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 11:48:24 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger239899
======================================================================
Trigger: 00239899 Segment: 000
BAT Trigger Time: 185815350.592 [s; MET]
Trigger Stop: 185815350.848 [s; MET]
UTC: 2006-11-21T15:22:29.006780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 147.251722976049 Dec: -13.1827450313483 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 16.7928556237467 [ if not an image trigger ]
Image S/N Ratio: 8.08
Analysis Position: [ source = BAT ]
RA: 147.251722976049 Dec: -13.1827450313483 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 147.231548752313 Dec: -13.1858944746617 [deg; J2000]
{ 09h 48m 55.6s , -13d 11' 09.2" }
+/- 0.891674516758905 [arcmin] (estimated 90% radius based on SNR)
+/- 0.267208502898628 [arcmin] (formal 1-sigma fit error)
SNR: 35.8304414092398
Angular difference between the analysis and refined position is 1.193601 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 81.2159999907017 +/- 46.4024221861536
Measured from: 8.91200000047684
to: 90.1279999911785 [s; relative to TRIGTIME]
T50: 7.48000001907349 +/- 0.104000011315713
Measured from: 67.6959999799728
to: 75.1759999990463 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 74.4799999892712
to: 75.4799999892712 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.73199999332428
to: 121.415999978781 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.968763 8.086092 6.612529 1.813977
0.059111 0.063638 0.057211 0.045082 [error]
Peak 0.572442 0.930993 0.991793 0.322702
0.010824 0.013756 0.014738 0.011147 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 122.148 -0.732 121.416
T90 81.216 8.912 90.128
T50 7.480 67.696 75.176
Peak 1.000 74.480 75.480
====== 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 -1.403 -0.027 0.028 - - - 1.18e-02 -1.72e-04 1.72e-04 27.420 57
CPL -1.391 -0.042 0.055 9980.350 -9980.350 -9980.350 1.19e-02 -2.62e-04 7.42e-05 28.870 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -1.051 -0.036 0.037 - - - 1.85e-01 -3.60e-03 3.59e-03 26.340 57
CPL -1.046 -0.036 0.038 9999.130 -9999.130 -9999.130 1.85e-01 -3.34e-03 2.50e-02 26.360 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 1.68e-06 3.27e-06 4.95e-06 1.63e-05 1.39e-05 2.61e-05 erg/cm2
90%_error_low -5.54e-08 -6.32e-08 -7.41e-08 -5.87e-07 -1.93e-07 -5.99e-07 erg/cm2
90%_error_hi 5.63e-08 6.30e-08 7.40e-08 6.03e-07 1.93e-07 6.10e-07 erg/cm2
Peak flux PL 1.74e-03 2.67e-02 2.26e-01 2.69e+01 9.98e-01 2.71e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.67e-06 3.27e-06 4.93e-06 1.62e-05 1.39e-05 2.68e-05 erg/cm2
90%_error_low N/A N/A N/A N/A -2.23e-07 -1.41e-06 erg/cm2
90%_error_hi N/A N/A N/A N/A 1.62e-07 -8.06e-08 erg/cm2
Peak flux CPL 4.95e+00 6.51e+00 6.29e+00 1.08e+01 2.13e+01 2.86e+01 ph/cm2/s
90%_error_low -2.14e-01 -1.31e-01 -1.27e-01 -1.82e+00 -4.64e-01 -7.13e-01 ph/cm2/s
90%_error_hi 2.24e-01 1.68e-01 1.34e-01 6.10e-01 4.35e-01 4.83e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 147.2315 -13.1859 0.0054 8.9874 166.1694 1.1958102 35.830 TRIG_00239899 Foreground time interval of the image: -0.732 10.909 (delta_t = 11.641 [sec]) Background time interval of the image: -239.592 -0.732 (delta_t = 238.860 [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 -0.732 sec. to 121.416 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40266 ( -0.0274472 0.0275955 ) Norm@50keV : 1.17829E-02 ( -0.000172081 0.000171712 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 27.42 using 59 PHA bins. # Reduced chi-squared = 0.4810 for 57 degrees of freedom # Null hypothesis probability = 9.996839e-01 Photon flux (15-150 keV) in 122.1 sec: 1.43583 ( -0.0252 0.0253 ) ph/cm2/s Energy fluence (15-150 keV) : 1.38958e-05 ( -1.9315e-07 1.93019e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.732 sec. to 121.416 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39895 ( -0.0333846 0.0636261 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 1.18243E-02 ( -0.00017199 0.00016381 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 27.50 using 59 PHA bins. # Reduced chi-squared = 0.4910 for 56 degrees of freedom # Null hypothesis probability = 9.995159e-01 Photon flux (15-150 keV) in 122.1 sec: 1.44161 ( -0.0296 0.01849 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39234e-05 ( -2.22953e-07 1.62181e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 74.480 sec. to 75.480 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.05095 ( -0.0364354 0.0365839 ) Norm@50keV : 0.184644 ( -0.0035975 0.00359109 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 26.34 using 59 PHA bins. # Reduced chi-squared = 0.4621 for 57 degrees of freedom # Null hypothesis probability = 9.998329e-01 Photon flux (15-150 keV) in 1 sec: 0.997802 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.962e-06 ( -4.0015e-08 4.00734e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 74.480 sec. to 75.480 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.0463 ( -0.0361096 0.0376354 ) Epeak [keV] : 9999.13 ( -9999.23 -9999.23 ) Norm@50keV : 0.185453 ( -0.00356167 0.0247805 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 26.36 using 59 PHA bins. # Reduced chi-squared = 0.4708 for 56 degrees of freedom # Null hypothesis probability = 9.997458e-01 Photon flux (15-150 keV) in 1 sec: 21.3319 ( -0.4641 0.4351 ) ph/cm2/s Energy fluence (15-150 keV) : 1.96228e-06 ( -4.20202e-08 3.1375e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 81.216 sec. Hardness ratio (energy fluence ratio) = 1.51293377304
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.947633e-06 S(50-150 keV) = 8.948071e-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 = -1.535740924399797E-01, IMY = -3.780838379738825E-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: -239.592000 -0.732000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5821 -40.5667 0.9 20.3 -5.6 1.8977 12.7 2.5 Vela X-1 170.4184 -60.6006 8.1 42.5 -45.0 0.4820 1.4 3.3 Cen X-3 136.5480 16.4498 2.1 39.3 140.0 1.8275 5.5 ------ UNKNOWN 130.2930 -6.1025 2.4 21.4 108.7 0.8640 4.9 ------ UNKNOWN 146.0765 -6.9176 3.0 15.1 156.6 0.5584 3.9 ------ UNKNOWN 174.1736 19.7780 2.6 50.5 -170.6 1.5578 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.732000 10.908610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6690 -40.4445 5.1 20.2 -5.6 0.0764 2.3 9.2 Vela X-1 170.3946 -60.7551 6.4 42.6 -44.9 0.1280 1.8 8.3 Cen X-3 98.8794 -48.9855 2.4 45.3 14.8 0.3539 4.9 ------ UNKNOWN 90.7964 -58.6540 2.4 53.1 5.0 0.5787 4.8 ------ UNKNOWN 147.2315 -13.1859 0.3 9.0 166.2 1.1958 35.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 41.908580 962.499500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5214 -40.5480 0.7 29.2 -0.9 9.1819 17.1 0.5 Vela X-1 170.1608 -60.7680 9.4 50.4 -33.7 2.1019 1.2 9.8 Cen X-3 128.9277 29.6215 2.8 46.3 138.4 6.8748 4.2 ------ UNKNOWN 155.0110 24.3674 3.1 38.3 172.0 2.4643 3.7 ------ UNKNOWN 150.2676 4.7779 3.0 18.2 170.3 1.6039 3.9 ------ UNKNOWN 147.2226 -13.1932 0.2 0.0 71.6 23.3642 52.3 ------ UNKNOWN 174.2161 31.2144 2.6 51.4 -169.6 5.8811 4.4 ------ UNKNOWN 162.1672 -36.6769 3.1 27.0 -46.4 2.1198 3.7 ------ UNKNOWN 174.4315 -15.6045 4.1 26.4 -100.8 1.6903 2.8 ------ UNKNOWN