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 22:04:53 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger118707
======================================================================
Trigger: 00118707 Segment: 000
BAT Trigger Time: 137295988.032 [s; MET]
Trigger Stop: 137295989.056 [s; MET]
UTC: 2005-05-09T01:46:28.517900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 310.588276969851 Dec: 54.0700958528791 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 19.94993734326 [ if not an image trigger ]
Image S/N Ratio: 9
Analysis Position: [ source = BAT ]
RA: 310.588276969851 Dec: 54.0700958528791 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 310.573045126345 Dec: 54.0783276107505 [deg; J2000]
{ 20h 42m 17.5s , +54d 04' 42.0" }
+/- 1.27747771947577 [arcmin] (estimated 90% radius based on SNR)
+/- 0.549174574365351 [arcmin] (formal 1-sigma fit error)
SNR: 21.4380384360175
Angular difference between the analysis and refined position is 0.729027 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 10.5079999864101 +/- 2.00615055583122
Measured from: -5.59999999403954
to: 4.90799999237061 [s; relative to TRIGTIME]
T50: 4.03600001335144 +/- 0.853510373457547
Measured from: -2.79199999570847
to: 1.24400001764297 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.703999996185303
to: 1.7039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.25999999046326
to: 6.78400000929832 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.283859 0.257156 0.124190 0.029809
0.017235 0.017602 0.015142 0.012636 [error]
Peak 0.045247 0.041508 0.021862 0.006123
0.005134 0.005083 0.004391 0.003480 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 13.044 -6.260 6.784
T90 10.508 -5.600 4.908
T50 4.036 -2.792 1.244
Peak 1.000 0.704 1.704
====== 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 -2.090 -0.165 0.158 - - - 2.79e-03 -2.92e-04 2.86e-04 50.810 57
CPL -2.087 -0.170 0.155 9999.360 N/A N/A 2.80e-03 N/A N/A 50.810 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 -2.085 -0.272 0.250 - - - 5.65e-03 -1.07e-03 1.04e-03 47.990 57
CPL -1.685 -0.662 1.134 30.962 -20.543 -30.962 9.86e-03 -5.39e-03 3.94e-02 47.440 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 8.12e-08 1.04e-07 9.80e-08 1.62e-07 3.38e-07 4.46e-07 erg/cm2
90%_error_low -9.07e-09 -8.10e-09 -1.42e-08 -4.26e-08 -3.15e-08 -5.90e-08 erg/cm2
90%_error_hi 9.30e-09 8.10e-09 1.45e-08 5.21e-08 3.21e-08 6.63e-08 erg/cm2
Peak flux PL 4.09e-01 2.92e-01 1.38e-01 9.12e-02 8.82e-01 9.30e-01 ph/cm2/s
90%_error_low -7.27e-02 -3.99e-02 -3.33e-02 -3.58e-02 -1.17e-01 -1.26e-01 ph/cm2/s
90%_error_hi 7.45e-02 3.97e-02 3.45e-02 4.79e-02 1.18e-01 1.27e-01 ph/cm2/s
Fluence CPL 7.87e-08 1.05e-07 8.58e-08 1.31e-07 3.35e-07 4.16e-07 erg/cm2
90%_error_low -6.45e-09 -7.93e-09 -3.24e-09 N/A N/A -9.73e-08 erg/cm2
90%_error_hi 6.83e-09 8.23e-09 2.49e-08 N/A N/A 1.25e-07 erg/cm2
Peak flux CPL 3.99e-01 3.07e-01 1.35e-01 4.89e-02 8.72e-01 8.89e-01 ph/cm2/s
90%_error_low -7.88e-02 -4.84e-02 -4.03e-02 -4.89e-02 -1.20e-01 N/A ph/cm2/s
90%_error_hi 7.70e-02 5.37e-02 3.71e-02 8.65e-02 1.20e-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 310.5730 54.0783 0.0090 8.1649 85.9306 0.6632414 21.438 TRIG_00118707 Foreground time interval of the image: -6.260 6.784 (delta_t = 13.044 [sec]) Background time interval of the image: -299.032 -6.260 (delta_t = 292.772 [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 -6.260 sec. to 6.784 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.09007 ( -0.165362 0.157794 ) Norm@50keV : 2.79228E-03 ( -0.00029228 0.000286046 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.81 using 59 PHA bins. # Reduced chi-squared = 0.8914 for 57 degrees of freedom # Null hypothesis probability = 7.051241e-01 Photon flux (15-150 keV) in 13.04 sec: 0.437194 ( -0.033707 0.033731 ) ph/cm2/s Energy fluence (15-150 keV) : 3.38048e-07 ( -3.1472e-08 3.21107e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.260 sec. to 6.784 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.08701 ( -0.168623 0.156148 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 2.79740E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.81 using 59 PHA bins. # Reduced chi-squared = 0.9073 for 56 degrees of freedom # Null hypothesis probability = 6.710787e-01 Photon flux (15-150 keV) in 13.04 sec: 0.436684 ( -0.033506 0.03554 ) ph/cm2/s Energy fluence (15-150 keV) : 3.34733e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.704 sec. to 1.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.08486 ( -0.272455 0.250412 ) Norm@50keV : 5.65023E-03 ( -0.00106696 0.00103645 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.99 using 59 PHA bins. # Reduced chi-squared = 0.8419 for 57 degrees of freedom # Null hypothesis probability = 7.966221e-01 Photon flux (15-150 keV) in 1 sec: 0.882416 ( -0.117499 0.1175 ) ph/cm2/s Energy fluence (15-150 keV) : 5.24324e-08 ( -8.78383e-09 9.08529e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.704 sec. to 1.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.68484 ( -0.662185 1.13447 ) Epeak [keV] : 30.9615 ( -20.5412 -30.9595 ) Norm@50keV : 9.86477E-03 ( -0.00538373 0.0394293 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.44 using 59 PHA bins. # Reduced chi-squared = 0.8472 for 56 degrees of freedom # Null hypothesis probability = 7.852696e-01 Photon flux (15-150 keV) in 1 sec: 0.871766 ( -0.119602 0.119817 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 10.508 sec. Hardness ratio (energy fluence ratio) = 0.939528612621
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.854805e-07 S(50-150 keV) = 1.5256475e-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 = 1.018196477192660E-02, IMY = -1.431157912779417E-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: -299.032000 -6.260000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5932 35.1993 0.3 26.7 52.1 8.3375 33.2 0.2 Cyg X-1 308.1075 40.9515 0.9 18.3 44.8 2.5162 13.0 0.1 Cyg X-3 326.3132 38.4733 4.7 17.3 -2.7 0.5385 2.5 11.3 Cyg X-2 308.0940 37.6833 1.8 21.2 40.3 1.3122 6.4 ------ UNKNOWN 331.7566 65.5324 2.3 10.4 -161.1 0.9148 4.9 ------ UNKNOWN 121.1434 63.9090 3.3 59.0 -166.2 5.4571 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.260000 6.784000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.3855 35.2252 5.9 26.7 52.4 0.0831 1.9 10.1 Cyg X-1 308.1228 40.9478 284.2 18.3 44.8 -0.0014 -0.0 0.6 Cyg X-3 326.2207 38.2591 3.8 17.5 -2.4 0.0916 3.0 4.4 Cyg X-2 314.7745 33.9426 2.4 22.8 23.2 0.1585 4.8 ------ UNKNOWN 310.5731 54.0783 0.5 8.2 85.9 0.6632 21.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 38.668600 123.043200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.6947 11.0164 4.4 46.4 45.1 0.9966 2.6 7.4 GRS 1915+105 299.5916 35.1956 0.4 20.4 41.4 2.4741 28.5 0.4 Cyg X-1 308.1380 40.9846 1.3 13.2 23.0 0.7257 8.8 2.3 Cyg X-3 326.0859 38.2898 13.5 19.0 -25.4 0.0725 0.8 4.5 Cyg X-2 277.6394 54.4156 2.2 19.1 119.2 0.4839 5.2 ------ UNKNOWN 308.0495 37.6580 2.4 16.5 21.9 0.3965 4.8 ------ UNKNOWN 338.7310 62.8760 2.3 16.9 -117.8 0.4213 5.0 ------ UNKNOWN 126.0429 66.5020 2.9 59.4 -163.2 2.5790 4.0 ------ UNKNOWN 34.0792 58.1251 2.6 43.7 -115.9 1.5274 4.4 ------ UNKNOWN 38.8469 59.8452 2.4 44.8 -119.9 1.6249 4.9 ------ UNKNOWN 65.4207 64.9324 2.7 51.0 -135.6 2.0357 4.3 ------ UNKNOWN