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 Jun 10 14:37:59 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger572742
======================================================================
Trigger: 00572742 Segment: 000
BAT Trigger Time: 402404079.616 [s; MET]
Trigger Stop: 402404080.64 [s; MET]
UTC: 2013-10-02T10:54:28.514160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 75.0612139371135 Dec: -75.7266590313801 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.78
Image Trigger?: NO
Rate S/N Ratio: 12.6095202129185 [ if not an image trigger ]
Image S/N Ratio: 6.78
Analysis Position: [ source = BAT ]
RA: 75.0612139371135 Dec: -75.7266590313801 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 75.1323840259489 Dec: -75.7001501206117 [deg; J2000]
{ 05h 00m 31.8s , -75d 42' 00.5" }
+/- 1.17930828111662 [arcmin] (estimated 90% radius based on SNR)
+/- 0.460652229334899 [arcmin] (formal 1-sigma fit error)
SNR: 24.0322037226857
Angular difference between the analysis and refined position is 1.907938 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 52 +/- 11.1803398874989
Measured from: -4.61599999666214
to: 47.3840000033379 [s; relative to TRIGTIME]
T50: 17 +/- 5.3851648071345
Measured from: 1.38400000333786
to: 18.3840000033379 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.38400000333786
to: 6.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.61599999666214
to: 57.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.699240 0.692114 0.220605 0.030138
0.042147 0.042990 0.036458 0.033270 [error]
Peak 0.035090 0.026621 0.009293 0.008119
0.005418 0.005624 0.004667 0.004180 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 63.000 -5.616 57.384
T90 52.000 -4.616 47.384
T50 17.000 1.384 18.384
Peak 1.000 5.384 6.384
====== 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 -2.225 -0.156 0.149 - - - 1.32e-03 -1.43e-04 1.42e-04 58.680 57
CPL -0.894 -0.769 0.913 30.969 -10.227 5.488 8.68e-03 -8.68e-03 2.34e-02 48.940 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 -2.232 -0.439 0.379 - - - 3.54e-03 -1.13e-03 1.11e-03 47.820 57
CPL -2.205 -0.165 8.973 9999.360 N/A N/A 3.63e-03 N/A N/A 47.840 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 2.11e-07 2.50e-07 2.14e-07 3.12e-07 7.87e-07 9.88e-07 erg/cm2
90%_error_low -2.14e-08 -1.98e-08 -3.12e-08 -7.98e-08 -7.21e-08 -1.21e-07 erg/cm2
90%_error_hi 2.18e-08 1.98e-08 3.23e-08 9.71e-08 7.36e-08 1.34e-07 erg/cm2
Peak flux PL 2.96e-01 1.94e-01 8.25e-02 4.81e-02 5.96e-01 6.20e-01 ph/cm2/s
90%_error_low -7.31e-02 -4.35e-02 -3.23e-02 -2.76e-02 -1.22e-01 -1.31e-01 ph/cm2/s
90%_error_hi 7.43e-02 4.24e-02 3.56e-02 4.49e-02 1.23e-01 1.32e-01 ph/cm2/s
Fluence CPL 1.95e-07 2.86e-07 1.77e-07 3.81e-08 6.89e-07 6.96e-07 erg/cm2
90%_error_low -2.43e-08 -2.77e-08 -4.32e-08 -2.63e-08 -7.33e-08 -7.84e-08 erg/cm2
90%_error_hi 2.42e-08 2.82e-08 4.26e-08 7.45e-08 8.23e-08 1.08e-07 erg/cm2
Peak flux CPL 2.91e-01 2.40e-01 3.27e-02 3.25e-04 5.64e-01 5.64e-01 ph/cm2/s
90%_error_low -8.16e-02 N/A -3.27e-02 -3.25e-04 -1.18e-01 N/A ph/cm2/s
90%_error_hi 8.11e-02 N/A 7.02e-02 6.33e-02 1.22e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 75.1324 -75.7002 0.0080 7.3201 -24.8807 1.0601535 24.032 TRIG_00572742 Foreground time interval of the image: -5.616 12.685 (delta_t = 18.301 [sec]) Background time interval of the image: -739.115 -720.993 (delta_t = 18.123 [sec]) -239.616 -5.616 (delta_t = 234.000 [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 -5.616 sec. to 57.384 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.22542 ( -0.155868 0.148616 ) Norm@50keV : 1.32282E-03 ( -0.000143124 0.000141529 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.68 using 59 PHA bins. # Reduced chi-squared = 1.029 for 57 degrees of freedom # Null hypothesis probability = 4.136654e-01 Photon flux (15-150 keV) in 63 sec: 0.221990 ( -0.01688 0.016883 ) ph/cm2/s Energy fluence (15-150 keV) : 7.86631e-07 ( -7.20676e-08 7.36312e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.616 sec. to 57.384 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.894257 ( -0.769336 0.912878 ) Epeak [keV] : 30.9686 ( -10.2273 5.488 ) Norm@50keV : 8.67915E-03 ( -0.00867915 0.0234209 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.94 using 59 PHA bins. # Reduced chi-squared = 0.8739 for 56 degrees of freedom # Null hypothesis probability = 7.368643e-01 Photon flux (15-150 keV) in 63 sec: 0.211520 ( -0.017482 0.017592 ) ph/cm2/s Energy fluence (15-150 keV) : 6.88937e-07 ( -7.33477e-08 8.23051e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.384 sec. to 6.384 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.23165 ( -0.438876 0.379119 ) Norm@50keV : 3.53985E-03 ( -0.00112742 0.00111068 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.82 using 59 PHA bins. # Reduced chi-squared = 0.8390 for 57 degrees of freedom # Null hypothesis probability = 8.015271e-01 Photon flux (15-150 keV) in 1 sec: 0.596021 ( -0.122416 0.122573 ) ph/cm2/s Energy fluence (15-150 keV) : 3.34449e-08 ( -8.79359e-09 9.41193e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.384 sec. to 6.384 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0181487 ( -2.38575 6.75214 ) Epeak [keV] : 27.8115 ( ) Norm@50keV : 0.117101 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.93 using 59 PHA bins. # Reduced chi-squared = 0.8202 for 56 degrees of freedom # Null hypothesis probability = 8.292859e-01 Photon flux (15-150 keV) in 1 sec: 0.563805 ( -0.117885 0.122307 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 52.0 sec. Hardness ratio (energy fluence ratio) = 0.855401207456
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.61764e-07 S(50-150 keV) = 3.248748e-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 = 1.165369622330883E-01, IMY = 5.404684515048148E-02
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: -739.115400 -720.992500 -239.616000 -5.616000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5329 -40.6743 4.7 41.3 -129.5 1.0005 2.4 7.2 Vela X-1 170.6144 -60.5382 12.3 37.1 -82.9 0.4750 1.0 10.2 Cen X-3 186.9012 -62.8323 5.8 39.7 -70.6 -1.2084 -2.0 7.7 GX 301-2 354.6172 -48.8126 2.8 42.9 44.9 2.4852 4.2 ------ UNKNOWN 7.5188 -52.6826 2.1 35.1 52.1 1.9122 5.4 ------ UNKNOWN 144.3656 -64.2278 1.9 26.0 -94.7 1.5101 6.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.616000 12.684590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5532 -40.6028 5.0 41.4 -129.6 0.2200 2.3 3.1 Vela X-1 170.4622 -60.7423 6.2 36.9 -82.8 0.2034 1.8 8.4 Cen X-3 186.8909 -62.8646 13.7 39.6 -70.6 -0.1124 -0.8 8.6 GX 301-2 319.7993 -49.0019 2.1 53.7 18.0 1.2726 5.4 ------ UNKNOWN 75.1324 -75.7002 0.5 7.3 -24.9 1.0603 24.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 41.484590 422.694000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4787 -40.5290 13.0 43.8 -130.7 0.3260 0.9 2.7 Vela X-1 170.6351 -60.5639 6.0 33.7 -85.5 -0.5398 -1.9 10.1 Cen X-3 186.6359 -62.8065 3.8 34.9 -71.6 0.9328 3.0 2.2 GX 301-2 69.7907 -24.3410 2.3 51.5 150.3 4.2230 5.0 ------ UNKNOWN 351.3993 -58.0669 2.0 33.2 50.2 1.4882 5.7 ------ UNKNOWN 95.4046 -19.6282 2.6 57.1 179.4 4.3567 4.4 ------ UNKNOWN 75.2974 -75.6897 2.3 0.1 -150.5 0.7141 5.0 ------ UNKNOWN 180.8817 -54.7571 2.4 41.2 -81.1 2.7606 4.7 ------ UNKNOWN