1.03e-07 erg/cm2
Peak flux PL 3.28e+00 2.89e+00 1.75e+00 1.59e+00 8.60e+00 9.51e+00 ph/cm2/s
90%_error_low -2.06e-01 -1.12e-01 -8.71e-02 -1.56e-01 -3.29e-01 -3.48e-01 ph/cm2/s
90%_error_hi 2.11e-01 1.12e-01 8.69e-02 1.67e-01 3.30e-01 3.48e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -1.46e-08 -1.24e-08 -2.07e-08 -7.83e-08 -4.66e-08 -9.72e-08 erg/cm2
90%_error_hi 1.49e-08 1.24e-08 2.08e-08 8.57e-08 4.69e-08 1.03e-07 erg/cm2
Peak flux CPL 2.95e+00 3.04e+00 1.80e+00 8.12e-01 8.30e+00 8.60e+00 ph/cm2/s
90%_error_low -2.50e-01 -1.33e-01 -9.55e-02 -2.10e-01 -3.54e-01 -4.28e-01 ph/cm2/s
90%_error_hi 2.54e-01 1.35e-01 9.61e-02 2.88e-01 3.55e-01 4.61e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 213.0880 -11.4905 0.0044 32.3197 -26.1081 1.9945508 43.427 TRIG_00324805 Foreground time interval of the image: -0.532 6.148 (delta_t = 6.680 [sec]) Background time interval of the image: -60.240 -0.532 (delta_t = 59.708 [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 -0.532 sec. to 6.148 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.95677 ( -0.0773066 0.0762457 ) Norm@50keV : 1.78414E-02 ( -0.0007852 0.000779724 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.98 using 59 PHA bins. # Reduced chi-squared = 1.263 for 57 degrees of freedom # Null hypothesis probability = 8.740461e-02 Photon flux (15-150 keV) in 6.68 sec: 2.62458 ( -0.10418 0.10441 ) ph/cm2/s Energy fluence (15-150 keV) : 1.0972e-06 ( -4.65814e-08 4.69032e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.532 sec. to 6.148 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43893 ( -0.311962 0.338301 ) Epeak [keV] : 48.3311 ( -7.59376 12.136 ) Norm@50keV : 3.39553E-02 ( -0.0106999 0.0175359 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.50 using 59 PHA bins. # Reduced chi-squared = 1.134 for 56 degrees of freedom # Null hypothesis probability = 2.290997e-01 Photon flux (15-150 keV) in 6.68 sec: 2.53258 ( -0.11635 0.11665 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.176 sec. to 1.176 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72755 ( -0.0672488 0.0667085 ) Norm@50keV : 6.41221E-02 ( -0.00248469 0.00247648 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.09 using 59 PHA bins. # Reduced chi-squared = 1.282 for 57 degrees of freedom # Null hypothesis probability = 7.410017e-02 Photon flux (15-150 keV) in 1 sec: 8.60013 ( -0.32923 0.32977 ) ph/cm2/s Energy fluence (15-150 keV) : 5.92598e-07 ( -2.3876e-08 2.39544e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.176 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11782 ( -0.287999 0.309362 ) Epeak [keV] : 69.2197 ( -9.52155 20.8591 ) Norm@50keV : 0.132538 ( -0.0377865 0.0581496 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.03 using 59 PHA bins. # Reduced chi-squared = 1.054 for 56 degrees of freedom # Null hypothesis probability = 3.653336e-01 Photon flux (15-150 keV) in 1 sec: 8.30291 ( -0.35435 0.3549 ) ph/cm2/s Energy fluence (15-150 keV) : 5.61798e-07 ( -2.76889e-08 2.77511e-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 = 5.681019625274246E-01, IMY = 2.784099831101502E-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: -60.240000 -0.532000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5550 -40.4964 9.7 45.1 -170.2 0.1432 1.2 3.7 Vela X-1 170.5941 -60.6347 4.8 25.9 149.6 -0.1964 -2.4 8.2 Cen X-3 186.6346 -62.6564 6.9 23.3 131.6 0.1457 1.7 6.9 GX 301-2 245.0368 -15.6376 2.7 49.1 15.8 0.9539 4.3 3.3 Sco X-1 256.0396 -37.8918 12.8 46.0 48.6 0.2982 0.9 3.8 4U 1700-377 229.6159 -17.6900 2.7 36.7 3.4 0.4056 4.3 ------ UNKNOWN 199.3564 6.7896 2.5 46.9 -54.3 1.5655 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.532000 6.148000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5066 -40.5455 16.3 45.1 -170.3 0.0480 0.7 1.1 Vela X-1 170.3148 -60.6247 37.4 26.0 149.8 0.0137 0.3 0.1 Cen X-3 186.7850 -62.9028 12.0 23.6 131.2 -0.0463 -1.0 8.7 GX 301-2 245.0751 -15.6864 15.2 49.1 15.8 0.0893 0.8 6.2 Sco X-1 255.9022 -37.7509 7.3 45.9 48.4 0.2691 1.6 6.9 4U 1700-377 213.0880 -11.4905 0.3 32.3 -26.1 1.9945 43.4 ------ UNKNOWN 147.8453 -19.3603 2.5 45.8 -136.9 0.4129 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 185.260600 842.842800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9817 -15.6333 0.6 41.0 -49.2 21.7045 19.6 0.4 Sco X-1 255.9908 -37.8274 0.6 22.1 -79.8 11.3359 20.0 1.0 4U 1700-377 256.6235 -36.5406 4.1 21.8 -76.2 1.5646 2.8 11.5 GX 349+2 263.1484 -24.5762 14.1 22.2 -40.5 0.3922 0.8 12.7 GX 1+4 264.9394 -44.3573 4.1 15.8 -101.5 1.3326 2.8 10.1 4U 1735-44 268.3285 -1.4575 3.4 39.2 -6.7 2.2951 3.4 2.4 SW J1753.5-0127 270.2395 -25.0279 2.3 17.4 -27.7 2.2791 5.0 3.9 GX 5-1 270.1768 -25.7659 2.5 16.9 -29.4 2.0139 4.6 6.9 GRS 1758-258 274.0050 -14.0569 1.6 25.5 -4.5 4.1784 7.2 1.2 GX 17+2 275.9535 -30.3040 2.5 10.2 -25.2 2.1925 4.7 4.1 H1820-303 285.1531 -25.0423 5.1 12.9 23.0 0.9857 2.3 9.7 HT1900.1-2455 288.8290 10.9700 2.0 49.1 24.9 10.0910 5.8 2.3 GRS 1915+105 263.0240 -33.8319 3.8 17.5 -64.2 1.4885 3.0 1.7 GX 354-0 280.6153 -11.4337 1.6 26.7 11.1 3.6442 7.1 ------ UNKNOWN 270.8837 -5.0162 3.7 35.0 -4.6 1.9382 3.1 ------ UNKNOWN