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 Nov 16 01:24:01 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger661036
======================================================================
Trigger: 00661036 Segment: 000
BAT Trigger Time: 467215607.424 [s; MET]
Trigger Stop: 467215615.616 [s; MET]
UTC: 2015-10-22T14:06:32.116140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 349.212869430113 Dec: 55.813346849863 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.24
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 7.24
Analysis Position: [ source = BAT ]
RA: 349.212869430113 Dec: 55.813346849863 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 349.232463026896 Dec: 55.8126592306048 [deg; J2000]
{ 23h 16m 55.8s , +55d 48' 45.6" }
+/- 2.26827853983666 [arcmin] (estimated 90% radius based on SNR)
+/- 0.966884123925847 [arcmin] (formal 1-sigma fit error)
SNR: 9.44018898554026
Angular difference between the analysis and refined position is 0.661861 arcmin
Partial Coding Fraction: 0.3515625 [ including projection effects ]
Duration
T90: 117.680000007153 +/- 18.7778933407152
Measured from: 2.60799998044968
to: 120.287999987602 [s; relative to TRIGTIME]
T50: 67.0720000267029 +/- 23.3560215804344
Measured from: 10.8159999847412
to: 77.8880000114441 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.3719999790192
to: 11.3719999790192 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.04000002145767
to: 132.847999989986 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.674476 0.887534 0.369326 0.170550
0.104838 0.106113 0.091351 0.081571 [error]
Peak 0.024354 0.031148 0.027473 0.017126
0.009438 0.009523 0.008000 0.007405 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 133.888 -1.040 132.848
T90 117.680 2.608 120.288
T50 67.072 10.816 77.888
Peak 1.000 10.372 11.372
====== 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 -1.892 -0.281 0.264 - - - 9.64e-04 -1.74e-04 1.68e-04 51.890 57
CPL -1.655 -0.764 1.641 60.194 N/A N/A 1.33e-03 N/A N/A 51.780 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 -1.399 -0.536 0.555 - - - 5.80e-03 -1.81e-03 1.81e-03 62.630 57
CPL -0.746 -1.598 4.001 98.205 -98.205 -98.205 1.23e-02 -1.23e-02 1.19e+00 62.390 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 2.38e-07 3.45e-07 3.72e-07 7.48e-07 1.19e-06 1.70e-06 erg/cm2
90%_error_low -4.96e-08 -5.03e-08 -8.94e-08 -3.06e-07 -2.06e-07 -4.13e-07 erg/cm2
90%_error_hi 5.12e-08 5.03e-08 9.12e-08 4.24e-07 2.12e-07 5.06e-07 erg/cm2
Peak flux PL 2.17e-01 2.31e-01 1.76e-01 2.17e-01 7.06e-01 8.40e-01 ph/cm2/s
90%_error_low -1.12e-01 -8.37e-02 -6.51e-02 -1.28e-01 -2.29e-01 -2.63e-01 ph/cm2/s
90%_error_hi 1.31e-01 8.05e-02 6.34e-02 2.07e-01 2.30e-01 2.66e-01 ph/cm2/s
Fluence CPL 2.34e-07 3.56e-07 3.68e-07 4.67e-07 1.15e-06 1.43e-06 erg/cm2
90%_error_low -5.48e-08 -6.02e-08 -1.17e-07 -4.24e-07 -2.67e-07 -5.31e-07 erg/cm2
90%_error_hi 5.35e-08 7.94e-08 9.52e-08 3.55e-07 2.29e-07 4.27e-07 erg/cm2
Peak flux CPL 1.92e-01 2.46e-01 1.86e-01 1.11e-01 6.90e-01 7.36e-01 ph/cm2/s
90%_error_low N/A -9.40e-02 -7.31e-02 -1.11e-01 -2.39e-01 -2.79e-01 ph/cm2/s
90%_error_hi N/A 1.08e-01 7.89e-02 1.50e-01 2.37e-01 3.47e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 349.2325 55.8127 0.0204 31.8397 57.1278 2.2593152 9.440 TRIG_00661036 Foreground time interval of the image: -1.040 132.848 (delta_t = 133.888 [sec]) Background time interval of the image: -501.323 -484.563 (delta_t = 16.761 [sec]) -239.424 -1.040 (delta_t = 238.384 [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 -1.040 sec. to 132.848 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89181 ( -0.280793 0.264442 ) Norm@50keV : 9.64012E-04 ( -0.000173639 0.000168312 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.89 using 59 PHA bins. # Reduced chi-squared = 0.9103 for 57 degrees of freedom # Null hypothesis probability = 6.667102e-01 Photon flux (15-150 keV) in 133.9 sec: 0.137876 ( -0.020123 0.020129 ) ph/cm2/s Energy fluence (15-150 keV) : 1.18686e-06 ( -2.06198e-07 2.11664e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.040 sec. to 132.848 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65504 ( -0.763499 1.64142 ) Epeak [keV] : 60.1939 ( ) Norm@50keV : 1.32720E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.78 using 59 PHA bins. # Reduced chi-squared = 0.9247 for 56 degrees of freedom # Null hypothesis probability = 6.352207e-01 Photon flux (15-150 keV) in 133.9 sec: 0.136672 ( -0.021239 0.020733 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15266e-06 ( -2.67235e-07 2.28618e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 10.372 sec. to 11.372 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39905 ( -0.535599 0.555454 ) Norm@50keV : 5.79697E-03 ( -0.00180806 0.00180682 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.63 using 59 PHA bins. # Reduced chi-squared = 1.099 for 57 degrees of freedom # Null hypothesis probability = 2.834475e-01 Photon flux (15-150 keV) in 1 sec: 0.705823 ( -0.22869 0.230484 ) ph/cm2/s Energy fluence (15-150 keV) : 5.60325e-08 ( -1.86516e-08 1.89483e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.372 sec. to 11.372 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.74583 ( -1.59801 4.00089 ) Epeak [keV] : 98.2053 ( -98.1843 -98.1843 ) Norm@50keV : 1.22710E-02 ( -0.012275 1.18585 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.39 using 59 PHA bins. # Reduced chi-squared = 1.114 for 56 degrees of freedom # Null hypothesis probability = 2.594450e-01 Photon flux (15-150 keV) in 1 sec: 0.689573 ( -0.238752 0.237424 ) ph/cm2/s Energy fluence (15-150 keV) : 5.37997e-08 ( -2.03008e-08 2.02597e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 117.68 sec. Hardness ratio (energy fluence ratio) = 1.07790357606
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.836873e-07 S(50-150 keV) = 6.031771e-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 = 3.370504102847328E-01, IMY = -5.215546828021406E-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: -501.323400 -484.562600 -239.424000 -1.040000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3987 35.1506 0.0 36.9 -82.8 -0.7345 -1.3 11.9 Her X-1 288.8733 10.9802 5.1 35.2 -152.8 0.5992 2.2 4.9 GRS 1915+105 299.5960 35.2141 0.6 9.4 -164.9 4.0395 18.6 0.8 Cyg X-1 308.1293 40.9624 1.1 6.0 128.9 2.3136 10.9 1.0 Cyg X-3 326.1451 38.3392 15.6 19.3 105.1 0.1798 0.7 1.6 Cyg X-2 0.6585 65.8287 1.9 37.9 40.1 2.5882 6.1 ------ UNKNOWN 342.1291 63.0899 2.3 29.5 41.8 1.4065 5.0 ------ UNKNOWN 278.4687 29.8740 2.1 23.3 -115.7 1.3599 5.4 ------ UNKNOWN 225.8886 64.5838 3.2 44.9 -30.9 1.5125 3.6 ------ UNKNOWN 266.4793 12.6423 3.0 43.7 -120.5 3.4121 3.9 ------ UNKNOWN 221.1093 53.1930 2.9 50.8 -44.5 4.6755 4.0 ------ UNKNOWN 269.1993 5.6699 2.8 48.0 -129.0 4.0969 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.040000 132.848000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6764 35.3484 13.7 36.6 -82.6 -0.2838 -0.8 10.7 Her X-1 288.6962 10.9138 3.9 35.3 -152.6 0.5334 3.0 6.3 GRS 1915+105 299.6686 35.3063 4.0 9.3 -165.1 -0.4007 -2.9 7.4 Cyg X-1 308.0591 41.1015 6.7 5.8 128.2 -0.2422 -1.7 9.2 Cyg X-3 325.9965 38.3941 14.6 19.2 105.1 -0.1360 -0.8 9.3 Cyg X-2 349.2306 55.8138 1.2 31.8 57.1 2.2540 9.4 ------ UNKNOWN 319.7270 15.2546 2.6 33.0 151.7 0.8418 4.4 ------ UNKNOWN 296.8492 57.0517 2.3 12.9 -6.4 0.6882 5.0 ------ UNKNOWN 285.2039 -2.1567 2.9 48.9 -152.9 1.2449 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 284.276600 962.627900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6003 35.1896 0.8 39.3 -142.0 9.5773 13.8 0.9 Cyg X-1 308.1180 40.9514 0.9 30.5 -143.3 6.3749 12.6 0.4 Cyg X-3 326.1701 38.3156 3.5 23.3 -170.7 1.3185 3.2 0.4 Cyg X-2 60.6619 40.5666 3.7 47.6 35.5 6.1074 3.1 ------ UNKNOWN 19.6384 63.7513 0.6 17.0 8.3 8.8624 20.5 ------ UNKNOWN 273.4283 62.1386 3.3 37.3 -90.1 4.8526 3.5 ------ UNKNOWN 284.3712 34.9256 3.0 48.0 -129.1 7.6671 3.8 ------ UNKNOWN