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 19:45:43 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger162580
======================================================================
Trigger: 00162580 Segment: 000
BAT Trigger Time: 152864801.36 [s; MET]
Trigger Stop: 152864801.392 [s; MET]
UTC: 2005-11-05T06:26:41.537840 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 265.289452879954 Dec: 34.9208520942204 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.09
Image Trigger?: NO
Rate S/N Ratio: 17.832554500127 [ if not an image trigger ]
Image S/N Ratio: 7.09
Analysis Position: [ source = BAT ]
RA: 265.289452879954 Dec: 34.9208520942204 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 265.300908276729 Dec: 34.9445907247918 [deg; J2000]
{ 17h 41m 12.2s , +34d 56' 40.5" }
+/- 2.34132672054067 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02539227449372 [arcmin] (formal 1-sigma fit error)
SNR: 9.02226319428429
Angular difference between the analysis and refined position is 1.531730 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 0.0559999942779541 +/- 0.0144222095322683
Measured from: 0
to: 0.0559999942779541 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/- 0.0178885400881622
Measured from: 0.00799998641014099
to: 0.0399999916553497 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.468000024557114
to: 0.531999975442886 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.0639999806880951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006474 0.010877 0.011043 0.002012
0.001771 0.001913 0.001878 0.001150 [error]
Peak 0.007470 0.012755 0.014146 0.007427
0.005060 0.005168 0.004598 0.003901 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.068 -0.004 0.064
T90 0.056 0.000 0.056
T50 0.032 0.008 0.040
Peak 1.000 -0.468 0.532
====== 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 -1.210 -0.342 0.355 - - - 2.43e-02 -5.02e-03 5.02e-03 65.190 57
CPL -0.925 N/A N/A 196.187 N/A N/A 3.37e-02 N/A N/A 65.060 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 -0.928 -0.660 0.780 - - - 2.70e-03 -1.06e-03 1.00e-03 50.020 57
CPL -0.734 N/A N/A 381.751 N/A N/A 3.28e-03 N/A N/A 50.050 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 1.61e-09 3.53e-09 6.11e-09 2.45e-08 1.67e-08 3.57e-08 erg/cm2
90%_error_low -5.77e-10 -8.36e-10 -1.50e-09 -1.08e-08 -3.78e-09 -1.22e-08 erg/cm2
90%_error_hi 6.32e-10 8.13e-10 1.48e-09 1.56e-08 3.82e-09 1.61e-08 erg/cm2
Peak flux PL 6.44e-02 9.13e-02 9.60e-02 1.86e-01 3.10e-01 4.38e-01 ph/cm2/s
90%_error_low -4.40e-02 -9.13e-02 -3.67e-02 -1.18e-01 -1.17e-01 -1.64e-01 ph/cm2/s
90%_error_hi 6.04e-02 4.41e-02 3.57e-02 2.24e-01 1.18e-01 1.93e-01 ph/cm2/s
Fluence CPL 1.54e-09 3.66e-09 6.28e-09 1.60e-08 1.64e-08 2.74e-08 erg/cm2
90%_error_low -6.69e-10 -9.33e-10 -1.62e-09 -1.34e-08 -4.16e-09 -1.41e-08 erg/cm2
90%_error_hi 6.87e-10 1.07e-09 1.75e-09 1.18e-08 3.98e-09 1.28e-08 erg/cm2
Peak flux CPL 6.45e-02 9.13e-02 9.59e-02 1.87e-01 3.10e-01 4.39e-01 ph/cm2/s
90%_error_low -6.45e-02 -9.13e-02 -3.67e-02 -1.87e-01 -1.20e-01 -2.30e-01 ph/cm2/s
90%_error_hi 6.03e-02 4.72e-02 4.57e-02 2.20e-01 1.18e-01 1.06e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 265.3009 34.9446 0.0213 20.8696 142.0257 0.0301620 9.022 TRIG_00162580 Foreground time interval of the image: -0.004 0.064 (delta_t = 0.068 [sec]) Background time interval of the image: -299.360 -0.004 (delta_t = 299.356 [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 -0.004 sec. to 0.064 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20996 ( -0.341635 0.354765 ) Norm@50keV : 2.43073E-02 ( -0.00502439 0.00502436 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.19 using 59 PHA bins. # Reduced chi-squared = 1.144 for 57 degrees of freedom # Null hypothesis probability = 2.132764e-01 Photon flux (15-150 keV) in 0.068 sec: 2.85726 ( -0.6059 0.60728 ) ph/cm2/s Energy fluence (15-150 keV) : 1.67243e-08 ( -3.7833e-09 3.8208e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.064 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.925099 ( ) Epeak [keV] : 196.187 ( ) Norm@50keV : 3.37255E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.06 using 59 PHA bins. # Reduced chi-squared = 1.162 for 56 degrees of freedom # Null hypothesis probability = 1.905073e-01 Photon flux (15-150 keV) in 0.068 sec: 2.83812 ( -0.61398 0.61361 ) ph/cm2/s Energy fluence (15-150 keV) : 1.6444e-08 ( -4.15638e-09 3.98411e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.468 sec. to 0.532 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.928029 ( -0.659869 0.780344 ) Norm@50keV : 2.70021E-03 ( -0.00106364 0.00100107 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.02 using 59 PHA bins. # Reduced chi-squared = 0.8776 for 57 degrees of freedom # Null hypothesis probability = 7.320126e-01 Photon flux (15-150 keV) in 1 sec: 0.310049 ( -0.116531 0.118396 ) ph/cm2/s Energy fluence (15-150 keV) : 2.99826e-08 ( -1.13265e-08 1.14985e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.468 sec. to 0.532 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.35261 ( ) Epeak [keV] : 111.454 ( ) Norm@50keV : 2.10354E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.61 using 59 PHA bins. # Reduced chi-squared = 0.8859 for 56 degrees of freedom # Null hypothesis probability = 7.139123e-01 Photon flux (15-150 keV) in 1 sec: 0.310120 ( -0.120041 0.11788 ) ph/cm2/s Energy fluence (15-150 keV) : 2.99889e-08 ( -1.18838e-08 1.07051e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.05599999 sec. Hardness ratio (energy fluence ratio) = 1.72913898607
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.143031e-09 S(50-150 keV) = 1.1581387e-08
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 = -3.005377951979895E-01, IMY = -2.345888052357080E-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: -299.360000 -0.004000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3828 35.3252 3.5 11.9 143.6 0.5479 3.2 3.8 Her X-1 268.3661 -1.4529 65.7 45.3 -163.2 0.0589 0.2 0.1 SW J1753.5-0127 273.8279 -14.0504 8.1 58.8 -160.3 -2.2660 -1.5 10.4 GX 17+2 288.7060 10.9026 6.7 50.5 165.4 1.0353 1.7 6.0 GRS 1915+105 291.4924 48.4926 2.3 40.0 113.2 2.9833 5.0 ------ UNKNOWN 275.4886 7.1684 3.3 43.0 -179.0 0.9642 3.5 ------ UNKNOWN 170.0080 41.1489 2.3 53.8 -2.0 2.8132 4.9 ------ UNKNOWN 169.6743 30.8525 2.8 57.7 -13.5 3.9534 4.2 ------ UNKNOWN 278.3402 -11.2219 2.9 58.9 -166.4 4.9512 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.004000 0.064000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2270 35.3190 220.0 11.8 143.7 -0.0002 -0.1 11.4 Her X-1 268.2954 -1.4989 80.1 45.3 -163.1 -0.0008 -0.1 5.2 SW J1753.5-0127 274.0869 -13.9735 3.9 58.8 -160.6 -0.0472 -2.9 6.0 GX 17+2 288.8114 11.0283 6.8 50.5 165.2 0.0163 1.7 5.0 GRS 1915+105 294.7839 35.9737 2.6 44.2 131.2 0.0633 4.5 ------ UNKNOWN 265.3008 34.9446 1.3 20.9 142.0 0.0302 9.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 51.340600 302.670500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5274 35.3195 4.7 8.8 -42.1 0.4473 2.5 3.7 Her X-1 268.2828 -1.4155 3.4 36.4 -142.9 0.8368 3.3 5.6 SW J1753.5-0127 274.2169 -14.0513 3.7 49.7 -149.3 1.4434 3.1 12.3 GX 17+2 288.8293 11.0624 4.2 32.1 174.5 0.6698 2.8 7.2 GRS 1915+105 299.6019 35.2112 0.3 28.0 121.5 10.6112 38.8 0.8 Cyg X-1 308.1328 40.9915 4.0 34.0 108.9 1.1806 2.9 2.5 Cyg X-3 283.6475 2.8256 2.1 36.4 -169.9 1.2408 5.6 ------ UNKNOWN 272.3040 14.5154 2.6 21.4 -156.8 0.8507 4.4 ------ UNKNOWN 290.7837 -18.8494 3.1 59.0 -166.2 4.2859 3.7 ------ UNKNOWN 238.2056 21.7420 3.3 27.1 -69.7 0.7372 3.5 ------ UNKNOWN 271.7598 -19.9469 4.8 55.2 -145.3 3.4386 2.5 ------ UNKNOWN 257.2296 -11.6180 2.8 47.2 -127.1 3.1377 4.1 ------ UNKNOWN 232.7469 6.7798 3.0 41.0 -83.5 3.2356 3.9 ------ UNKNOWN