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: Sat Jan 11 21:56:18 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger580267
======================================================================
Trigger: 00580267 Segment: 000
BAT Trigger Time: 407927930.304 [s; MET]
Trigger Stop: 407927932.352 [s; MET]
UTC: 2013-12-05T09:18:38.948060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 131.608992800002 Dec: -60.1740032566644 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.19
Image Trigger?: NO
Rate S/N Ratio: 11.13552872566 [ if not an image trigger ]
Image S/N Ratio: 8.19
Analysis Position: [ source = BAT ]
RA: 131.608992800002 Dec: -60.1740032566644 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 131.609 Dec: -60.174 [deg; J2000]
{ 08h 46m 26.2s , -60d -10' -26.4" }
+/- 2.60581169346 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.74409854948
Angular difference between the analysis and refined position is 0.000290 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 20.3439999222755 +/- 0.938594662245004
Measured from: -0.0600000023841858
to: 20.2839999198914 [s; relative to TRIGTIME]
T50: 18.9079999923706 +/- 18.8542069704413
Measured from: 0.771999955177307
to: 19.6799999475479 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 19.311999976635
to: 20.311999976635 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.252000033855438
to: 20.5079999566078 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.102738 0.084767 0.109376 0.006290
0.024833 0.025562 0.022415 0.019275 [error]
Peak 0.016671 0.030718 0.027631 0.015961
0.005784 0.006100 0.005571 0.004508 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 20.760 -0.252 20.508
T90 20.344 -0.060 20.284
T50 18.908 0.772 19.680
Peak 1.000 19.312 20.312
====== 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 -1.522 -0.458 0.435 - - - 9.63e-04 -2.48e-04 2.39e-04 53.090 57
CPL -1.506 N/A N/A 9974.720 N/A N/A 9.80e-04 N/A N/A 53.100 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 -1.202 -0.388 0.399 - - - 5.68e-03 -1.16e-03 1.16e-03 35.680 57
CPL -1.209 -2.797 0.869 9999.350 N/A N/A 5.70e-03 N/A N/A 35.690 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 2.60e-08 4.72e-08 6.58e-08 1.91e-07 1.89e-07 3.30e-07 erg/cm2
90%_error_low -9.69e-09 -1.14e-08 -2.26e-08 -1.09e-07 -5.24e-08 -1.33e-07 erg/cm2
90%_error_hi 1.05e-08 1.12e-08 2.23e-08 1.78e-07 5.39e-08 1.91e-07 erg/cm2
Peak flux PL 1.76e-01 2.11e-01 1.84e-01 2.73e-01 6.67e-01 8.44e-01 ph/cm2/s
90%_error_low -6.76e-02 -5.23e-02 -4.63e-02 -1.24e-01 -1.39e-01 -1.84e-01 ph/cm2/s
90%_error_hi 7.62e-02 5.01e-02 4.47e-02 1.80e-01 1.40e-01 1.93e-01 ph/cm2/s
Fluence CPL 2.63e-08 4.67e-08 6.55e-08 2.01e-07 1.90e-07 3.17e-07 erg/cm2
90%_error_low -1.15e-08 -1.08e-08 -2.28e-08 -1.49e-07 -5.61e-08 -1.66e-07 erg/cm2
90%_error_hi 1.04e-08 1.39e-08 2.42e-08 1.94e-07 3.84e-08 1.38e-07 erg/cm2
Peak flux CPL 1.76e-01 2.08e-01 1.80e-01 3.05e-01 6.67e-01 8.82e-01 ph/cm2/s
90%_error_low N/A -6.35e-02 N/A N/A -1.40e-01 -2.89e-01 ph/cm2/s
90%_error_hi N/A 6.69e-02 N/A N/A 1.40e-01 1.96e-01 ph/cm2/s
======================================================================
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 131.609 -60.174 0.000 19.729 -33.287 0.090 7.744 TRIG_00580267 Image time interval: 0.000 to 2.048 [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 -0.252 sec. to 20.508 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52162 ( -0.457954 0.434804 ) Norm@50keV : 9.62577E-04 ( -0.000248419 0.000238747 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.09 using 59 PHA bins. # Reduced chi-squared = 0.9314 for 57 degrees of freedom # Null hypothesis probability = 6.225723e-01 Photon flux (15-150 keV) in 20.76 sec: 0.120883 ( -0.0284276 0.028472 ) ph/cm2/s Energy fluence (15-150 keV) : 1.88942e-07 ( -5.24244e-08 5.39415e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 20.508 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5056 ( ) Epeak [keV] : 9974.72 ( ) Norm@50keV : 9.79766E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.10 using 59 PHA bins. # Reduced chi-squared = 0.9482 for 56 degrees of freedom # Null hypothesis probability = 5.853748e-01 Photon flux (15-150 keV) in 20.76 sec: 0.121363 ( -0.0439322 0.028776 ) ph/cm2/s Energy fluence (15-150 keV) : 1.89752e-07 ( -5.60505e-08 3.83697e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 19.312 sec. to 20.312 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20217 ( -0.388453 0.399472 ) Norm@50keV : 5.67929E-03 ( -0.00116424 0.0011638 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.68 using 59 PHA bins. # Reduced chi-squared = 0.6259 for 57 degrees of freedom # Null hypothesis probability = 9.879541e-01 Photon flux (15-150 keV) in 1 sec: 0.666839 ( -0.139498 0.140121 ) ph/cm2/s Energy fluence (15-150 keV) : 5.75904e-08 ( -1.34425e-08 1.36539e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.312 sec. to 20.312 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.52951 ( -1.47655 2.18967 ) Epeak [keV] : 169.086 ( ) Norm@50keV : 1.06151E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.17 using 59 PHA bins. # Reduced chi-squared = 0.6281 for 56 degrees of freedom # Null hypothesis probability = 9.867525e-01 Photon flux (15-150 keV) in 1 sec: 0.666724 ( -0.139752 0.140013 ) ph/cm2/s Energy fluence (15-150 keV) : 5.79215e-08 ( -1.68368e-08 7.63262e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 20.344 sec. Hardness ratio (energy fluence ratio) = 1.3931886296
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.325934e-08 S(50-150 keV) = 1.1568277e-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 = 0.29977964718, IMY = 0.196822643445
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: -50.803400 -0.252000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.8060 -40.5317 0.0 0.3 -140.3 0.0404 0.5 12.7 Vela X-1 170.6514 -60.5704 5.9 29.4 -74.2 0.1949 1.9 10.4 Cen X-3 186.5431 -62.7842 90.1 37.2 -75.0 0.0245 0.1 3.2 GX 301-2 34.8572 -69.7261 2.6 55.8 -14.6 1.2206 4.5 ------ UNKNOWN 195.4022 -59.3864 2.3 41.1 -81.0 1.5789 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.252000 20.508000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.8060 -40.5317 0.0 0.3 -140.1 -0.0436 -0.8 12.7 Vela X-1 170.3339 -60.7537 99.3 29.3 -73.7 0.0090 0.1 7.9 Cen X-3 186.3323 -62.8355 5.7 37.1 -74.9 -0.2586 -2.0 9.7 GX 301-2 134.7376 -65.4172 2.2 24.8 -38.2 0.3055 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 72.796610 962.766000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.3735 -40.6557 8.9 19.7 152.0 -0.6336 -1.3 9.3 Vela X-1 170.3037 -60.6188 1.5 18.8 -108.3 3.7531 7.5 0.4 Cen X-3 186.5582 -62.7654 2.0 25.6 -96.8 3.4142 5.8 2.7 GX 301-2 65.4237 -57.3683 2.4 33.0 28.5 3.1446 4.8 ------ UNKNOWN 18.4995 -53.7396 2.9 54.3 5.5 7.1692 3.9 ------ UNKNOWN 13.1610 -52.9065 3.1 56.7 2.8 10.2066 3.7 ------ UNKNOWN 39.0202 -72.4252 4.9 34.9 -4.7 1.4545 2.4 ------ UNKNOWN 125.0178 -69.2295 2.8 9.5 -22.2 1.9739 4.2 ------ UNKNOWN 154.0099 -70.8020 3.4 14.0 -67.9 1.6558 3.4 ------ UNKNOWN 173.7894 -10.0407 2.6 59.1 -166.1 15.4386 4.4 ------ UNKNOWN 196.3998 -73.6931 4.4 26.9 -70.8 1.6199 2.7 ------ UNKNOWN 340.6599 -65.3166 3.0 52.6 -21.8 4.8825 3.8 ------ UNKNOWN