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 15:01:08 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger358520
======================================================================
Trigger: 00358520 Segment: 000
BAT Trigger Time: 270427342.976 [s; MET]
Trigger Stop: 270427345.024 [s; MET]
UTC: 2009-07-27T22:42:18.028360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.97210799452 Dec: 64.9160517614425 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.11
Image Trigger?: NO
Rate S/N Ratio: 7.48331477354788 [ if not an image trigger ]
Image S/N Ratio: 8.11
Analysis Position: [ source = BAT ]
RA: 315.97210799452 Dec: 64.9160517614425 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 315.921818678116 Dec: 64.9389225031386 [deg; J2000]
{ 21h 03m 41.2s , +64d 56' 20.1" }
+/- 2.23051518935367 [arcmin] (estimated 90% radius based on SNR)
+/- 1.45813174522031 [arcmin] (formal 1-sigma fit error)
SNR: 9.66933678508391
Angular difference between the analysis and refined position is 1.875634 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 301.879999995232 +/- 22.9214466904804
Measured from: 0.891999959945679
to: 302.771999955177 [s; relative to TRIGTIME]
T50: 119.60799998045 +/- 135.6643635536
Measured from: 147.367999970913
to: 266.975999951363 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.11599999666214
to: 1.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.3400000333786
to: 318.884000003338 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.564599 0.661182 0.735873 0.154237
0.093052 0.098112 0.091003 0.089337 [error]
Peak 0.017544 0.024198 0.023149 0.016732
0.005652 0.006140 0.005852 0.005497 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 320.224 -1.340 318.884
T90 301.880 0.892 302.772
T50 119.608 147.368 266.976
Peak 1.000 0.116 1.116
====== 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 -1.237 -0.239 0.242 - - - 4.38e-04 -5.89e-05 5.88e-05 56.590 57
CPL -0.983 -0.480 1.079 209.063 -209.063 -209.063 5.82e-04 -1.99e-04 1.26e-03 56.370 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 -1.244 -0.536 0.548 - - - 4.40e-03 -1.23e-03 1.21e-03 65.350 57
CPL -1.257 -0.524 0.865 9999.360 -9999.360 -9999.360 4.39e-03 -1.20e-03 1.27e-02 65.360 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 1.40e-07 3.02e-07 5.13e-07 2.00e-06 1.41e-06 2.96e-06 erg/cm2
90%_error_low -3.32e-08 -4.46e-08 -8.78e-08 -6.62e-07 -2.17e-07 -7.35e-07 erg/cm2
90%_error_hi 3.54e-08 4.38e-08 8.68e-08 8.70e-07 2.21e-07 9.15e-07 erg/cm2
Peak flux PL 1.42e-01 1.66e-01 1.40e-01 2.01e-01 5.20e-01 6.49e-01 ph/cm2/s
90%_error_low -6.84e-02 -5.25e-02 -5.02e-02 -1.18e-01 -1.42e-01 -1.89e-01 ph/cm2/s
90%_error_hi 7.80e-02 4.95e-02 4.81e-02 2.02e-01 1.42e-01 2.08e-01 ph/cm2/s
Fluence CPL 1.33e-07 3.10e-07 5.23e-07 1.36e-06 1.38e-06 2.33e-06 erg/cm2
90%_error_low -4.14e-08 -4.98e-08 -9.38e-08 -9.59e-07 -2.41e-07 -9.92e-07 erg/cm2
90%_error_hi 4.03e-08 5.29e-08 9.76e-08 8.24e-07 2.36e-07 1.12e-06 erg/cm2
Peak flux CPL 1.49e-01 1.66e-01 1.37e-01 2.27e-01 5.20e-01 6.82e-01 ph/cm2/s
90%_error_low N/A N/A N/A N/A -1.42e-01 -3.14e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A 1.42e-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 315.9218 64.9389 0.0199 21.0889 147.1399 0.7180291 9.669 TRIG_00358520 Foreground time interval of the image: -1.340 29.725 (delta_t = 31.065 [sec]) Background time interval of the image: -82.275 -1.340 (delta_t = 80.935 [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 -1.340 sec. to 318.884 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23652 ( -0.239354 0.241628 ) Norm@50keV : 4.38081E-04 ( -5.88908e-05 5.87693e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.59 using 59 PHA bins. # Reduced chi-squared = 0.9928 for 57 degrees of freedom # Null hypothesis probability = 4.903321e-01 Photon flux (15-150 keV) in 320.2 sec: 5.17021E-02 ( -0.0069781 0.0069889 ) ph/cm2/s Energy fluence (15-150 keV) : 1.40903e-06 ( -2.16965e-07 2.20605e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.340 sec. to 318.884 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.982891 ( -0.479816 1.0787 ) Epeak [keV] : 209.063 ( -209.058 -209.058 ) Norm@50keV : 5.82383E-04 ( -0.000198532 0.00126255 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.37 using 59 PHA bins. # Reduced chi-squared = 1.007 for 56 degrees of freedom # Null hypothesis probability = 4.611326e-01 Photon flux (15-150 keV) in 320.2 sec: 5.10696E-02 ( -0.0073832 0.0073118 ) ph/cm2/s Energy fluence (15-150 keV) : 1.38016e-06 ( -2.41381e-07 2.3617e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.116 sec. to 1.116 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2443 ( -0.536156 0.548423 ) Norm@50keV : 4.40228E-03 ( -0.00122621 0.00120627 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.35 using 59 PHA bins. # Reduced chi-squared = 1.147 for 57 degrees of freedom # Null hypothesis probability = 2.093578e-01 Photon flux (15-150 keV) in 1 sec: 0.520194 ( -0.141873 0.142139 ) ph/cm2/s Energy fluence (15-150 keV) : 4.41296e-08 ( -1.41739e-08 1.46897e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.116 sec. to 1.116 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25653 ( -0.524904 0.863628 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 4.38886E-03 ( -0.00122885 0.0126858 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.36 using 59 PHA bins. # Reduced chi-squared = 1.167 for 56 degrees of freedom # Null hypothesis probability = 1.836077e-01 Photon flux (15-150 keV) in 1 sec: 0.520109 ( -0.14201 0.142074 ) ph/cm2/s Energy fluence (15-150 keV) : 4.43803e-08 ( -1.76533e-08 7.31844e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 301.88 sec. Hardness ratio (energy fluence ratio) = 1.69761804141
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.424141e-07 S(50-150 keV) = 9.666454e-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 = -3.239411333196693E-01, IMY = -2.092473103160312E-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: -82.275410 -1.340000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0723 40.9567 9.1 40.2 115.8 0.4921 1.3 1.7 Cyg X-3 326.3653 38.3582 40.5 34.8 93.9 -0.0687 -0.3 9.4 Cyg X-2 34.7687 12.6022 2.4 55.2 -2.3 1.7690 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.340000 29.724610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0877 40.9900 9.9 40.2 115.8 -0.3369 -1.2 2.5 Cyg X-3 326.1025 38.3327 46.1 35.0 94.2 -0.0413 -0.2 3.3 Cyg X-2 283.0275 46.7652 2.3 46.3 142.0 1.3647 5.1 ------ UNKNOWN 315.9222 64.9389 1.2 21.1 147.1 0.7182 9.7 ------ UNKNOWN 1.1219 55.7185 2.3 8.8 51.5 0.3110 5.0 ------ UNKNOWN 244.6102 62.9489 2.3 45.8 179.5 0.6681 5.1 ------ UNKNOWN 9.9266 72.7717 2.2 8.7 -140.7 0.3537 5.2 ------ UNKNOWN 37.4428 24.8226 1.9 44.2 -10.1 0.6936 5.9 ------ UNKNOWN 40.8222 32.7775 2.1 37.9 -18.7 0.4882 5.5 ------ UNKNOWN 46.8794 34.8059 2.0 38.2 -27.5 0.5443 5.9 ------ UNKNOWN 60.3645 43.9618 2.3 36.0 -50.3 0.5586 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 72.124600 303.924600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3845 35.3631 22.8 46.5 163.6 0.2722 0.5 3.8 Her X-1 299.5913 35.1912 0.4 31.3 108.4 9.8884 25.7 0.6 Cyg X-1 308.0525 40.9755 5.2 24.4 96.7 0.6029 2.2 3.0 Cyg X-3 326.2633 38.4555 14.3 27.1 64.2 0.2219 0.8 9.1 Cyg X-2 316.8272 45.7732 3.0 19.2 80.2 0.8516 3.8 ------ UNKNOWN 260.5469 40.3532 3.0 39.7 161.4 1.3333 3.9 ------ UNKNOWN 3.4724 36.2927 2.2 39.9 14.2 1.6362 5.2 ------ UNKNOWN 284.0667 51.8160 2.3 20.9 148.5 1.1270 4.9 ------ UNKNOWN 288.5525 54.9880 4.0 16.7 148.7 0.6146 2.9 ------ UNKNOWN 315.8854 64.8742 1.7 0.1 128.4 1.3084 6.8 ------ UNKNOWN 245.9381 67.1926 2.5 27.0 -151.4 0.9430 4.6 ------ UNKNOWN 212.4442 49.7283 2.2 51.2 -151.8 3.0497 5.2 ------ UNKNOWN