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 17:48:25 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger202505
======================================================================
Trigger: 00202505 Segment: 000
BAT Trigger Time: 164817157.12 [s; MET]
Trigger Stop: 164817161.216 [s; MET]
UTC: 2006-03-23T14:32:36.031580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 174.408567159494 Dec: 49.9749559287599 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.72
Image Trigger?: NO
Rate S/N Ratio: 12.0415945787923 [ if not an image trigger ]
Image S/N Ratio: 9.72
Analysis Position: [ source = BAT ]
RA: 174.408567159494 Dec: 49.9749559287599 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 174.423183158918 Dec: 49.9927446855327 [deg; J2000]
{ 11h 37m 41.6s , +49d 59' 33.9" }
+/- 1.51831685528247 [arcmin] (estimated 90% radius based on SNR)
+/- 0.620481290476377 [arcmin] (formal 1-sigma fit error)
SNR: 16.7505556540974
Angular difference between the analysis and refined position is 1.207126 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 23.8719999492168 +/- 5.60339326124083
Measured from: -2.6879999935627
to: 21.1839999556541 [s; relative to TRIGTIME]
T50: 11.7759999930859 +/- 2.20892736378892
Measured from: 0.815999984741211
to: 12.5919999778271 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.5959999859333
to: 3.5959999859333 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.12000000476837
to: 24.4799999892712 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.319907 0.365044 0.300480 0.030001
0.030309 0.031902 0.028556 0.026610 [error]
Peak 0.040100 0.032101 0.015489 0.010026
0.005852 0.006001 0.005619 0.004883 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 29.600 -5.120 24.480
T90 23.872 -2.688 21.184
T50 11.776 0.816 12.592
Peak 1.000 2.596 3.596
====== 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 -1.535 -0.170 0.167 - - - 2.27e-03 -2.17e-04 2.15e-04 50.400 57
CPL -1.429 -0.837 0.569 265.767 -265.767 -265.767 2.57e-03 -8.98e-04 2.31e-03 50.440 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 -1.921 -0.428 0.393 - - - 5.27e-03 -1.42e-03 1.33e-03 51.790 57
CPL -1.936 -1.019 0.122 9999.360 N/A N/A 5.23e-03 N/A N/A 51.800 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 8.87e-08 1.59e-07 2.20e-07 6.31e-07 6.34e-07 1.10e-06 erg/cm2
90%_error_low -1.33e-08 -1.46e-08 -2.86e-08 -1.60e-07 -6.69e-08 -1.86e-07 erg/cm2
90%_error_hi 1.38e-08 1.46e-08 2.86e-08 1.95e-07 6.80e-08 2.15e-07 erg/cm2
Peak flux PL 3.25e-01 2.56e-01 1.35e-01 1.03e-01 7.63e-01 8.20e-01 ph/cm2/s
90%_error_low -8.83e-02 -4.80e-02 -4.70e-02 -5.63e-02 -1.41e-01 -1.58e-01 ph/cm2/s
90%_error_hi 9.02e-02 4.76e-02 4.95e-02 9.12e-02 1.41e-01 1.62e-01 ph/cm2/s
Fluence CPL 8.83e-08 1.60e-07 2.20e-07 6.01e-07 6.32e-07 1.00e-06 erg/cm2
90%_error_low -1.57e-08 -1.50e-08 -2.47e-08 -3.68e-07 -7.50e-08 -3.09e-07 erg/cm2
90%_error_hi 1.12e-08 1.77e-08 2.98e-08 1.43e-07 6.89e-08 1.49e-07 erg/cm2
Peak flux CPL 2.94e-01 1.83e-01 9.60e-02 9.78e-02 6.65e-01 8.30e-01 ph/cm2/s
90%_error_low -1.00e-01 -1.05e-01 -9.60e-02 -3.39e-02 -2.15e-01 N/A ph/cm2/s
90%_error_hi 9.97e-02 8.97e-02 4.00e-02 2.26e-02 2.11e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 174.4232 49.9927 0.0114 18.4115 118.9959 1.0445924 16.751 TRIG_00202505 Foreground time interval of the image: -5.120 24.480 (delta_t = 29.600 [sec]) Background time interval of the image: -239.120 -5.120 (delta_t = 234.000 [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 -5.120 sec. to 24.480 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53516 ( -0.17012 0.167276 ) Norm@50keV : 2.26995E-03 ( -0.000217189 0.000214728 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.40 using 59 PHA bins. # Reduced chi-squared = 0.8843 for 57 degrees of freedom # Null hypothesis probability = 7.191615e-01 Photon flux (15-150 keV) in 29.6 sec: 0.286151 ( -0.025761 0.02579 ) ph/cm2/s Energy fluence (15-150 keV) : 6.33988e-07 ( -6.6885e-08 6.79714e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.120 sec. to 24.480 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53282 ( -0.829946 0.575962 ) Epeak [keV] : 9829.92 ( -9517.87 -9517.87 ) Norm@50keV : 2.27630E-03 ( -0.000602365 0.00260206 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.40 using 59 PHA bins. # Reduced chi-squared = 0.9000 for 56 degrees of freedom # Null hypothesis probability = 6.858528e-01 Photon flux (15-150 keV) in 29.6 sec: 0.285711 ( -0.027266 0.026023 ) ph/cm2/s Energy fluence (15-150 keV) : 6.32312e-07 ( -7.49703e-08 6.89035e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.596 sec. to 3.596 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.92108 ( -0.428463 0.393406 ) Norm@50keV : 5.26989E-03 ( -0.00142221 0.00133456 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.79 using 59 PHA bins. # Reduced chi-squared = 0.9087 for 57 degrees of freedom # Null hypothesis probability = 6.701560e-01 Photon flux (15-150 keV) in 1 sec: 0.763189 ( -0.14085 0.140877 ) ph/cm2/s Energy fluence (15-150 keV) : 4.84697e-08 ( -1.19834e-08 1.28034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.596 sec. to 3.596 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.69549 ( -0.258513 0.882697 ) Epeak [keV] : 225.343 ( ) Norm@50keV : 2.09788E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.29 using 59 PHA bins. # Reduced chi-squared = 0.8802 for 56 degrees of freedom # Null hypothesis probability = 7.248097e-01 Photon flux (15-150 keV) in 1 sec: 0.665123 ( -0.214997 0.210949 ) ph/cm2/s Energy fluence (15-150 keV) : 4.36445e-08 ( -1.4613e-08 1.23132e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 23.872 sec. Hardness ratio (energy fluence ratio) = 1.38019404521
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.4815138e-07 S(50-150 keV) = 3.85845e-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 = -1.613621644231447E-01, IMY = -2.911546454777059E-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: -239.120000 -5.120000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4308 35.3972 6.1 43.9 -14.1 0.5042 1.9 3.5 Her X-1 179.0869 26.2689 2.6 39.1 91.7 2.9736 4.4 ------ UNKNOWN 198.0252 39.6928 2.3 23.6 64.2 0.9630 5.1 ------ UNKNOWN 252.9836 47.5556 2.7 33.5 -24.5 0.8553 4.3 ------ UNKNOWN 87.7913 47.8509 2.6 56.2 -165.3 2.8769 4.5 ------ UNKNOWN 282.5243 66.2105 2.8 33.4 -69.2 1.2558 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.120000 24.480000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4140 35.2209 4.3 44.0 -14.0 0.2530 2.7 7.6 Her X-1 174.4232 49.9927 0.7 18.4 119.0 1.0445 16.8 ------ UNKNOWN 263.1864 53.1491 2.3 34.0 -39.9 0.3967 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 152.380620 164.780590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0228 -15.6342 0.8 23.8 60.9 0.6905 14.6 2.5 Sco X-1 254.5893 35.2884 7.7 43.7 159.5 0.1275 1.5 7.2 Her X-1 255.9924 -37.6929 9.6 32.7 11.9 -0.0594 -1.2 9.1 4U 1700-377 256.4516 -36.3138 7.2 31.3 12.2 0.0778 1.6 6.6 GX 349+2 263.0164 -24.8973 5.2 18.7 7.8 -0.0851 -2.2 9.1 GX 1+4 264.8014 -44.5025 180.3 37.9 -2.0 0.0033 0.1 4.0 4U 1735-44 268.2125 -1.5137 6.8 5.2 -178.0 0.0645 1.7 10.0 SW J1753.5-0127 270.1202 -25.1385 5.1 18.6 -12.5 0.0816 2.3 9.6 GX 5-1 270.2032 -25.8871 5.4 19.3 -12.4 0.0782 2.1 10.2 GRS 1758-258 274.0134 -13.8877 12.7 9.6 -46.2 0.0333 0.9 8.9 GX 17+2 275.7509 -30.5135 0.0 25.0 -22.0 0.0242 0.6 12.6 H1820-303 284.9100 -25.0686 7.1 24.7 -45.4 -0.0744 -1.6 11.2 HT1900.1-2455 288.8903 10.8273 2.7 27.5 -134.6 0.1807 4.3 8.9 GRS 1915+105 299.6103 35.1419 3.7 51.6 -151.6 0.3762 3.1 3.7 Cyg X-1 263.1436 -33.8121 182.4 27.4 2.8 -0.0027 -0.1 7.8 GX 354-0 267.1577 -24.1420 2.7 17.4 -3.9 0.1509 4.2 ------ UNKNOWN 276.6400 -62.1814 2.5 55.9 -10.3 0.5822 4.6 ------ UNKNOWN 297.5352 46.7325 2.8 59.7 -161.8 0.9987 4.2 ------ UNKNOWN 299.3908 7.4071 2.2 34.7 -118.6 0.3331 5.2 ------ UNKNOWN 305.2425 -45.3925 2.2 50.6 -38.9 0.7560 5.2 ------ UNKNOWN