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 13:00:27 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger231974
======================================================================
Trigger: 00231974 Segment: 000
BAT Trigger Time: 181443811.072 [s; MET]
Trigger Stop: 181443819.264 [s; MET]
UTC: 2006-10-02T01:03:29.592060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.345605609545 Dec: 48.7365696281697 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 9.05538513813742 [ if not an image trigger ]
Image S/N Ratio: 8.16
Analysis Position: [ source = BAT ]
RA: 220.345605609545 Dec: 48.7365696281697 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 220.358870294559 Dec: 48.7292052095614 [deg; J2000]
{ 14h 41m 26.1s , +48d 43' 45.1" }
+/- 1.76765982208087 [arcmin] (estimated 90% radius based on SNR)
+/- 0.765720145403143 [arcmin] (formal 1-sigma fit error)
SNR: 13.4800554571368
Angular difference between the analysis and refined position is 0.686153 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 17.6279999911785 +/- 1.96191027057147
Measured from: -1.59999999403954
to: 16.027999997139 [s; relative to TRIGTIME]
T50: 9.30000001192093 +/- 2.86882830417352
Measured from: 3.08399999141693
to: 12.3840000033379 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.391999989748
to: -0.391999989748001 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.34799998998642
to: 16.8680000007153 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.318130 0.400795 0.284224 0.064711
0.043394 0.040102 0.034606 0.028995 [error]
Peak 0.023881 0.040577 0.021427 0.006217
0.009888 0.008981 0.007854 0.006567 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 19.216 -2.348 16.868
T90 17.628 -1.600 16.028
T50 9.300 3.084 12.384
Peak 1.000 -1.392 -0.392
====== 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 -1.717 -0.204 0.200 - - - 3.89e-03 -4.45e-04 4.41e-04 53.530 57
CPL -1.719 -0.202 0.211 9999.360 -9999.350 -9999.360 3.89e-03 -2.71e-03 3.94e-03 53.540 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 -1.530 -0.524 0.536 - - - 6.46e-03 -1.86e-03 1.85e-03 63.510 57
CPL -1.249 -0.980 2.120 132.501 -132.501 -132.501 8.98e-03 -8.98e-03 1.03e-01 63.510 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 1.17e-07 1.88e-07 2.29e-07 5.48e-07 6.91e-07 1.08e-06 erg/cm2
90%_error_low -2.17e-08 -2.17e-08 -3.48e-08 -1.59e-07 -8.18e-08 -1.90e-07 erg/cm2
90%_error_hi 2.29e-08 2.15e-08 3.44e-08 1.98e-07 8.23e-08 2.19e-07 erg/cm2
Peak flux PL 2.73e-01 2.70e-01 1.87e-01 2.05e-01 8.13e-01 9.36e-01 ph/cm2/s
90%_error_low -1.34e-01 -9.00e-02 -6.56e-02 -1.17e-01 -2.47e-01 -2.67e-01 ph/cm2/s
90%_error_hi 1.59e-01 8.69e-02 6.41e-02 1.91e-01 2.51e-01 2.67e-01 ph/cm2/s
Fluence CPL 1.19e-07 1.88e-07 2.28e-07 5.66e-07 6.96e-07 1.09e-06 erg/cm2
90%_error_low -2.77e-08 -2.15e-08 -4.29e-08 -3.50e-07 -1.03e-07 -3.49e-07 erg/cm2
90%_error_hi 2.57e-08 2.42e-08 4.79e-08 1.22e-08 7.01e-08 2.03e-07 erg/cm2
Peak flux CPL 2.67e-01 2.74e-01 1.89e-01 1.74e-01 8.08e-01 9.05e-01 ph/cm2/s
90%_error_low -1.53e-01 -8.71e-02 -6.74e-02 -1.74e-01 -2.54e-01 -3.27e-01 ph/cm2/s
90%_error_hi 1.66e-01 1.03e-01 7.31e-02 2.13e-01 2.55e-01 2.96e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 220.3589 48.7292 0.0142 46.0938 -13.2474 1.1021629 13.480 TRIG_00231974 Foreground time interval of the image: -2.348 16.868 (delta_t = 19.216 [sec]) Background time interval of the image: -168.371 -2.348 (delta_t = 166.023 [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 -2.348 sec. to 16.868 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.71732 ( -0.203932 0.200371 ) Norm@50keV : 3.88920E-03 ( -0.000445151 0.000440874 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.53 using 59 PHA bins. # Reduced chi-squared = 0.9392 for 57 degrees of freedom # Null hypothesis probability = 6.059017e-01 Photon flux (15-150 keV) in 19.22 sec: 0.519716 ( -0.060023 0.060384 ) ph/cm2/s Energy fluence (15-150 keV) : 6.91326e-07 ( -8.17703e-08 8.22862e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.348 sec. to 16.868 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.71864 ( -0.20257 0.210784 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 3.89009E-03 ( -0.00271595 0.00394027 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.54 using 59 PHA bins. # Reduced chi-squared = 0.9560 for 56 degrees of freedom # Null hypothesis probability = 5.686732e-01 Photon flux (15-150 keV) in 19.22 sec: 0.522195 ( -0.070725 0.064958 ) ph/cm2/s Energy fluence (15-150 keV) : 6.9615e-07 ( -1.02879e-07 7.01224e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -1.392 sec. to -0.392 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52957 ( -0.524193 0.535815 ) Norm@50keV : 6.45949E-03 ( -0.0018598 0.00185338 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.51 using 59 PHA bins. # Reduced chi-squared = 1.114 for 57 degrees of freedom # Null hypothesis probability = 2.578939e-01 Photon flux (15-150 keV) in 1 sec: 0.813003 ( -0.247059 0.251077 ) ph/cm2/s Energy fluence (15-150 keV) : 6.10014e-08 ( -1.84357e-08 1.87485e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.392 sec. to -0.392 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37974 ( -0.963027 2.13668 ) Epeak [keV] : 202.273 ( -143.416 -143.416 ) Norm@50keV : 7.69757E-03 ( -0.00754074 0.104719 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.49 using 59 PHA bins. # Reduced chi-squared = 1.134 for 56 degrees of freedom # Null hypothesis probability = 2.293352e-01 Photon flux (15-150 keV) in 1 sec: 0.807734 ( -0.254086 0.255336 ) ph/cm2/s Energy fluence (15-150 keV) : 6.03768e-08 ( -2.05587e-08 1.92135e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 17.628 sec. Hardness ratio (energy fluence ratio) = 1.21649435853
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.055561e-07 S(50-150 keV) = 3.857477e-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 = 1.011283800457363E+00, IMY = 2.380765705595664E-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: -168.371410 -2.348000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9780 -15.6428 0.2 29.6 -143.1 9.9860 52.5 0.2 Sco X-1 254.4707 35.3506 97.7 23.0 17.4 0.0180 0.1 0.8 Her X-1 256.0088 -37.8426 1.4 50.2 -163.6 3.2834 8.0 1.1 4U 1700-377 256.3285 -36.4811 9.7 48.9 -164.0 0.4343 1.2 6.2 GX 349+2 263.0421 -24.7693 3.8 38.0 -174.6 0.6654 3.0 2.3 GX 1+4 264.5963 -44.4263 239.8 57.5 -170.6 0.0407 0.0 6.4 4U 1735-44 268.3137 -1.4834 3.3 19.4 152.4 0.5264 3.5 3.7 SW J1753.5-0127 270.2148 -24.9427 5.7 40.3 175.7 0.4739 2.0 9.0 GX 5-1 270.3677 -25.5605 0.0 40.9 175.9 0.3691 1.5 11.5 GRS 1758-258 273.8879 -14.0225 4.7 32.6 161.3 0.5798 2.4 6.9 GX 17+2 275.8272 -30.3279 9.8 47.3 172.7 -0.4289 -1.2 5.6 H1820-303 284.9278 -24.9775 9.4 47.6 159.6 -0.5352 -1.2 6.8 HT1900.1-2455 288.8090 10.9474 1.6 33.5 106.6 2.2435 7.0 0.6 GRS 1915+105 262.9184 -33.8356 4.9 46.9 -171.6 0.6891 2.4 3.5 GX 354-0 203.6785 44.8367 2.4 54.0 -25.1 2.4525 4.9 ------ UNKNOWN 237.1724 -25.6136 2.0 41.6 -138.2 1.5270 5.7 ------ UNKNOWN 209.9666 35.3182 2.4 46.3 -34.7 1.6209 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.348000 16.868000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9934 -15.7845 11.5 29.7 -143.2 -0.0495 -1.0 8.7 Sco X-1 254.5496 35.2685 11.9 22.9 17.6 0.0456 1.0 6.3 Her X-1 255.9476 -37.7848 5.3 50.2 -163.6 -0.2214 -2.2 4.0 4U 1700-377 256.5231 -36.4780 18.9 48.9 -164.2 -0.0545 -0.6 5.4 GX 349+2 262.8524 -24.7023 3.6 37.9 -174.4 -0.1908 -3.2 8.9 GX 1+4 264.8087 -44.3786 184.6 57.5 -170.8 -0.0138 -0.1 5.1 4U 1735-44 268.3688 -1.4750 5.5 19.4 152.3 0.0970 2.1 1.3 SW J1753.5-0127 270.4100 -25.0594 5.8 40.5 175.5 0.1334 2.0 6.9 GX 5-1 270.3310 -25.7346 5.5 41.1 176.0 -0.1379 -2.1 1.6 GRS 1758-258 274.0084 -13.9798 5.7 32.6 161.1 -0.1192 -2.0 3.4 GX 17+2 275.8438 -30.3670 3.5 47.4 172.7 0.3297 3.3 4.2 H1820-303 285.0736 -25.0663 4.4 47.8 159.5 -0.3114 -2.6 9.0 HT1900.1-2455 288.9322 11.0291 6.9 33.6 106.4 -0.1422 -1.6 9.3 GRS 1915+105 263.0907 -33.9017 3.2 47.0 -171.8 -0.3073 -3.6 6.5 GX 354-0 220.3589 48.7292 0.9 46.1 -13.2 1.1020 13.5 ------ UNKNOWN 251.6240 -28.5932 2.2 41.1 -158.2 0.3272 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 116.028590 963.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6781 35.2778 0.0 28.5 156.9 -0.6623 -1.3 11.5 Her X-1 206.9047 24.6730 3.3 26.3 -99.9 1.9752 3.5 ------ UNKNOWN 147.7784 30.8455 4.8 56.3 -28.4 5.9593 2.4 ------ UNKNOWN 214.3744 4.2547 2.7 44.8 -119.9 7.8092 4.2 ------ UNKNOWN