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 Sep 10 17:19:51 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger559482
======================================================================
Trigger: 00559482 Segment: 000
BAT Trigger Time: 394345074.368 [s; MET]
Trigger Stop: 394345075.392 [s; MET]
UTC: 2013-07-01T04:17:43.630460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 357.215620241738 Dec: 36.099431990312 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.22
Image Trigger?: NO
Rate S/N Ratio: 135.14806694881 [ if not an image trigger ]
Image S/N Ratio: 22.22
Analysis Position: [ source = BAT ]
RA: 357.215620241738 Dec: 36.099431990312 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 357.223735416883 Dec: 36.099591237941 [deg; J2000]
{ 23h 48m 53.7s , +36d 05' 58.5" }
+/- 0.758440690399934 [arcmin] (estimated 90% radius based on SNR)
+/- 0.20031326778811 [arcmin] (formal 1-sigma fit error)
SNR: 45.1501207219042
Angular difference between the analysis and refined position is 0.393537 arcmin
Partial Coding Fraction: 0.28125 [ including projection effects ]
Duration
T90: 4.37999993562698 +/- 0.252634126101044
Measured from: -0.39599996805191
to: 3.98399996757507 [s; relative to TRIGTIME]
T50: 2.32400000095367 +/- 0.130598592485389
Measured from: 0.412000000476837
to: 2.73600000143051 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0600000023841858
to: 1.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.13999998569489
to: 5.3520000576973 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.590754 2.607478 2.030967 0.437232
0.046383 0.055394 0.049608 0.030825 [error]
Peak 0.375108 0.725822 0.700676 0.184274
0.021307 0.027512 0.027125 0.016700 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 6.492 -1.140 5.352
T90 4.380 -0.396 3.984
T50 2.324 0.412 2.736
Peak 1.000 0.060 1.060
====== 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: CPL)
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 -1.579 -0.045 0.045 - - - 7.40e-02 -1.98e-03 1.98e-03 76.370 57
CPL -0.903 -0.201 0.210 89.162 -9.351 15.363 1.52e-01 -2.87e-02 3.72e-02 40.050 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 -1.268 -0.067 0.067 - - - 1.44e-01 -5.98e-03 5.99e-03 72.190 57
CPL -0.656 -0.282 0.301 122.632 -23.318 55.874 2.77e-01 -7.04e-02 1.01e-01 57.450 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 6.60e-07 1.16e-06 1.55e-06 4.25e-06 4.51e-06 7.62e-06 erg/cm2
90%_error_low -3.24e-08 -3.49e-08 -4.95e-08 -2.86e-07 -1.24e-07 -3.20e-07 erg/cm2
90%_error_hi 3.29e-08 3.48e-08 4.94e-08 2.99e-07 1.24e-07 3.29e-07 erg/cm2
Peak flux PL 4.75e+00 5.49e+00 4.56e+00 6.37e+00 1.71e+01 2.12e+01 ph/cm2/s
90%_error_low -3.60e-01 -2.65e-01 -2.15e-01 -5.90e-01 -7.39e-01 -9.01e-01 ph/cm2/s
90%_error_hi 3.69e-01 2.64e-01 2.14e-01 6.23e-01 7.39e-01 9.04e-01 ph/cm2/s
Fluence CPL 5.66e-07 1.21e-06 1.65e-06 2.01e-06 4.38e-06 5.44e-06 erg/cm2
90%_error_low -4.02e-08 -3.98e-08 -5.93e-08 -3.59e-07 -1.32e-07 -3.74e-07 erg/cm2
90%_error_hi 4.11e-08 4.01e-08 5.97e-08 4.53e-07 1.31e-07 4.58e-07 erg/cm2
Peak flux CPL 2.83e+00 1.96e+00 9.36e-01 7.66e-01 6.05e+00 6.47e+00 ph/cm2/s
90%_error_low -5.65e-01 -3.82e-01 -1.74e-01 -8.51e-02 -1.29e+00 -1.41e+00 ph/cm2/s
90%_error_hi 5.79e-01 4.05e-01 2.05e-01 2.09e-01 1.28e+00 1.33e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 357.2237 36.0996 0.0042 41.1652 -130.2012 7.0458895 45.150 TRIG_00559482 Foreground time interval of the image: -1.140 5.352 (delta_t = 6.492 [sec]) Background time interval of the image: -239.368 -1.140 (delta_t = 238.228 [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 -1.140 sec. to 5.352 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5787 ( -0.0454658 0.0453813 ) Norm@50keV : 7.39963E-02 ( -0.00197593 0.00197582 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.37 using 59 PHA bins. # Reduced chi-squared = 1.340 for 57 degrees of freedom # Null hypothesis probability = 4.432090e-02 Photon flux (15-150 keV) in 6.492 sec: 9.44752 ( -0.27869 0.27931 ) ph/cm2/s Energy fluence (15-150 keV) : 4.50535e-06 ( -1.24197e-07 1.24197e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.140 sec. to 5.352 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.902599 ( -0.200912 0.210102 ) Epeak [keV] : 89.1621 ( -9.35093 15.3628 ) Norm@50keV : 0.152299 ( -0.0287345 0.0372382 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.05 using 59 PHA bins. # Reduced chi-squared = 0.7152 for 56 degrees of freedom # Null hypothesis probability = 9.468694e-01 Photon flux (15-150 keV) in 6.492 sec: 9.09207 ( -0.29291 0.29402 ) ph/cm2/s Energy fluence (15-150 keV) : 4.37621e-06 ( -1.31595e-07 1.31213e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.060 sec. to 1.060 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.26808 ( -0.0671409 0.0672229 ) Norm@50keV : 0.144177 ( -0.0059853 0.00598526 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.19 using 59 PHA bins. # Reduced chi-squared = 1.267 for 57 degrees of freedom # Null hypothesis probability = 8.465227e-02 Photon flux (15-150 keV) in 1 sec: 17.1038 ( -0.7386 0.7393 ) ph/cm2/s Energy fluence (15-150 keV) : 1.43632e-06 ( -6.4175e-08 6.42975e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 1.060 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.655967 ( -0.281713 0.300529 ) Epeak [keV] : 122.632 ( -23.3173 55.8743 ) Norm@50keV : 0.277369 ( -0.0704392 0.101206 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.45 using 59 PHA bins. # Reduced chi-squared = 1.026 for 56 degrees of freedom # Null hypothesis probability = 4.213166e-01 Photon flux (15-150 keV) in 1 sec: 6.05113 ( -1.28509 1.28412 ) ph/cm2/s Energy fluence (15-150 keV) : 1.40984e-06 ( -6.68586e-08 6.66823e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.38 sec. Hardness ratio (energy fluence ratio) = 1.3623543616
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7801215e-06 S(50-150 keV) = 2.5960666e-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 = -5.643777236738406E-01, IMY = 6.678219948756898E-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: -239.368000 -1.140000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.7182 35.2290 11.9 48.0 162.7 0.6311 1.0 6.5 Cyg X-1 307.9691 40.9329 5.0 47.4 174.4 1.1179 2.3 6.5 Cyg X-3 326.1664 38.3472 6.9 38.8 -168.9 0.4665 1.7 1.6 Cyg X-2 293.5343 6.7438 2.1 42.0 122.0 4.7854 5.6 ------ UNKNOWN 324.4688 -49.8433 4.3 51.1 31.2 3.0710 2.7 ------ UNKNOWN 339.6856 -21.8095 2.8 22.6 11.3 0.8404 4.1 ------ UNKNOWN 19.3854 -41.2326 3.1 57.7 -16.0 3.7922 3.7 ------ UNKNOWN 9.2759 -15.3222 2.5 37.2 -41.2 1.3562 4.5 ------ UNKNOWN 23.2843 -17.4297 3.8 50.6 -44.5 3.6390 3.0 ------ UNKNOWN 0.2045 46.3895 2.7 51.0 -135.6 4.8233 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.140000 5.352000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6031 35.1971 13.9 48.0 162.6 0.1176 0.8 0.7 Cyg X-1 308.1539 40.7937 5.7 47.2 174.4 0.2269 2.0 9.7 Cyg X-3 326.1232 38.1434 0.0 38.6 -169.1 -0.0132 -0.2 10.9 Cyg X-2 357.2237 36.0996 0.3 41.2 -130.2 7.0462 45.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 74.332600 962.694400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.4395 35.2120 5.2 46.2 133.2 -1.5205 -2.2 7.4 Cyg X-1 308.1175 40.9567 18.5 38.2 139.1 0.2034 0.6 0.4 Cyg X-3 326.1761 38.3155 129.5 24.7 130.9 0.0157 0.1 0.4 Cyg X-2 311.6410 23.9793 2.5 40.9 112.1 2.6542 4.6 ------ UNKNOWN 301.7816 76.1833 2.2 47.0 -169.2 1.3482 5.3 ------ UNKNOWN 200.2582 84.0522 3.3 59.4 -156.3 3.2461 3.5 ------ UNKNOWN 109.6091 85.3252 2.5 55.8 -148.4 4.0181 4.5 ------ UNKNOWN 49.4744 38.7159 3.2 41.0 -83.6 2.3148 3.6 ------ UNKNOWN