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 18:22:38 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger191157
======================================================================
Trigger: 00191157 Segment: 000
BAT Trigger Time: 161926472 [s; MET]
Trigger Stop: 161926552 [s; MET]
UTC: 2006-02-18T03:34:30.977720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 50.4036197387777 Dec: 16.8660799646394 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.84
Analysis Position: [ source = BAT ]
RA: 50.4036197387777 Dec: 16.8660799646394 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 50.3837678142484 Dec: 16.910773911215 [deg; J2000]
{ 03h 21m 32.1s , +16d 54' 38.8" }
+/- 2.59439650263142 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23793325682839 [arcmin] (formal 1-sigma fit error)
SNR: 7.79180149163257
Angular difference between the analysis and refined position is 2.913794 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: N/A +/- N/A
Measured from: N/A
to: N/A [s; relative to TRIGTIME]
T50: N/A +/- N/A
Measured from: N/A
to: N/A [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 N/A N/A N/A
T90 N/A N/A N/A
T50 N/A N/A N/A
Peak N/A N/A N/A
====== 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 -2.184 -0.197 0.185 - - - 5.12e-04 -6.89e-05 6.76e-05 66.240 57
CPL -1.654 -0.359 0.963 25.298 -24.825 15.489 1.07e-03 -6.79e-04 3.02e-03 65.010 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 N/A N/A N/A - - - N/A N/A N/A N/A N/A
CPL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
=== 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 4.49e-07 5.45e-07 4.80e-07 7.26e-07 1.73e-06 2.20e-06 erg/cm2
90%_error_low -5.52e-08 -5.25e-08 -8.74e-08 -2.29e-07 -1.97e-07 -3.43e-07 erg/cm2
90%_error_hi 5.62e-08 5.21e-08 9.07e-08 2.92e-07 2.03e-07 3.92e-07 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A 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 50.3838 16.9108 0.0245 24.9852 178.4255 0.7140213 7.792 TRIG_00191157 Foreground time interval of the image: 0.000 80.000 (delta_t = 80.000 [sec]) Background time interval of the image:
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 -56.596 sec. to 303.040 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.18401 ( -0.197462 0.185484 ) Norm@50keV : 5.11912E-04 ( -6.8945e-05 6.76089e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.24 using 59 PHA bins. # Reduced chi-squared = 1.162 for 57 degrees of freedom # Null hypothesis probability = 1.882865e-01 Photon flux (15-150 keV) in 359.6 sec: 8.40508E-02 ( -0.007665 0.0076652 ) ph/cm2/s Energy fluence (15-150 keV) : 1.72731e-06 ( -1.97313e-07 2.03149e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -56.596 sec. to 303.040 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65352 ( -0.358545 0.962609 ) Epeak [keV] : 25.2979 ( -24.8252 15.4888 ) Norm@50keV : 1.06935E-03 ( -0.000679132 0.00302387 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.01 using 59 PHA bins. # Reduced chi-squared = 1.161 for 56 degrees of freedom # Null hypothesis probability = 1.915926e-01 Photon flux (15-150 keV) in 359.6 sec: 8.21955E-02 ( -0.0081085 0.0081386 ) ph/cm2/s Energy fluence (15-150 keV) : 1.6223e-06 ( -2.28659e-07 2.54252e-07 ) ergs/cm2
1-s peak spectrum fit
1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.
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 = -4.658171215831947E-01, IMY = -1.280434502440065E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 80.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6470 21.9770 4.2 43.9 130.9 0.8768 2.7 2.4 Crab 326.0351 38.4842 6.0 53.2 -33.3 -0.7650 -1.9 11.7 Cyg X-2 63.0813 54.8117 2.4 24.6 72.5 0.5134 4.8 ------ UNKNOWN 50.3837 16.9108 1.5 25.0 178.4 0.7141 7.8 ------ UNKNOWN 311.7105 60.8267 2.1 54.4 -3.4 1.4924 5.5 ------ UNKNOWN 332.0291 58.3877 2.7 44.7 -8.7 0.5925 4.2 ------ UNKNOWN 51.4677 -1.6407 2.3 42.6 -170.3 0.6322 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 137.100600 303.040000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6415 22.0206 0.5 31.7 89.8 6.5229 23.4 0.6 Crab 51.3826 64.0440 2.5 47.2 15.1 1.6336 4.6 ------ UNKNOWN 50.4194 16.8297 0.8 0.1 168.6 1.9274 14.3 ------ UNKNOWN 48.5057 10.5720 2.7 6.6 -149.0 0.5423 4.3 ------ UNKNOWN 30.9516 -4.1498 2.6 28.5 -121.3 0.7760 4.4 ------ UNKNOWN 0.6588 27.5529 3.0 46.9 -53.2 2.4632 3.8 ------ UNKNOWN