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 Sep 11 20:58:37 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger708598
======================================================================
Trigger: 00708598 Segment: 000
BAT Trigger Time: 492954328.448 [s; MET]
Trigger Stop: 492954329.472 [s; MET]
UTC: 2016-08-15T11:45:11.734540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.686231783051 Dec: 84.2999980928292 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.55
Image Trigger?: NO
Rate S/N Ratio: 29.3938769133981 [ if not an image trigger ]
Image S/N Ratio: 12.55
Analysis Position: [ source = BAT ]
RA: 288.686231783051 Dec: 84.2999980928292 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 288.616285136508 Dec: 84.2984506938288 [deg; J2000]
{ 19h 14m 27.9s , +84d 17' 54.4" }
+/- 0.969787085396543 [arcmin] (estimated 90% radius based on SNR)
+/- 0.335371393467033 [arcmin] (formal 1-sigma fit error)
SNR: 31.7798687681838
Angular difference between the analysis and refined position is 0.427095 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 8.56799989938736 +/- 1.8342955655889
Measured from: -4.25999999046326
to: 4.3079999089241 [s; relative to TRIGTIME]
T50: 2.87199997901917 +/- 0.291204389676345
Measured from: -0.156000018119812
to: 2.71599996089935 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.14399999380112
to: 3.14399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.40799999237061
to: 5.19599997997284 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.655528 0.914291 0.630525 0.122144
0.038439 0.041549 0.036145 0.028525 [error]
Peak 0.145093 0.191871 0.159921 0.030142
0.013068 0.014501 0.012825 0.009217 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 11.604 -6.408 5.196
T90 8.568 -4.260 4.308
T50 2.872 -0.156 2.716
Peak 1.000 2.144 3.144
====== 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 -1.725 -0.092 0.091 - - - 1.36e-02 -7.55e-04 7.52e-04 60.000 57
CPL -0.961 -0.395 0.434 67.728 -9.676 21.670 3.31e-02 -1.20e-02 2.11e-02 48.200 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 -1.570 -0.133 0.131 - - - 3.68e-02 -2.90e-03 2.90e-03 33.770 57
CPL -1.134 -0.489 0.587 106.504 -35.149 -106.504 5.96e-02 -2.42e-02 5.23e-02 31.780 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 2.49e-07 4.00e-07 4.83e-07 1.15e-06 1.46e-06 2.28e-06 erg/cm2
90%_error_low -2.15e-08 -2.18e-08 -3.49e-08 -1.64e-07 -8.38e-08 -1.96e-07 erg/cm2
90%_error_hi 2.21e-08 2.18e-08 3.49e-08 1.80e-07 8.41e-08 2.08e-07 erg/cm2
Peak flux PL 1.62e+00 1.56e+00 1.05e+00 1.11e+00 4.69e+00 5.35e+00 ph/cm2/s
90%_error_low -2.14e-01 -1.32e-01 -1.02e-01 -2.04e-01 -3.79e-01 -4.14e-01 ph/cm2/s
90%_error_hi 2.24e-01 1.31e-01 1.01e-01 2.28e-01 3.80e-01 4.14e-01 ph/cm2/s
Fluence CPL 2.19e-07 4.30e-07 5.05e-07 4.42e-07 1.39e-06 1.60e-06 erg/cm2
90%_error_low -2.61e-08 -2.69e-08 -3.93e-08 -1.56e-07 -9.07e-08 -1.80e-07 erg/cm2
90%_error_hi 2.66e-08 2.74e-08 3.97e-08 2.56e-07 9.11e-08 2.64e-07 erg/cm2
Peak flux CPL 1.48e+00 1.62e+00 1.11e+00 7.36e-01 4.60e+00 4.94e+00 ph/cm2/s
90%_error_low -2.70e-01 -1.50e-01 -1.22e-01 -2.82e-01 -3.92e-01 -5.25e-01 ph/cm2/s
90%_error_hi 2.79e-01 1.53e-01 1.25e-01 4.56e-01 3.93e-01 6.19e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 288.6163 84.2985 0.0061 41.9049 13.6167 2.4691020 31.780 TRIG_00708598 Foreground time interval of the image: -6.408 5.196 (delta_t = 11.604 [sec]) Background time interval of the image: -239.448 -6.408 (delta_t = 233.040 [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 -6.408 sec. to 5.196 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72491 ( -0.0922982 0.0910761 ) Norm@50keV : 1.36258E-02 ( -0.000755416 0.000752361 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.00 using 59 PHA bins. # Reduced chi-squared = 1.053 for 57 degrees of freedom # Null hypothesis probability = 3.675722e-01 Photon flux (15-150 keV) in 11.6 sec: 1.82577 ( -0.10073 0.10092 ) ph/cm2/s Energy fluence (15-150 keV) : 1.46103e-06 ( -8.38286e-08 8.40733e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.408 sec. to 5.196 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.961261 ( -0.39484 0.434067 ) Epeak [keV] : 67.7279 ( -9.67607 21.6706 ) Norm@50keV : 3.30991E-02 ( -0.0119584 0.0211368 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.20 using 59 PHA bins. # Reduced chi-squared = 0.8607 for 56 degrees of freedom # Null hypothesis probability = 7.613327e-01 Photon flux (15-150 keV) in 11.6 sec: 1.75870 ( -0.10601 0.1062 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39351e-06 ( -9.07373e-08 9.1087e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.144 sec. to 3.144 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.56993 ( -0.13262 0.130668 ) Norm@50keV : 3.67945E-02 ( -0.00290336 0.00289516 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 33.77 using 59 PHA bins. # Reduced chi-squared = 0.5924 for 57 degrees of freedom # Null hypothesis probability = 9.938919e-01 Photon flux (15-150 keV) in 1 sec: 4.68544 ( -0.37905 0.37982 ) ph/cm2/s Energy fluence (15-150 keV) : 3.45478e-07 ( -2.89078e-08 2.90377e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.144 sec. to 3.144 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.13369 ( -0.489275 0.587438 ) Epeak [keV] : 106.504 ( -35.1493 -106.504 ) Norm@50keV : 5.96298E-02 ( -0.0242499 0.0523076 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 31.78 using 59 PHA bins. # Reduced chi-squared = 0.5676 for 56 degrees of freedom # Null hypothesis probability = 9.962451e-01 Photon flux (15-150 keV) in 1 sec: 4.60101 ( -0.39245 0.39305 ) ph/cm2/s Energy fluence (15-150 keV) : 3.39735e-07 ( -3.00644e-08 3.00251e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.568 sec. Hardness ratio (energy fluence ratio) = 1.1762238169
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.482703e-07 S(50-150 keV) = 7.452459e-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 = 8.721793904678404E-01, IMY = -2.112719245971386E-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: -239.448000 -6.408000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3770 35.5099 53.3 39.2 94.3 0.1875 0.2 10.8 Her X-1 91.6114 61.8182 3.6 57.5 -26.2 3.7401 3.2 ------ UNKNOWN 164.0628 18.8313 2.0 43.1 -113.4 5.0932 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.408000 5.196000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4770 35.4666 4.7 39.3 94.3 -0.4644 -2.4 7.5 Her X-1 333.3416 78.4281 2.1 50.1 16.7 0.7802 5.5 ------ UNKNOWN 288.6164 84.2984 0.4 41.9 13.6 2.4695 31.8 ------ UNKNOWN 271.7616 83.5992 2.1 40.1 14.4 0.3715 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 77.652590 962.624200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3244 35.3577 5.9 50.0 163.1 3.8717 2.0 6.6 Her X-1 325.3160 73.7899 3.6 12.1 73.8 1.6686 3.3 ------ UNKNOWN 52.6793 58.4588 2.3 35.0 -4.6 3.7968 5.0 ------ UNKNOWN 178.0830 72.8937 2.2 19.8 -108.1 3.0390 5.3 ------ UNKNOWN 69.6723 34.8947 3.4 59.6 -17.0 14.0885 3.4 ------ UNKNOWN 78.9753 36.1966 3.6 58.8 -25.9 13.6719 3.2 ------ UNKNOWN 98.5733 44.9639 4.3 50.6 -44.5 9.1761 2.7 ------ UNKNOWN