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: Thu Sep 11 11:42:49 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger420247
======================================================================
Trigger: 00420247 Segment: 000
BAT Trigger Time: 293675704.896 [s; MET]
Trigger Stop: 293675705.92 [s; MET]
UTC: 2010-04-23T00:34:59.164220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 136.477016071933 Dec: 21.4794761790139 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.49
Image Trigger?: NO
Rate S/N Ratio: 116.228223766863 [ if not an image trigger ]
Image S/N Ratio: 21.49
Analysis Position: [ source = BAT ]
RA: 136.477016071933 Dec: 21.4794761790139 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 136.472342171038 Dec: 21.4826479030353 [deg; J2000]
{ 09h 05m 53.4s , +21d 28' 57.5" }
+/- 0.61797808747846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.21655965168157 [arcmin] (formal 1-sigma fit error)
SNR: 60.4962244695789
Angular difference between the analysis and refined position is 0.322975 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 78.8679999709129 +/- 4.15788408231418
Measured from: 0.12799996137619
to: 78.9959999322891 [s; relative to TRIGTIME]
T50: 39.2599999904633 +/- 2.26823990358931
Measured from: 4.06399995088577
to: 43.323999941349 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.155999958515167
to: 1.15599995851517 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.80000001192093
to: 94.8159999847412 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.403571 3.915729 4.264324 1.817516
0.069138 0.076871 0.077810 0.082348 [error]
Peak 0.142233 0.280550 0.413995 0.189063
0.009006 0.011431 0.013359 0.012607 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 96.616 -1.800 94.816
T90 78.868 0.128 78.996
T50 39.260 4.064 43.324
Peak 1.000 0.156 1.156
====== 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 -1.063 -0.045 0.045 - - - 8.63e-03 -2.00e-04 2.00e-04 48.170 57
CPL -1.003 -0.099 -0.008 999.882 -999.882 -999.882 9.14e-03 -6.61e-04 -1.24e-04 51.110 56
=== 1-s peak 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 -0.725 -0.071 0.072 - - - 6.69e-02 -2.70e-03 2.69e-03 50.100 57
CPL -0.703 -0.087 0.304 9936.610 -9936.610 -9936.610 6.73e-02 -2.41e-03 2.75e-03 50.190 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 7.08e-07 1.70e-06 3.26e-06 1.53e-05 8.83e-06 2.09e-05 erg/cm2
90%_error_low -3.71e-08 -5.13e-08 -8.13e-08 -9.34e-07 -2.11e-07 -9.60e-07 erg/cm2
90%_error_hi 3.79e-08 5.11e-08 8.10e-08 9.79e-07 2.12e-07 1.00e-06 erg/cm2
Peak flux PL 1.70e-04 2.62e-03 7.00e-02 8.55e+00 1.84e-01 8.19e+00 ph/cm2/s
90%_error_low N/A N/A N/A -2.74e-01 N/A 1.88e-01 ph/cm2/s
90%_error_hi N/A N/A N/A 9.44e-01 N/A 1.43e+00 ph/cm2/s
Fluence CPL 7.07e-07 1.70e-06 3.21e-06 1.60e-05 8.82e-06 2.10e-05 erg/cm2
90%_error_low -3.71e-08 -5.14e-08 N/A N/A -2.11e-07 -1.76e-06 erg/cm2
90%_error_hi 3.79e-08 5.11e-08 N/A N/A 2.11e-07 2.54e-07 erg/cm2
Peak flux CPL 1.10e-02 2.02e-03 1.27e-03 2.41e-05 4.39e-02 4.62e-02 ph/cm2/s
90%_error_low -1.10e-02 -2.02e-03 -1.27e-03 -2.41e-05 -4.39e-02 -4.62e-02 ph/cm2/s
90%_error_hi 1.03e-01 8.74e-02 1.55e-02 1.34e-02 5.11e-02 1.70e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 136.4723 21.4826 0.0032 32.2633 179.5052 12.7593574 60.496 TRIG_00420247 Foreground time interval of the image: -1.800 94.816 (delta_t = 96.616 [sec]) Background time interval of the image: -179.896 -1.800 (delta_t = 178.096 [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 -1.800 sec. to 94.816 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06259 ( -0.0449007 0.0451534 ) Norm@50keV : 8.63100E-03 ( -0.000200423 0.000199663 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.17 using 59 PHA bins. # Reduced chi-squared = 0.8450 for 57 degrees of freedom # Null hypothesis probability = 7.913286e-01 Photon flux (15-150 keV) in 96.62 sec: 0.997824 ( -0.024289 0.024396 ) ph/cm2/s Energy fluence (15-150 keV) : 8.82687e-06 ( -2.11443e-07 2.11639e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.800 sec. to 94.816 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.05563 ( -0.046655 0.0443844 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 8.66137E-03 ( -0.000196631 0.000340097 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.44 using 59 PHA bins. # Reduced chi-squared = 0.8649 for 56 degrees of freedom # Null hypothesis probability = 7.536104e-01 Photon flux (15-150 keV) in 96.62 sec: 0.997438 ( -0.024312 0.024372 ) ph/cm2/s Energy fluence (15-150 keV) : 8.82363e-06 ( -2.1137e-07 2.11349e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.156 sec. to 1.156 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.725094 ( -0.0707733 0.0716729 ) Norm@50keV : 6.69428E-02 ( -0.00269793 0.00268656 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.10 using 59 PHA bins. # Reduced chi-squared = 0.8790 for 57 degrees of freedom # Null hypothesis probability = 7.294144e-01 Photon flux (15-150 keV) in 1 sec: 0.184189 ( ) ph/cm2/s Energy fluence (15-150 keV) : 8.0809e-07 ( -3.43055e-08 3.43908e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.156 sec. to 1.156 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.71714 ( -0.0869115 0.304371 ) Epeak [keV] : 9999.99 ( -9999.99 -9999.99 ) Norm@50keV : 6.74527E-02 ( -0.00257787 0.0025754 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.08 using 59 PHA bins. # Reduced chi-squared = 0.8943 for 56 degrees of freedom # Null hypothesis probability = 6.973737e-01 Photon flux (15-150 keV) in 1 sec: 4.38706E-02 ( -0.0438706 0.0511393 ) ph/cm2/s Energy fluence (15-150 keV) : 8.07365e-07 ( -2.95613e-08 3.38364e-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 = -6.312546461430615E-01, IMY = -5.451091616165411E-03
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: -179.896000 -1.800000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 144.4444 12.0801 2.3 39.0 162.2 1.7342 5.0 ------ UNKNOWN 129.7968 0.6346 4.6 54.1 177.2 2.2006 2.5 ------ UNKNOWN 271.4235 62.2951 2.9 56.8 -5.2 3.7787 4.0 ------ UNKNOWN 101.8831 16.8880 3.8 54.1 -143.0 3.7528 3.1 ------ UNKNOWN 93.3142 41.1347 2.5 43.1 -112.2 4.1873 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.800000 94.816000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.3003 -2.7463 1.8 55.6 169.6 6.5945 6.3 ------ UNKNOWN 185.3510 51.9254 2.3 18.7 37.5 0.8663 5.0 ------ UNKNOWN 136.4724 21.4826 0.2 32.3 179.5 12.7599 60.5 ------ UNKNOWN 262.4146 76.1546 2.0 45.6 -16.5 1.7878 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 247.404580 962.199000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9781 -15.6416 0.4 29.3 60.5 27.0111 32.8 0.1 Sco X-1 254.2454 35.3921 4.6 24.0 -146.6 1.4165 2.5 10.8 Her X-1 256.4835 -36.5135 3.1 47.9 37.5 -9.1992 -3.7 5.9 GX 349+2 263.1202 -24.6950 29.0 36.7 27.3 0.3326 0.4 6.8 GX 1+4 268.3567 -1.3336 7.8 17.5 -6.2 0.8713 1.5 7.2 SW J1753.5-0127 270.3468 -25.0247 3.7 38.9 17.2 2.4072 3.1 4.7 GX 5-1 270.4002 -25.7011 5.8 39.6 17.6 1.5866 2.0 5.9 GRS 1758-258 273.9063 -13.9922 3.1 30.8 2.8 2.3009 3.8 6.4 GX 17+2 276.0203 -30.3036 72.1 45.8 13.7 0.1835 0.2 6.2 H1820-303 284.8408 -24.8773 878.0 45.7 0.4 0.0131 0.0 10.9 HT1900.1-2455 288.7843 10.9294 1.2 31.8 -54.7 8.5203 9.8 1.3 GRS 1915+105 262.8758 -33.9086 10.3 45.8 30.1 1.8023 1.1 7.2 GX 354-0 273.8078 -7.0146 2.8 25.3 -6.5 2.3979 4.2 ------ UNKNOWN 294.0051 -29.4614 2.4 54.7 -3.1 8.9023 4.9 ------ UNKNOWN 269.6943 57.3559 4.2 47.1 -132.6 5.7675 2.8 ------ UNKNOWN 286.0595 46.4473 3.6 43.1 -112.4 8.7316 3.2 ------ UNKNOWN