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: Tue Jun 9 12:28:51 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger582374
======================================================================
Trigger: 00582374 Segment: 000
BAT Trigger Time: 409991975.616 [s; MET]
Trigger Stop: 409991976.064 [s; MET]
UTC: 2013-12-29T06:39:24.163760 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 85.2356212466857 Dec: -4.43148525974796 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.86
Image Trigger?: NO
Rate S/N Ratio: 20.174241001832 [ if not an image trigger ]
Image S/N Ratio: 7.86
Analysis Position: [ source = BAT ]
RA: 85.2356212466857 Dec: -4.43148525974796 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 85.2363671642732 Dec: -4.40212651138017 [deg; J2000]
{ 05h 40m 56.7s , -04d 24' 07.7" }
+/- 0.574528098862354 [arcmin] (estimated 90% radius based on SNR)
+/- 0.146624207548326 [arcmin] (formal 1-sigma fit error)
SNR: 67.1366114067294
Angular difference between the analysis and refined position is 1.762090 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: 0.38400000333786
to: 48.3840000033379 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.38400000333786
to: 16.3840000033379 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.88400000333786
to: 8.88400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.38400000333786
to: 96.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.898441 3.285647 3.330946 1.120465
0.058869 0.062483 0.056425 0.045733 [error]
Peak 0.014585 0.032644 0.014037 0.004237
0.006153 0.006339 0.005373 0.004189 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 96.000 0.384 96.384
T90 48.000 0.384 48.384
T50 16.000 0.384 16.384
Peak 1.000 7.884 8.884
====== 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 -1.073 -0.041 0.042 - - - 6.80e-03 -1.54e-04 1.53e-04 49.510 57
CPL -1.011 -0.076 0.117 983.465 -983.465 -983.465 7.21e-03 -5.20e-04 7.27e-04 49.850 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 -1.475 -0.477 0.484 - - - 4.28e-03 -1.20e-03 1.18e-03 67.670 57
CPL -1.476 -1.786 0.559 9999.240 -9999.240 -9999.240 4.29e-03 -1.21e-03 -4.29e-03 67.670 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 5.60e-07 1.34e-06 2.54e-06 1.18e-05 6.89e-06 1.62e-05 erg/cm2
90%_error_low -2.80e-08 -3.93e-08 -5.88e-08 -6.53e-07 -1.54e-07 -6.70e-07 erg/cm2
90%_error_hi 2.86e-08 3.92e-08 5.86e-08 6.82e-07 1.54e-07 6.95e-07 erg/cm2
Peak flux PL 1.72e-01 1.76e-01 1.26e-01 1.45e-01 5.31e-01 6.19e-01 ph/cm2/s
90%_error_low -7.45e-02 -5.11e-02 -4.42e-02 -8.11e-02 -1.44e-01 -1.70e-01 ph/cm2/s
90%_error_hi 8.16e-02 4.97e-02 4.36e-02 1.31e-01 1.45e-01 1.73e-01 ph/cm2/s
Fluence CPL 5.59e-07 1.34e-06 2.54e-06 1.17e-05 6.89e-06 1.54e-05 erg/cm2
90%_error_low -3.11e-08 -3.28e-08 -5.89e-08 -2.09e-06 -1.47e-07 -1.55e-06 erg/cm2
90%_error_hi 2.06e-08 3.34e-08 5.86e-08 4.02e-07 1.53e-07 1.38e-06 erg/cm2
Peak flux CPL 1.76e-01 1.74e-01 1.25e-01 1.47e-01 5.30e-01 6.21e-01 ph/cm2/s
90%_error_low -7.83e-02 -4.91e-02 -4.32e-02 -1.47e-01 -1.44e-01 -2.71e-01 ph/cm2/s
90%_error_hi 7.79e-02 1.37e-01 4.50e-02 1.27e-01 1.45e-01 1.68e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 85.2364 -4.4021 0.0029 18.1276 178.4870 3.2945669 67.137 TRIG_00582374 Foreground time interval of the image: 0.384 9.485 (delta_t = 9.101 [sec]) Background time interval of the image: -103.315 0.384 (delta_t = 103.699 [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 0.384 sec. to 96.384 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07302 ( -0.0413998 0.0416669 ) Norm@50keV : 6.80265E-03 ( -0.000153809 0.000153249 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.51 using 59 PHA bins. # Reduced chi-squared = 0.8685 for 57 degrees of freedom # Null hypothesis probability = 7.492452e-01 Photon flux (15-150 keV) in 96 sec: 0.787129 ( -0.018802 0.018868 ) ph/cm2/s Energy fluence (15-150 keV) : 6.88844e-06 ( -1.53695e-07 1.53968e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.384 sec. to 96.384 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.01149 ( -0.019874 0.172448 ) Epeak [keV] : 983.465 ( -9988.75 -9988.75 ) Norm@50keV : 7.21314E-03 ( -0.000146562 0.00109989 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.85 using 59 PHA bins. # Reduced chi-squared = 0.8903 for 56 degrees of freedom # Null hypothesis probability = 7.053304e-01 Photon flux (15-150 keV) in 96 sec: 0.786820 ( -0.020405 0.018741 ) ph/cm2/s Energy fluence (15-150 keV) : 6.8867e-06 ( -1.46683e-07 1.5311e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 7.884 sec. to 8.884 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47519 ( -0.477425 0.484478 ) Norm@50keV : 4.27814E-03 ( -0.00120308 0.0011806 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.67 using 59 PHA bins. # Reduced chi-squared = 1.187 for 57 degrees of freedom # Null hypothesis probability = 1.576194e-01 Photon flux (15-150 keV) in 1 sec: 0.530609 ( -0.144377 0.144691 ) ph/cm2/s Energy fluence (15-150 keV) : 4.07596e-08 ( -1.23405e-08 1.27116e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.884 sec. to 8.884 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47595 ( -1.78602 0.559127 ) Epeak [keV] : 9999.24 ( -9999.36 -9999.36 ) Norm@50keV : 4.28887E-03 ( -0.00121007 -0.00428933 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.67 using 59 PHA bins. # Reduced chi-squared = 1.208 for 56 degrees of freedom # Null hypothesis probability = 1.365059e-01 Photon flux (15-150 keV) in 1 sec: 0.529924 ( -0.143766 0.145289 ) ph/cm2/s Energy fluence (15-150 keV) : 2.52674e-08 ( -6.54765e-09 2.80207e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 48.0 sec. Hardness ratio (energy fluence ratio) = 1.90134086298
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8974954e-06 S(50-150 keV) = 4.991038e-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 = -3.272700866210436E-01, IMY = -8.643914241720100E-03
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: -103.315400 0.384000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6304 22.0158 0.3 8.5 12.6 4.3327 38.0 0.2 Crab 68.6547 -44.6062 3.3 59.5 -161.8 3.2238 3.5 ------ UNKNOWN 51.3359 -21.9913 3.3 47.0 -132.0 1.5475 3.5 ------ UNKNOWN 45.1920 -7.1970 2.8 42.6 -110.2 2.3842 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.384000 9.484590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7768 22.1579 10.9 8.7 13.4 0.0526 1.1 11.7 Crab 122.9643 49.2071 2.3 48.6 41.0 1.2334 5.0 ------ UNKNOWN 85.2364 -4.4021 0.2 18.1 178.5 3.2946 67.2 ------ UNKNOWN 44.7185 -4.6296 3.9 41.8 -106.5 0.6448 3.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 80.084610 482.514000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6331 22.0206 0.4 26.5 62.6 4.9960 26.4 0.4 Crab 135.5324 -40.4585 14.8 57.7 -158.0 0.6627 0.8 5.8 Vela X-1 59.0670 26.1047 2.6 39.7 27.5 1.0956 4.5 ------ UNKNOWN 85.2232 -4.4356 2.2 0.0 152.3 0.7006 5.2 ------ UNKNOWN 86.1908 -33.9631 2.7 29.5 -115.8 0.7861 4.3 ------ UNKNOWN 136.5798 -42.4884 3.3 59.3 -156.3 3.6787 3.5 ------ UNKNOWN 47.5324 -30.0658 3.3 43.8 -64.3 2.5834 3.5 ------ UNKNOWN