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 22:08:14 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger331093
======================================================================
Trigger: 00331093 Segment: 000
BAT Trigger Time: 245188692.544 [s; MET]
Trigger Stop: 245188694.592 [s; MET]
UTC: 2008-10-08T19:58:09.384500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.987257236876 Dec: -57.4643799585525 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10
Image Trigger?: NO
Rate S/N Ratio: 19.7737199332852 [ if not an image trigger ]
Image S/N Ratio: 10
Analysis Position: [ source = BAT ]
RA: 279.987257236876 Dec: -57.4643799585525 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 279.96819305153 Dec: -57.4375697162417 [deg; J2000]
{ 18h 39m 52.4s , -57d 26' 15.3" }
+/- 1.00331538982712 [arcmin] (estimated 90% radius based on SNR)
+/- 0.366707801772723 [arcmin] (formal 1-sigma fit error)
SNR: 30.2736541930644
Angular difference between the analysis and refined position is 1.722317 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 187.824000030756 +/- 38.2284553731243
Measured from: -43.3720000088215
to: 144.452000021935 [s; relative to TRIGTIME]
T50: 111.108000010252 +/- 1.9575658398699
Measured from: 1.50799998641014
to: 112.615999996662 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.52399998903275
to: 8.52399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: -65.8880000114441
to: 195.912000000477 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.109706 2.870847 1.815992 0.425950
0.088334 0.085187 0.072912 0.063513 [error]
Peak 0.039011 0.057280 0.056434 0.007094
0.006321 0.006272 0.005615 0.004457 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 261.800 -65.888 195.912
T90 187.824 -43.372 144.452
T50 111.108 1.508 112.616
Peak 1.000 7.524 8.524
====== 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 -1.623 -0.071 0.071 - - - 1.74e-03 -6.70e-05 6.69e-05 49.250 57
CPL -1.349 -0.274 0.294 118.169 -37.230 1905.991 2.39e-03 -6.24e-04 9.34e-04 46.330 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 -1.343 -0.203 0.203 - - - 1.07e-02 -1.22e-03 1.22e-03 54.410 57
CPL -0.989 -0.458 0.844 152.830 -152.830 -152.830 1.58e-02 N/A N/A 53.730 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 6.54e-07 1.11e-06 1.45e-06 3.80e-06 4.25e-06 7.01e-06 erg/cm2
90%_error_low -4.46e-08 -4.48e-08 -7.37e-08 -4.11e-07 -1.74e-07 -4.64e-07 erg/cm2
90%_error_hi 4.56e-08 4.47e-08 7.36e-08 4.45e-07 1.75e-07 4.91e-07 erg/cm2
Peak flux PL 3.79e-01 4.19e-01 3.30e-01 4.29e-01 1.29e+00 1.56e+00 ph/cm2/s
90%_error_low -7.72e-02 -5.36e-02 -4.64e-02 -1.15e-01 -1.49e-01 -1.82e-01 ph/cm2/s
90%_error_hi 8.24e-02 5.29e-02 4.58e-02 1.39e-01 1.50e-01 1.85e-01 ph/cm2/s
Fluence CPL 6.21e-07 1.14e-06 1.46e-06 2.50e-06 4.15e-06 5.72e-06 erg/cm2
90%_error_low -5.43e-08 -5.17e-08 -7.73e-08 -8.13e-07 -2.04e-07 -8.38e-07 erg/cm2
90%_error_hi 5.53e-08 5.24e-08 7.80e-08 1.29e-06 2.03e-07 1.30e-06 erg/cm2
Peak flux CPL 3.50e-01 4.29e-01 3.42e-01 2.96e-01 1.26e+00 1.42e+00 ph/cm2/s
90%_error_low -9.61e-02 -5.81e-02 -5.20e-02 -1.55e-01 -1.57e-01 -2.35e-01 ph/cm2/s
90%_error_hi 9.96e-02 5.97e-02 5.38e-02 1.76e-01 1.57e-01 1.41e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 279.9682 -57.4376 0.0063 21.4334 143.6024 3.8264819 30.274 TRIG_00331093 Foreground time interval of the image: -65.888 31.157 (delta_t = 97.045 [sec]) Background time interval of the image: -755.343 -657.490 (delta_t = 97.854 [sec]) -239.544 -65.888 (delta_t = 173.656 [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 -65.888 sec. to 195.912 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62337 ( -0.0712831 0.0710292 ) Norm@50keV : 1.74187E-03 ( -6.69985e-05 6.68685e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.25 using 59 PHA bins. # Reduced chi-squared = 0.8640 for 57 degrees of freedom # Null hypothesis probability = 7.575742e-01 Photon flux (15-150 keV) in 261.8 sec: 0.225497 ( -0.008976 0.008998 ) ph/cm2/s Energy fluence (15-150 keV) : 4.25373e-06 ( -1.73919e-07 1.74702e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -65.888 sec. to 195.912 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34871 ( -0.274027 0.293756 ) Epeak [keV] : 118.169 ( -37.2308 1905.99 ) Norm@50keV : 2.38835E-03 ( -0.000623873 0.000934056 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.33 using 59 PHA bins. # Reduced chi-squared = 0.8273 for 56 degrees of freedom # Null hypothesis probability = 8.181732e-01 Photon flux (15-150 keV) in 261.8 sec: 0.221337 ( -0.009836 0.009852 ) ph/cm2/s Energy fluence (15-150 keV) : 4.14733e-06 ( -2.03851e-07 2.03374e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 7.524 sec. to 8.524 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34307 ( -0.203346 0.202893 ) Norm@50keV : 1.06988E-02 ( -0.00122181 0.0012194 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.41 using 59 PHA bins. # Reduced chi-squared = 0.9546 for 57 degrees of freedom # Null hypothesis probability = 5.727679e-01 Photon flux (15-150 keV) in 1 sec: 1.28709 ( -0.1493 0.14962 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04669e-07 ( -1.3346e-08 1.34909e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.524 sec. to 8.524 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.989291 ( -0.458049 0.843846 ) Epeak [keV] : 152.830 ( -152.828 -152.828 ) Norm@50keV : 1.57587E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.73 using 59 PHA bins. # Reduced chi-squared = 0.9595 for 56 degrees of freedom # Null hypothesis probability = 5.612349e-01 Photon flux (15-150 keV) in 1 sec: 1.26415 ( -0.15686 0.15663 ) ph/cm2/s Energy fluence (15-150 keV) : 1.02296e-07 ( -1.43431e-08 1.43393e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 187.824 sec. Hardness ratio (energy fluence ratio) = 1.29834454945
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7681412e-06 S(50-150 keV) = 2.485612e-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 = -3.159848729512354E-01, IMY = -2.329440581907557E-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: -755.343390 -657.489800 -239.544000 -65.888000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3510 -60.6936 8.6 55.2 -148.9 1.7832 1.3 4.4 Cen X-3 186.6547 -62.8185 3.4 47.2 -149.0 1.5613 3.4 2.9 GX 301-2 244.9681 -15.6470 0.3 27.9 -36.8 8.0932 34.3 0.8 Sco X-1 255.7891 -37.8772 15.6 3.9 -55.3 0.1448 0.7 9.6 4U 1700-377 256.3535 -36.4654 3.5 4.7 -38.8 0.6446 3.3 4.7 GX 349+2 263.0046 -24.7157 7.1 16.0 5.8 0.3064 1.6 1.8 GX 1+4 264.8713 -44.4471 15.1 5.6 131.7 0.1402 0.8 5.5 4U 1735-44 268.3888 -1.4294 2.0 39.9 8.3 1.7836 5.9 1.9 SW J1753.5-0127 270.3367 -25.1308 1.9 17.8 28.1 1.1789 6.0 4.2 GX 5-1 270.3492 -25.7614 4.2 17.2 29.1 0.5394 2.8 2.8 GRS 1758-258 274.0554 -14.0934 5.3 29.3 24.2 0.5064 2.2 4.5 GX 17+2 275.8608 -30.3355 2.5 16.7 52.1 0.9488 4.5 3.8 H1820-303 285.1104 -24.7739 9.1 26.5 55.9 -0.3282 -1.3 9.7 HT1900.1-2455 263.0306 -33.8266 1.6 7.2 18.0 1.4528 7.4 2.1 GX 354-0 266.5530 -32.2155 1.2 10.0 30.8 2.0379 9.6 ------ UNKNOWN 255.1979 -41.6370 1.7 3.5 -116.3 1.2260 6.7 ------ UNKNOWN 226.7241 -3.8793 4.4 47.0 -53.2 2.4941 2.6 ------ UNKNOWN 215.4734 -22.6366 2.5 41.1 -83.5 4.3952 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -65.888000 31.156620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2942 -60.7450 5.3 55.2 -149.0 -1.1862 -2.2 7.3 Cen X-3 186.5951 -62.9191 16.6 47.2 -149.1 0.1626 0.7 9.1 GX 301-2 244.8286 -15.6417 24.5 27.9 -37.1 -0.0621 -0.5 8.7 Sco X-1 255.9212 -37.8348 14.2 3.9 -53.8 0.0869 0.8 3.1 4U 1700-377 256.2481 -36.4209 6.3 4.8 -39.3 -0.1911 -1.9 9.0 GX 349+2 262.8980 -24.8881 175.4 15.8 5.6 0.0074 0.1 10.5 GX 1+4 264.5339 -44.4359 31.3 5.4 133.4 0.0385 0.4 9.0 4U 1735-44 268.4840 -1.4506 614.6 39.9 8.4 -0.0033 -0.0 7.0 SW J1753.5-0127 270.4383 -25.1271 6.4 17.8 28.3 -0.2107 -1.8 8.9 GX 5-1 270.3454 -25.8034 7.5 17.2 29.2 -0.1806 -1.5 4.3 GRS 1758-258 273.8608 -13.9534 5.3 29.3 23.7 0.2998 2.2 9.8 GX 17+2 275.7508 -30.3439 7.5 16.6 51.9 -0.1779 -1.5 9.1 H1820-303 285.1815 -24.8402 6.2 26.5 56.1 0.2954 1.9 9.3 HT1900.1-2455 262.9148 -33.9810 7.1 7.0 17.7 0.1688 1.6 9.5 GX 354-0 306.6726 -28.7465 2.5 40.0 82.5 2.1223 4.6 ------ UNKNOWN 15.8339 -79.8626 2.3 54.6 163.3 3.4156 5.1 ------ UNKNOWN 298.7740 -69.2083 3.1 35.3 151.6 0.6374 3.8 ------ UNKNOWN 23.3104 -83.0223 2.0 53.6 167.3 3.0121 5.9 ------ UNKNOWN 279.9682 -57.4376 0.4 21.4 143.6 3.8262 30.3 ------ UNKNOWN 275.0389 -53.7486 1.9 16.9 141.6 0.6823 6.2 ------ UNKNOWN 217.1420 -54.6138 2.1 31.3 -136.8 0.7388 5.4 ------ UNKNOWN UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 75.956590 962.513000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3137 -60.6238 82.0 49.8 -143.1 0.2027 0.1 0.1 Cen X-3 186.6047 -62.7380 1.8 42.7 -138.0 5.9816 6.3 2.4 GX 301-2 244.9676 -15.6290 0.9 49.3 -47.1 26.9011 12.2 1.0 Sco X-1 255.7440 -37.9376 0.0 25.2 -50.0 0.3486 0.7 12.8 4U 1700-377 256.2931 -36.3989 2.9 26.3 -47.3 2.0820 4.0 7.0 GX 349+2 262.9972 -24.8899 9.8 34.8 -28.0 0.6480 1.2 8.7 GX 1+4 264.9549 -44.3296 14.2 16.1 -42.3 -0.3472 -0.8 11.6 4U 1735-44 268.2859 -1.4597 14.1 56.8 -14.4 1.5859 0.8 4.9 SW J1753.5-0127 270.3187 -25.0675 1.4 33.1 -16.5 4.2378 8.1 2.0 GX 5-1 270.3160 -25.7864 3.7 32.4 -16.7 1.5998 3.1 2.7 GRS 1758-258 273.9052 -14.0244 5.7 43.7 -8.9 1.5002 2.0 5.9 GX 17+2 275.9167 -30.3446 2.7 27.3 -8.0 1.9743 4.3 1.4 H1820-303 285.1812 -24.9754 10.2 32.7 8.4 0.6012 1.1 8.6 HT1900.1-2455 262.9727 -33.8359 1.1 26.3 -33.6 4.6075 10.4 0.8 GX 354-0 279.9916 -57.4523 1.4 0.0 106.5 4.2476 8.4 ------ UNKNOWN 278.9050 -5.9766 2.3 51.5 -1.7 5.2591 5.0 ------ UNKNOWN 277.3173 -23.7466 2.2 33.8 -4.7 3.5071 5.3 ------ UNKNOWN 276.4749 -31.5710 2.6 26.0 -7.2 1.9459 4.5 ------ UNKNOWN 266.5416 -32.2277 0.7 26.8 -26.2 7.4664 16.5 ------ UNKNOWN 257.3179 -44.1057 2.3 19.4 -56.7 2.3599 5.1 ------ UNKNOWN 255.1558 -41.6521 1.4 22.3 -56.0 4.3738 8.3 ------ UNKNOWN