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 Jan 22 11:52:32 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger238174
======================================================================
Trigger: 00238174 Segment: 000
BAT Trigger Time: 184888727.104 [s; MET]
Trigger Stop: 184888731.2 [s; MET]
UTC: 2006-11-10T21:58:45.541260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.901585252738 Dec: 6.87708414719814 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.14
Image Trigger?: NO
Rate S/N Ratio: 16.3095064303001 [ if not an image trigger ]
Image S/N Ratio: 8.14
Analysis Position: [ source = BAT ]
RA: 323.901585252738 Dec: 6.87708414719814 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 323.911463636539 Dec: 6.87268728510657 [deg; J2000]
{ 21h 35m 38.8s , +06d 52' 21.7" }
+/- 1.6414889172484 [arcmin] (estimated 90% radius based on SNR)
+/- 0.56189964534397 [arcmin] (formal 1-sigma fit error)
SNR: 14.984269909139
Angular difference between the analysis and refined position is 0.644872 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 135.247999995947 +/- 17.5919828326071
Measured from: -14.6719999909401
to: 120.576000005007 [s; relative to TRIGTIME]
T50: 59.8920000195503 +/- 10.8958487411014
Measured from: 0.175999999046326
to: 60.0680000185966 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -7.85600000619888
to: -6.85600000619888 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.5040000081062
to: 132.675999999046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.376205 0.655248 0.639648 0.173502
0.053648 0.056006 0.049559 0.042655 [error]
Peak 0.015325 0.018038 0.025505 0.005339
0.004550 0.004743 0.004455 0.003746 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 149.180 -16.504 132.676
T90 135.248 -14.672 120.576
T50 59.892 0.176 60.068
Peak 1.000 -7.856 -6.856
====== 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 -1.016 -0.151 0.155 - - - 8.43e-04 -7.16e-05 7.14e-05 57.600 57
CPL -0.839 -0.309 0.624 378.049 -378.049 -378.049 1.01e-03 -2.27e-04 8.40e-04 57.310 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 -1.017 -0.373 0.394 - - - 4.02e-03 -9.06e-04 9.03e-04 50.130 57
CPL 0.070 -1.260 2.666 105.184 N/A N/A 1.26e-02 N/A N/A 48.800 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 1.02e-07 2.53e-07 5.01e-07 2.46e-06 1.35e-06 3.32e-06 erg/cm2
90%_error_low -1.77e-08 -2.67e-08 -4.69e-08 -4.98e-07 -1.22e-07 -5.25e-07 erg/cm2
90%_error_hi 1.88e-08 2.63e-08 4.65e-08 5.88e-07 1.23e-07 6.03e-07 erg/cm2
Peak flux PL 1.04e-01 1.40e-01 1.38e-01 2.46e-01 4.63e-01 6.29e-01 ph/cm2/s
90%_error_low -4.25e-02 -3.88e-02 -3.43e-02 -1.07e-01 -1.06e-01 -1.51e-01 ph/cm2/s
90%_error_hi 4.93e-02 3.79e-02 3.38e-02 1.52e-01 1.06e-01 1.62e-01 ph/cm2/s
Fluence CPL 9.78e-08 2.56e-07 5.10e-07 1.93e-06 1.34e-06 2.80e-06 erg/cm2
90%_error_low -2.24e-08 -2.80e-08 -5.37e-08 -9.86e-07 -1.30e-07 -9.83e-07 erg/cm2
90%_error_hi 1.64e-08 2.86e-08 5.59e-08 6.57e-07 1.29e-07 1.19e-06 erg/cm2
Peak flux CPL 8.00e-02 1.49e-01 1.54e-01 9.59e-02 4.43e-01 4.79e-01 ph/cm2/s
90%_error_low -5.26e-02 -4.48e-02 -4.14e-02 -9.59e-02 -1.12e-01 -1.41e-01 ph/cm2/s
90%_error_hi 5.97e-02 4.56e-02 4.44e-02 2.02e-01 1.11e-01 2.36e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 323.9115 6.8727 0.0128 15.3614 -25.2467 1.7814770 14.984 TRIG_00238174 Foreground time interval of the image: -16.504 105.197 (delta_t = 121.701 [sec]) Background time interval of the image: -239.104 -16.504 (delta_t = 222.600 [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 -16.504 sec. to 132.676 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.0164 ( -0.150811 0.154898 ) Norm@50keV : 8.42845E-04 ( -7.16296e-05 7.13715e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.60 using 59 PHA bins. # Reduced chi-squared = 1.011 for 57 degrees of freedom # Null hypothesis probability = 4.526863e-01 Photon flux (15-150 keV) in 149.2 sec: 9.71255E-02 ( -0.0084438 0.0084755 ) ph/cm2/s Energy fluence (15-150 keV) : 1.35216e-06 ( -1.22322e-07 1.23065e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.504 sec. to 132.676 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.839032 ( -0.309425 0.624286 ) Epeak [keV] : 378.049 ( -378.049 -378.049 ) Norm@50keV : 1.00959E-03 ( -0.000227436 0.000839901 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.31 using 59 PHA bins. # Reduced chi-squared = 1.023 for 56 degrees of freedom # Null hypothesis probability = 4.261556e-01 Photon flux (15-150 keV) in 149.2 sec: 9.63079E-02 ( -0.0088368 0.0088131 ) ph/cm2/s Energy fluence (15-150 keV) : 1.33958e-06 ( -1.301e-07 1.28936e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -7.856 sec. to -6.856 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.01741 ( -0.372741 0.394405 ) Norm@50keV : 4.01973E-03 ( -0.000906038 0.000903127 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.13 using 59 PHA bins. # Reduced chi-squared = 0.8795 for 57 degrees of freedom # Null hypothesis probability = 7.284068e-01 Photon flux (15-150 keV) in 1 sec: 0.463246 ( -0.105704 0.106177 ) ph/cm2/s Energy fluence (15-150 keV) : 4.32056e-08 ( -1.05212e-08 1.06921e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.856 sec. to -6.856 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0703312 ( -1.25964 2.66645 ) Epeak [keV] : 105.184 ( ) Norm@50keV : 1.26381E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.80 using 59 PHA bins. # Reduced chi-squared = 0.8715 for 56 degrees of freedom # Null hypothesis probability = 7.414508e-01 Photon flux (15-150 keV) in 1 sec: 0.442542 ( -0.111988 0.110911 ) ph/cm2/s Energy fluence (15-150 keV) : 4.04045e-08 ( -1.14117e-08 1.16274e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 2.484801929546569E-01, IMY = 1.171732314646718E-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: -239.104000 -16.504000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.7255 10.7719 24.0 49.1 -45.5 0.3586 0.5 11.3 GRS 1915+105 299.5718 35.2126 0.5 50.8 -10.9 8.2379 22.6 1.1 Cyg X-1 308.2236 40.9992 21.7 50.2 0.7 0.2015 0.5 5.8 Cyg X-3 326.0558 38.2722 2.9 41.6 16.1 1.0354 3.9 6.2 Cyg X-2 342.4915 13.8394 2.9 17.2 48.9 0.6007 4.0 ------ UNKNOWN 357.7319 -57.2298 3.5 57.5 -165.4 2.6515 3.3 ------ UNKNOWN 296.5605 -4.4317 4.7 39.7 -66.0 1.1499 2.5 ------ UNKNOWN 300.6208 -24.7240 4.3 41.1 -98.1 2.2764 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -16.504000 105.196600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.7232 10.7781 5.4 49.1 -45.5 1.0855 2.2 11.0 GRS 1915+105 299.5666 35.2261 1.2 50.8 -10.9 -2.7248 -9.7 1.9 Cyg X-1 308.1556 41.0238 3.9 50.3 0.6 0.8435 3.0 4.7 Cyg X-3 326.0372 38.2702 6.0 41.6 16.0 -0.3863 -1.9 7.0 Cyg X-2 3.5978 29.4250 2.2 41.1 65.6 2.5420 5.3 ------ UNKNOWN 0.9952 0.0213 2.0 24.8 113.2 0.9188 5.8 59.7 UNKNOWN 323.9115 6.8727 0.8 15.4 -25.2 1.7817 15.0 ------ UNKNOWN 290.3735 14.8060 2.3 48.5 -39.7 1.7162 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 250.396600 963.006000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4706 -40.5681 4.9 32.3 -161.9 0.9062 2.4 2.8 Vela X-1 170.2856 -60.7002 2.7 33.7 -106.7 2.5454 4.3 4.7 Cen X-3 186.6906 -62.7661 3.0 38.5 -95.7 5.3173 3.9 1.0 GX 301-2 67.4579 -36.3564 3.0 31.2 85.0 2.3136 3.8 ------ UNKNOWN 5.9248 -73.6540 3.1 31.6 -15.9 1.3724 3.7 ------ UNKNOWN 174.2359 -47.0567 3.0 44.8 -119.9 6.1673 3.9 ------ UNKNOWN