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: Thu Sep 11 10:51:20 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger442978
======================================================================
Trigger: 00442978 Segment: 000
BAT Trigger Time: 317168464.96 [s; MET]
Trigger Stop: 317168465.472 [s; MET]
UTC: 2011-01-19T22:20:58.379640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.557715071903 Dec: 5.98467449193536 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.81
Image Trigger?: NO
Rate S/N Ratio: 17.7200451466693 [ if not an image trigger ]
Image S/N Ratio: 8.81
Analysis Position: [ source = BAT ]
RA: 348.557715071903 Dec: 5.98467449193536 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 348.583306661186 Dec: 5.98619858350469 [deg; J2000]
{ 23h 14m 20.0s , +05d 59' 10.3" }
+/- 1.41145899573219 [arcmin] (estimated 90% radius based on SNR)
+/- 0.78483923608285 [arcmin] (formal 1-sigma fit error)
SNR: 18.5911635490776
Angular difference between the analysis and refined position is 1.529860 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 213.927999973297 +/- 10.2112424279342
Measured from: -6.31999999284744
to: 207.60799998045 [s; relative to TRIGTIME]
T50: 130.031999945641 +/- 20.3402942438896
Measured from: 19.1759999990463
to: 149.207999944687 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.160000026226
to: 34.160000026226 [s; relative to TRIGTIME]
Total Fluence
Measured from: -86.2599999904633
to: 239.708000004292 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.227757 4.469751 3.379688 0.942418
0.090329 0.094117 0.085409 0.077582 [error]
Peak 0.056129 0.093442 0.110855 0.045345
0.005649 0.006373 0.006490 0.005147 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 325.968 -86.260 239.708
T90 213.928 -6.320 207.608
T50 130.032 19.176 149.208
Peak 1.000 33.160 34.160
====== 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 -1.477 -0.053 0.053 - - - 2.34e-03 -6.28e-05 6.28e-05 50.720 57
CPL -1.382 -0.125 0.209 347.406 -347.406 -347.406 2.59e-03 -3.00e-04 6.38e-04 50.090 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 -0.896 -0.116 0.118 - - - 1.93e-02 -1.27e-03 1.27e-03 63.870 57
CPL -0.841 -0.159 0.458 998.492 -998.492 -998.492 2.07e-02 -2.34e-03 1.10e-02 63.850 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 9.54e-07 1.78e-06 2.55e-06 7.77e-06 7.27e-06 1.31e-05 erg/cm2
90%_error_low -5.10e-08 -5.44e-08 -8.78e-08 -6.02e-07 -2.11e-07 -6.52e-07 erg/cm2
90%_error_hi 5.21e-08 5.43e-08 8.75e-08 6.38e-07 2.11e-07 6.82e-07 erg/cm2
Peak flux PL 4.47e-01 6.46e-01 6.94e-01 1.39e+00 2.22e+00 3.18e+00 ph/cm2/s
90%_error_low -6.04e-02 -5.40e-02 -4.90e-02 -2.06e-01 -1.46e-01 -2.38e-01 ph/cm2/s
90%_error_hi 6.34e-02 5.34e-02 4.87e-02 2.29e-01 1.46e-01 2.46e-01 ph/cm2/s
Fluence CPL 9.33e-07 1.79e-06 2.57e-06 6.75e-06 7.21e-06 1.20e-05 erg/cm2
90%_error_low -6.57e-08 -5.86e-08 -9.38e-08 -1.70e-06 -2.44e-07 -1.71e-06 erg/cm2
90%_error_hi 5.88e-08 5.92e-08 9.46e-08 8.01e-07 2.42e-07 1.23e-06 erg/cm2
Peak flux CPL 4.39e-01 6.51e-01 7.03e-01 1.38e+00 2.21e+00 3.09e+00 ph/cm2/s
90%_error_low -7.63e-02 -5.46e-02 -5.72e-02 -5.80e-01 -1.51e-01 -4.95e-01 ph/cm2/s
90%_error_hi 5.82e-02 5.30e-02 5.79e-02 1.55e-01 1.47e-01 3.11e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 348.5833 5.9862 0.0104 10.0018 -119.7654 2.0383631 18.591 TRIG_00442978 Foreground time interval of the image: -86.260 11.141 (delta_t = 97.401 [sec]) Background time interval of the image: -239.960 -86.260 (delta_t = 153.700 [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 -86.260 sec. to 239.708 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4771 ( -0.052583 0.0525543 ) Norm@50keV : 2.34078E-03 ( -6.27817e-05 6.27612e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.72 using 59 PHA bins. # Reduced chi-squared = 0.8899 for 57 degrees of freedom # Null hypothesis probability = 7.080570e-01 Photon flux (15-150 keV) in 326 sec: 0.290466 ( -0.008425 0.008448 ) ph/cm2/s Energy fluence (15-150 keV) : 7.26788e-06 ( -2.10592e-07 2.11366e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -86.260 sec. to 239.708 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38241 ( -0.124616 0.209352 ) Epeak [keV] : 347.406 ( -347.458 -347.458 ) Norm@50keV : 2.59298E-03 ( -0.000299739 0.000638449 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.09 using 59 PHA bins. # Reduced chi-squared = 0.8944 for 56 degrees of freedom # Null hypothesis probability = 6.970847e-01 Photon flux (15-150 keV) in 326 sec: 0.288353 ( -0.009478 0.009479 ) ph/cm2/s Energy fluence (15-150 keV) : 7.20988e-06 ( -2.43975e-07 2.42029e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 33.160 sec. to 34.160 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.895547 ( -0.115654 0.117749 ) Norm@50keV : 1.93111E-02 ( -0.00127135 0.00126788 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.87 using 59 PHA bins. # Reduced chi-squared = 1.121 for 57 degrees of freedom # Null hypothesis probability = 2.479031e-01 Photon flux (15-150 keV) in 1 sec: 2.21639 ( -0.14597 0.14613 ) ph/cm2/s Energy fluence (15-150 keV) : 2.17125e-07 ( -1.56598e-08 1.5727e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.160 sec. to 34.160 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.827652 ( -0.158652 0.457671 ) Epeak [keV] : 999.760 ( -999.268 -999.268 ) Norm@50keV : 2.06869E-02 ( -0.00232368 0.0110568 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.81 using 59 PHA bins. # Reduced chi-squared = 1.140 for 56 degrees of freedom # Null hypothesis probability = 2.209818e-01 Photon flux (15-150 keV) in 1 sec: 2.21274 ( -0.15146 0.14704 ) ph/cm2/s Energy fluence (15-150 keV) : 2.44045e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 213.928 sec. Hardness ratio (energy fluence ratio) = 1.43687864485
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.7308548e-06 S(50-150 keV) = 4.537094e-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 = -8.755345310674198E-02, IMY = 1.530911219523165E-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: -239.960000 -86.260000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6151 35.1837 2.9 50.5 -15.6 1.2204 4.0 1.6 Cyg X-1 308.0714 40.9569 2.5 45.5 -5.8 1.1753 4.5 1.8 Cyg X-3 325.9567 38.2886 3.3 32.2 1.3 0.5810 3.5 10.3 Cyg X-2 348.9831 52.7371 2.7 37.3 38.4 1.2027 4.2 ------ UNKNOWN 328.6939 42.2884 3.3 33.4 9.3 0.5694 3.5 ------ UNKNOWN 335.1062 -10.7007 2.2 31.0 -105.4 1.0631 5.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -86.260000 11.140600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.7099 35.2580 12.1 50.4 -15.5 -0.2715 -1.0 6.8 Cyg X-1 308.1128 41.0725 9.3 45.6 -5.7 -0.2933 -1.2 7.2 Cyg X-3 326.2206 38.4512 8.3 32.2 1.7 0.2031 1.4 8.1 Cyg X-2 348.5832 5.9862 0.6 10.0 -119.8 2.0387 18.6 ------ UNKNOWN 303.2187 33.3498 2.8 47.3 -17.4 1.0317 4.1 ------ UNKNOWN 359.2273 -32.1079 2.4 48.1 -147.2 1.3332 4.8 ------ UNKNOWN 325.4373 -15.7449 1.8 40.7 -97.7 3.1098 6.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 45.740610 722.076800 780.040000 842.200000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5482 35.1798 3.1 53.6 -18.8 3.4177 3.7 2.4 Cyg X-1 308.1667 40.9602 3.2 50.2 -8.4 3.0321 3.6 2.6 Cyg X-3 326.3099 38.3358 3.8 38.1 2.4 1.6044 3.1 6.6 Cyg X-2 348.5803 5.9845 0.5 0.0 156.3 6.8794 21.5 ------ UNKNOWN 335.4330 -0.8778 3.1 14.8 -86.0 1.1469 3.7 ------ UNKNOWN 14.8857 -47.9707 3.4 58.7 -169.1 6.8478 3.4 ------ UNKNOWN 341.2761 -47.0038 2.8 53.4 -142.6 8.7452 4.1 ------ UNKNOWN 311.0722 -11.0903 3.0 41.0 -83.3 6.2568 3.8 ------ UNKNOWN