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 Jan 20 12:15:18 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger252593
======================================================================
Trigger: 00252593 Segment: 000
BAT Trigger Time: 188453464 [s; MET]
Trigger Stop: 188453528 [s; MET]
UTC: 2006-12-22T04:11:02.350780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 105.357290328966 Dec: -25.8555478617164 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.83
Analysis Position: [ source = BAT ]
RA: 105.357290328966 Dec: -25.8555478617164 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 105.353903329546 Dec: -25.8678309517905 [deg; J2000]
{ 07h 01m 24.9s , -25d 52' 04.2" }
+/- 1.29600812761518 [arcmin] (estimated 90% radius based on SNR)
+/- 0.447740856112547 [arcmin] (formal 1-sigma fit error)
SNR: 21.001494515391
Angular difference between the analysis and refined position is 0.759334 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 37.2479999661446 +/- 6.05790721767193
Measured from: 41.7039999961853
to: 78.9519999623299 [s; relative to TRIGTIME]
T50: 19.311999976635 +/- 2.58750228941296
Measured from: 47.0480000078678
to: 66.3599999845028 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.2759999930859
to: 60.2759999930859 [s; relative to TRIGTIME]
Total Fluence
Measured from: 35.1119999885559
to: 84.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.333452 1.667826 0.892326 0.147357
0.092104 0.096250 0.081763 0.068577 [error]
Peak 0.067076 0.066503 0.034062 0.022550
0.013766 0.014334 0.011911 0.010016 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 49.776 35.112 84.888
T90 37.248 41.704 78.952
T50 19.312 47.048 66.360
Peak 1.000 59.276 60.276
====== 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 -1.956 -0.131 0.127 - - - 4.96e-03 -4.14e-04 4.08e-04 51.930 57
CPL -1.306 -0.503 0.569 47.294 -11.359 20.588 1.14e-02 -5.27e-03 1.19e-02 46.870 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 -2.162 -0.417 0.367 - - - 9.23e-03 -2.81e-03 2.75e-03 63.320 57
CPL 0.064 -1.904 3.127 33.402 -19.429 12.647 2.36e-01 -2.36e-01 3.96e+01 59.200 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 4.85e-07 6.75e-07 6.96e-07 1.31e-06 2.27e-06 3.17e-06 erg/cm2
90%_error_low -5.05e-08 -4.76e-08 -7.83e-08 -2.75e-07 -1.82e-07 -3.62e-07 erg/cm2
90%_error_hi 5.17e-08 4.76e-08 7.89e-08 3.19e-07 1.84e-07 3.94e-07 erg/cm2
Peak flux PL 7.21e-01 4.92e-01 2.20e-01 1.36e-01 1.50e+00 1.57e+00 ph/cm2/s
90%_error_low -2.04e-01 -1.15e-01 -8.15e-02 -7.46e-02 -3.43e-01 -3.62e-01 ph/cm2/s
90%_error_hi 2.11e-01 1.14e-01 8.67e-02 1.14e-01 3.43e-01 3.63e-01 ph/cm2/s
Fluence CPL 4.50e-07 7.27e-07 6.94e-07 4.94e-07 2.15e-06 2.37e-06 erg/cm2
90%_error_low -5.79e-08 -6.16e-08 -8.83e-08 -2.49e-07 -2.00e-07 -3.26e-07 erg/cm2
90%_error_hi 5.83e-08 6.31e-08 8.69e-08 5.33e-07 2.04e-07 5.57e-07 erg/cm2
Peak flux CPL 6.65e-01 6.34e-01 1.69e-01 8.15e-03 1.48e+00 1.48e+00 ph/cm2/s
90%_error_low -2.25e-01 -1.66e-01 -1.69e-01 -8.15e-03 -3.33e-01 -3.32e-01 ph/cm2/s
90%_error_hi 2.29e-01 1.72e-01 1.18e-01 7.97e-02 3.36e-01 3.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 105.3539 -25.8678 0.0092 37.1700 104.0873 3.9702804 21.001 TRIG_00252593 Foreground time interval of the image: 35.112 76.701 (delta_t = 41.589 [sec]) Background time interval of the image: -239.000 35.112 (delta_t = 274.112 [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 35.112 sec. to 84.888 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.95614 ( -0.131039 0.127104 ) Norm@50keV : 4.96139E-03 ( -0.000413831 0.000408409 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.93 using 59 PHA bins. # Reduced chi-squared = 0.9111 for 57 degrees of freedom # Null hypothesis probability = 6.650816e-01 Photon flux (15-150 keV) in 49.78 sec: 0.729643 ( -0.052374 0.052427 ) ph/cm2/s Energy fluence (15-150 keV) : 2.27371e-06 ( -1.82274e-07 1.84192e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.112 sec. to 84.888 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30598 ( -0.503173 0.56903 ) Epeak [keV] : 47.2940 ( -11.3593 20.5878 ) Norm@50keV : 1.13536E-02 ( -0.00527163 0.0119136 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.87 using 59 PHA bins. # Reduced chi-squared = 0.8370 for 56 degrees of freedom # Null hypothesis probability = 8.024168e-01 Photon flux (15-150 keV) in 49.78 sec: 0.710028 ( -0.054387 0.054427 ) ph/cm2/s Energy fluence (15-150 keV) : 2.1536e-06 ( -1.99596e-07 2.03648e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 59.276 sec. to 60.276 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.16155 ( -0.416047 0.367687 ) Norm@50keV : 9.23484E-03 ( -0.00280727 0.00274968 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.32 using 59 PHA bins. # Reduced chi-squared = 1.111 for 57 degrees of freedom # Null hypothesis probability = 2.631481e-01 Photon flux (15-150 keV) in 1 sec: 1.49876 ( -0.34256 0.34256 ) ph/cm2/s Energy fluence (15-150 keV) : 8.63853e-08 ( -2.30115e-08 2.40048e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.276 sec. to 60.276 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0643306 ( -1.91924 3.1118 ) Epeak [keV] : 33.4019 ( -19.3496 12.7265 ) Norm@50keV : 0.235953 ( -0.248137 39.5686 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.20 using 59 PHA bins. # Reduced chi-squared = 1.057 for 56 degrees of freedom # Null hypothesis probability = 3.595655e-01 Photon flux (15-150 keV) in 1 sec: 1.47626 ( -0.33265 0.33575 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 37.248 sec. Hardness ratio (energy fluence ratio) = 1.03090762728
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.1602198e-06 S(50-150 keV) = 1.1134915e-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 = -1.845495917877787E-01, IMY = -7.354137459376950E-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: -239.000000 35.112000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5216 -40.5193 1.7 32.4 155.5 1.8294 6.9 2.1 Vela X-1 170.3025 -60.6752 3.8 33.8 -149.4 0.7206 3.1 3.2 Cen X-3 186.7515 -62.6763 4.7 38.5 -138.4 0.9454 2.4 6.2 GX 301-2 90.9357 -59.5056 2.0 3.6 51.2 1.1220 5.9 ------ UNKNOWN 74.4079 -64.3738 2.8 9.5 -22.0 0.7575 4.1 ------ UNKNOWN 162.2172 -85.8515 3.1 26.2 -99.7 1.0431 3.8 ------ UNKNOWN 205.2858 -54.5121 2.3 51.0 -135.6 5.1594 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 35.112000 76.700600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5125 -40.7092 3.7 32.2 155.7 0.2478 3.1 9.3 Vela X-1 170.3158 -60.6185 27.3 33.8 -149.4 0.0310 0.4 0.3 Cen X-3 186.5464 -62.6817 8.5 38.5 -138.5 -0.1360 -1.4 6.1 GX 301-2 105.3539 -25.8678 0.6 37.2 104.1 3.9706 21.0 ------ UNKNOWN 38.0890 -45.4418 2.4 36.1 -0.3 0.4239 4.9 ------ UNKNOWN 93.4180 -68.3165 2.6 5.9 -84.3 0.2717 4.5 ------ UNKNOWN 335.9878 -65.8560 2.5 44.3 -60.3 1.1685 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 134.300620 483.070600 661.000000 723.068900 841.000000 887.100590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5318 -40.5858 1.4 29.0 -124.0 3.0748 8.4 1.9 Vela X-1 86.1990 5.5592 3.8 36.5 74.7 2.1427 3.1 ------ UNKNOWN 52.5797 -11.7003 2.5 51.6 23.5 6.5050 4.5 ------ UNKNOWN 71.1410 -8.9346 2.3 36.6 39.3 2.2685 4.9 ------ UNKNOWN 101.9274 -30.5979 2.7 5.6 -40.2 1.1167 4.3 ------ UNKNOWN 105.9975 -64.2773 3.6 38.4 -72.5 2.5844 3.2 ------ UNKNOWN 123.1769 -65.2857 3.4 41.0 -83.3 4.6800 3.4 ------ UNKNOWN