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: Mon Jan 13 21:01:46 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger501520
======================================================================
Trigger: 00501520 Segment: 000
BAT Trigger Time: 336096119.808 [s; MET]
Trigger Stop: 336096123.904 [s; MET]
UTC: 2011-08-27T00:01:52.506420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.094969657904 Dec: 53.7870142613548 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 7.19
Analysis Position: [ source = BAT ]
RA: 164.094969657904 Dec: 53.7870142613548 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 164.056330257319 Dec: 53.8124732529263 [deg; J2000]
{ 10h 56m 13.5s , +53d 48' 44.9" }
+/- 2.1400955143657 [arcmin] (estimated 90% radius based on SNR)
+/- 1.3603282935017 [arcmin] (formal 1-sigma fit error)
SNR: 10.2581964841422
Angular difference between the analysis and refined position is 2.051393 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8.51599997282028 +/- 1.10060529766742
Measured from: -2.52400004863739
to: 5.99199992418289 [s; relative to TRIGTIME]
T50: 4.01599991321564 +/- 2.08068067292671
Measured from: -0.680000007152557
to: 3.33599990606308 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.11599999666214
to: 3.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.88400000333786
to: 6.28799998760223 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.065654 0.109603 0.081855 0.017776
0.013830 0.014425 0.012855 0.011005 [error]
Peak 0.010292 0.021782 0.012773 0.006678
0.004632 0.004746 0.004325 0.003671 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 9.172 -2.884 6.288
T90 8.516 -2.524 5.992
T50 4.016 -0.680 3.336
Peak 1.000 2.116 3.116
====== 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: 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 -1.247 -0.265 0.266 - - - 1.96e-03 -2.91e-04 2.90e-04 81.970 57
CPL -0.880 -0.609 1.202 165.986 -165.986 -165.986 2.91e-03 -1.21e-03 7.09e-03 81.570 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 -1.258 -0.536 0.547 - - - 3.11e-03 -8.85e-04 8.77e-04 71.910 57
CPL -1.251 -0.542 0.547 9999.360 -9999.360 -9999.360 3.12e-03 -8.89e-04 1.84e-02 71.920 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 1.81e-08 3.88e-08 6.54e-08 2.52e-07 1.80e-07 3.75e-07 erg/cm2
90%_error_low -4.75e-09 -6.41e-09 -1.22e-08 -9.05e-08 -3.03e-08 -1.01e-07 erg/cm2
90%_error_hi 5.14e-09 6.29e-09 1.21e-08 1.21e-07 3.07e-08 1.27e-07 erg/cm2
Peak flux PL 1.02e-01 1.18e-01 9.87e-02 1.39e-01 3.68e-01 4.57e-01 ph/cm2/s
90%_error_low -4.98e-02 -3.87e-02 -3.53e-02 -8.19e-02 -1.05e-01 -1.35e-01 ph/cm2/s
90%_error_hi 5.77e-02 3.68e-02 3.39e-02 1.37e-01 1.05e-01 1.45e-01 ph/cm2/s
Fluence CPL 1.67e-08 4.00e-08 6.76e-08 1.53e-07 1.76e-07 2.78e-07 erg/cm2
90%_error_low -6.02e-09 -7.09e-09 -1.35e-08 -1.07e-07 -3.23e-08 -1.12e-07 erg/cm2
90%_error_hi 6.09e-09 7.41e-09 1.41e-08 1.27e-07 3.22e-08 1.32e-07 erg/cm2
Peak flux CPL 1.05e-01 1.18e-01 9.76e-02 1.53e-01 3.71e-01 4.59e-01 ph/cm2/s
90%_error_low -5.83e-02 -3.88e-02 -3.44e-02 N/A N/A -1.71e-01 ph/cm2/s
90%_error_hi 5.34e-02 2.10e-02 3.74e-02 N/A N/A 1.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 164.0563 53.8125 0.0187 10.7234 -140.1872 0.2719673 10.258 TRIG_00501520 Foreground time interval of the image: -2.884 6.288 (delta_t = 9.172 [sec]) Background time interval of the image: -271.907 -258.331 (delta_t = 13.576 [sec]) -239.808 -2.884 (delta_t = 236.924 [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 -2.884 sec. to 6.288 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2471 ( -0.265096 0.266254 ) Norm@50keV : 1.95596E-03 ( -0.000290832 0.000290403 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.97 using 59 PHA bins. # Reduced chi-squared = 1.438 for 57 degrees of freedom # Null hypothesis probability = 1.681179e-02 Photon flux (15-150 keV) in 9.172 sec: 0.231230 ( -0.034797 0.034881 ) ph/cm2/s Energy fluence (15-150 keV) : 1.79702e-07 ( -3.02599e-08 3.06871e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.884 sec. to 6.288 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.880419 ( -0.608933 1.20234 ) Epeak [keV] : 165.986 ( -165.984 -165.984 ) Norm@50keV : 2.90727E-03 ( -0.00120949 0.00708646 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.57 using 59 PHA bins. # Reduced chi-squared = 1.457 for 56 degrees of freedom # Null hypothesis probability = 1.449021e-02 Photon flux (15-150 keV) in 9.172 sec: 0.227287 ( -0.03659 0.036359 ) ph/cm2/s Energy fluence (15-150 keV) : 1.75741e-07 ( -3.23163e-08 3.22498e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.116 sec. to 3.116 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25837 ( -0.535943 0.547065 ) Norm@50keV : 3.10903E-03 ( -0.000885301 0.000877436 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.91 using 59 PHA bins. # Reduced chi-squared = 1.262 for 57 degrees of freedom # Null hypothesis probability = 8.817602e-02 Photon flux (15-150 keV) in 1 sec: 0.368223 ( -0.104723 0.104957 ) ph/cm2/s Energy fluence (15-150 keV) : 3.10506e-08 ( -1.0021e-08 1.03122e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.116 sec. to 3.116 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25124 ( -0.542096 0.547822 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 3.12343E-03 ( -0.000888708 0.0184122 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.92 using 59 PHA bins. # Reduced chi-squared = 1.284 for 56 degrees of freedom # Null hypothesis probability = 7.450222e-02 Photon flux (15-150 keV) in 1 sec: 0.370772 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.1245e-08 ( -1.14899e-08 5.88372e-09 ) 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 = -1.454662102788873E-01, IMY = 1.212528985929966E-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: -271.907400 -258.330900 -239.808000 -2.884000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 64.5273 64.5635 2.6 37.0 69.5 1.8963 4.4 ------ UNKNOWN 192.6302 23.0294 3.1 48.0 -129.0 2.9032 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.884000 6.288000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 77.5843 39.4877 2.6 46.6 32.3 0.3931 4.5 ------ UNKNOWN 178.4376 63.0915 2.1 16.4 172.9 0.1403 5.4 ------ UNKNOWN 164.0575 53.8124 1.1 10.7 -140.2 0.2718 10.2 ------ UNKNOWN 208.6742 33.8851 2.1 47.4 -153.1 0.3351 5.5 ------ UNKNOWN 188.5960 22.8092 2.2 46.3 -124.5 0.6591 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 205.692600 721.792600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6116 35.2776 16.9 22.4 155.6 0.1964 0.7 8.5 Her X-1 299.6518 35.2068 1.6 39.0 86.6 8.5468 7.4 3.0 Cyg X-1 308.1682 40.8991 4.2 39.3 72.6 3.0044 2.7 4.1 Cyg X-3 236.8658 4.7634 3.2 54.0 -179.3 3.7297 3.6 ------ UNKNOWN 75.7889 63.9418 4.2 58.4 -19.4 4.5764 2.8 ------ UNKNOWN 213.9598 20.3160 3.2 46.1 -145.1 2.4374 3.7 ------ UNKNOWN 201.9611 24.6349 2.1 47.9 -129.0 6.4333 5.5 ------ UNKNOWN