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: Wed Jan 22 17:55:19 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger202442
======================================================================
Trigger: 00202442 Segment: 000
BAT Trigger Time: 164761222.208 [s; MET]
Trigger Stop: 164761223.232 [s; MET]
UTC: 2006-03-22T23:00:21.120860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.244501992693 Dec: -36.6974174803287 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.93
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 6.93
Analysis Position: [ source = BAT ]
RA: 274.244501992693 Dec: -36.6974174803287 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 274.233938283178 Dec: -36.7082462403164 [deg; J2000]
{ 18h 16m 56.1s , -36d 42' 29.7" }
+/- 1.12008277268499 [arcmin] (estimated 90% radius based on SNR)
+/- 0.377090776256455 [arcmin] (formal 1-sigma fit error)
SNR: 25.8678937848661
Angular difference between the analysis and refined position is 0.824848 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 229.472000002861 +/- 23.4945108472267
Measured from: -19.5200000107288
to: 209.951999992132 [s; relative to TRIGTIME]
T50: 170.784000009298 +/- 3.268028126179
Measured from: 15.7999999821186
to: 186.583999991417 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 182.187999993563
to: 183.187999993563 [s; relative to TRIGTIME]
Total Fluence
Measured from: -51.6240000128746
to: 268.211999982595 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.372754 3.418899 2.394127 0.494201
0.126911 0.114662 0.097387 0.083391 [error]
Peak 0.063242 0.099749 0.068867 0.014059
0.007955 0.007647 0.006749 0.004907 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 319.836 -51.624 268.212
T90 229.472 -19.520 209.952
T50 170.784 15.800 186.584
Peak 1.000 182.188 183.188
====== 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: 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 -1.557 -0.073 0.073 - - - 1.80e-03 -7.36e-05 7.35e-05 60.830 57
CPL -1.066 -0.299 0.321 96.808 -20.078 68.606 3.14e-03 -8.82e-04 1.34e-03 52.590 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 -1.547 -0.155 0.153 - - - 1.61e-02 -1.51e-03 1.50e-03 41.130 57
CPL -0.742 -0.645 0.764 77.086 -17.841 103.084 4.15e-02 -2.17e-02 5.86e-02 36.430 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 7.77e-07 1.38e-06 1.87e-06 5.26e-06 5.42e-06 9.29e-06 erg/cm2
90%_error_low -5.76e-08 -6.15e-08 -9.69e-08 -5.75e-07 -2.35e-07 -6.44e-07 erg/cm2
90%_error_hi 5.90e-08 6.12e-08 9.67e-08 6.23e-07 2.36e-07 6.81e-07 erg/cm2
Peak flux PL 6.95e-01 6.81e-01 4.66e-01 5.01e-01 2.04e+00 2.34e+00 ph/cm2/s
90%_error_low -1.05e-01 -6.61e-02 -5.40e-02 -1.08e-01 -1.90e-01 -2.14e-01 ph/cm2/s
90%_error_hi 1.10e-01 6.57e-02 5.36e-02 1.25e-01 1.91e-01 2.14e-01 ph/cm2/s
Fluence CPL 7.06e-07 1.44e-06 1.93e-06 2.67e-06 5.22e-06 6.74e-06 erg/cm2
90%_error_low -6.99e-08 -7.14e-08 -1.06e-07 -8.29e-07 -2.67e-07 -8.64e-07 erg/cm2
90%_error_hi 7.12e-08 7.23e-08 1.07e-07 1.29e-06 2.67e-07 1.30e-06 erg/cm2
Peak flux CPL 6.03e-01 7.32e-01 4.93e-01 2.22e-01 1.97e+00 2.05e+00 ph/cm2/s
90%_error_low -1.26e-01 -7.92e-02 -6.15e-02 -1.06e-01 -1.99e-01 -2.32e-01 ph/cm2/s
90%_error_hi 1.30e-01 8.17e-02 6.26e-02 2.01e-01 1.99e-01 2.70e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 274.2339 -36.7082 0.0074 30.6032 -15.2296 9.2675058 25.868 TRIG_00202442 Foreground time interval of the image: -51.624 268.212 (delta_t = 319.836 [sec]) Background time interval of the image: -239.208 -51.624 (delta_t = 187.584 [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 -51.624 sec. to 268.212 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.55692 ( -0.0733503 0.0733574 ) Norm@50keV : 1.80277E-03 ( -7.3577e-05 7.3526e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.83 using 59 PHA bins. # Reduced chi-squared = 1.067 for 57 degrees of freedom # Null hypothesis probability = 3.398372e-01 Photon flux (15-150 keV) in 319.8 sec: 0.228687 ( -0.009923 0.00995 ) ph/cm2/s Energy fluence (15-150 keV) : 5.42285e-06 ( -2.34747e-07 2.35614e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.624 sec. to 268.212 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06608 ( -0.298623 0.321473 ) Epeak [keV] : 96.8085 ( -20.0782 68.6054 ) Norm@50keV : 3.14331E-03 ( -0.000882192 0.00134259 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.59 using 59 PHA bins. # Reduced chi-squared = 0.9390 for 56 degrees of freedom # Null hypothesis probability = 6.049091e-01 Photon flux (15-150 keV) in 319.8 sec: 0.221956 ( -0.010664 0.010686 ) ph/cm2/s Energy fluence (15-150 keV) : 5.2153e-06 ( -2.66971e-07 2.66568e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 182.188 sec. to 183.188 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54686 ( -0.154795 0.153124 ) Norm@50keV : 1.61497E-02 ( -0.00150805 0.00150154 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.13 using 59 PHA bins. # Reduced chi-squared = 0.7216 for 57 degrees of freedom # Null hypothesis probability = 9.438451e-01 Photon flux (15-150 keV) in 1 sec: 2.04267 ( -0.19016 0.19053 ) ph/cm2/s Energy fluence (15-150 keV) : 1.52125e-07 ( -1.52229e-08 1.53654e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 182.188 sec. to 183.188 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.741883 ( -0.644939 0.764073 ) Epeak [keV] : 77.0857 ( -17.8404 103.084 ) Norm@50keV : 4.15211E-02 ( -0.0216683 0.0585652 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 36.43 using 59 PHA bins. # Reduced chi-squared = 0.6505 for 56 degrees of freedom # Null hypothesis probability = 9.802027e-01 Photon flux (15-150 keV) in 1 sec: 1.97268 ( -0.19861 0.19858 ) ph/cm2/s Energy fluence (15-150 keV) : 1.43509e-07 ( -1.68226e-08 1.69337e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 229.472 sec. Hardness ratio (energy fluence ratio) = 1.34146735617
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.1420449e-06 S(50-150 keV) = 3.073321e-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 = 5.707016042742225E-01, IMY = 1.553729841290223E-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: -239.208000 -51.624000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9803 -15.6361 0.3 23.8 61.5 11.0118 45.1 0.3 Sco X-1 254.2956 35.2194 48.1 43.8 159.7 0.1035 0.2 10.8 Her X-1 255.9836 -37.7872 2.6 32.8 12.4 1.0454 4.4 3.4 4U 1700-377 256.4148 -36.4095 3.2 31.4 12.7 0.8298 3.6 1.3 GX 349+2 263.0093 -24.7646 2.3 18.5 8.4 0.9380 5.1 1.1 GX 1+4 264.6005 -44.2906 8.7 37.7 -1.2 0.3945 1.3 11.3 4U 1735-44 268.5288 -1.3151 0.0 5.5 -174.1 0.4540 2.3 12.7 SW J1753.5-0127 270.2228 -25.1078 6.2 18.6 -12.3 0.3639 1.9 3.8 GX 5-1 270.1870 -25.8617 3.9 19.3 -11.9 0.6001 3.0 9.5 GRS 1758-258 273.8564 -14.0085 3.3 9.6 -44.6 0.7218 3.5 8.9 GX 17+2 275.7860 -30.3210 4.2 24.8 -21.8 0.5171 2.7 7.7 H1820-303 285.0061 -25.0195 5.3 24.8 -45.1 0.5066 2.2 6.2 HT1900.1-2455 288.8084 10.9528 1.0 27.6 -134.3 3.1217 11.0 0.7 GRS 1915+105 299.5984 35.1943 1.1 51.7 -151.0 6.1863 10.5 0.6 Cyg X-1 262.8770 -33.7913 3.7 27.4 3.8 0.7180 3.1 6.2 GX 354-0 281.7340 -41.5850 3.2 37.1 -22.4 0.9258 3.6 ------ UNKNOWN 291.6437 48.2974 3.0 59.0 -166.1 4.3674 3.8 ------ UNKNOWN 296.9274 46.8339 3.9 59.6 -161.7 4.8846 3.0 ------ UNKNOWN 306.0269 27.2347 3.9 50.4 -138.7 2.9751 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -51.624000 268.212000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0052 -15.6827 1085.1 23.8 61.4 0.0040 0.0 3.0 Sco X-1 254.4540 35.3403 139.1 43.8 159.9 -0.0553 -0.1 0.2 Her X-1 256.0291 -37.9872 5.3 33.0 12.2 0.8335 2.2 8.8 4U 1700-377 256.5825 -36.5220 3.9 31.4 12.4 -1.1360 -3.0 9.2 GX 349+2 262.9943 -24.7927 2.5 18.6 8.4 -1.4343 -4.6 2.9 GX 1+4 264.7387 -44.4546 257.9 37.8 -1.4 0.0193 0.0 0.3 4U 1735-44 268.2150 -1.4920 4.8 5.3 -177.1 0.6947 2.4 9.5 SW J1753.5-0127 270.1873 -24.9243 4.0 18.4 -12.3 0.9130 2.9 10.7 GX 5-1 270.4731 -25.6017 0.0 19.1 -12.8 0.3738 1.1 12.5 GRS 1758-258 274.1600 -14.0325 5.7 9.8 -45.9 0.6442 2.0 9.0 GX 17+2 275.8576 -30.2989 11.9 24.8 -22.0 -0.3243 -1.0 5.4 H1820-303 285.1970 -24.8639 6.3 24.8 -45.7 0.6922 1.8 9.4 HT1900.1-2455 288.9433 10.9535 58.7 27.7 -134.1 -0.0752 -0.2 8.6 GRS 1915+105 299.6803 35.1586 4.0 51.7 -150.9 -3.1723 -2.9 5.1 Cyg X-1 262.8991 -33.6750 6.0 27.3 3.8 -0.6809 -1.9 10.6 GX 354-0 235.7282 -2.7882 2.6 31.9 90.9 2.6157 4.4 ------ UNKNOWN 264.6337 46.3248 1.8 53.1 172.9 7.8786 6.2 ------ UNKNOWN 274.2339 -36.7082 0.4 30.6 -15.2 9.2666 25.9 ------ UNKNOWN 293.8113 13.7373 2.4 33.2 -132.8 2.2063 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 863.992600 962.898200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6424 22.0134 0.4 35.5 33.6 4.1243 26.6 0.5 Crab 34.9461 31.4462 2.7 39.5 -42.4 0.7556 4.2 ------ UNKNOWN 23.5736 20.3153 2.7 39.7 -66.2 1.3573 4.2 ------ UNKNOWN